Added modules and implementation for AINV solver

amgprec/Makefile

@@ -13,7 +13,8 @@ DMODOBJS=amg_d_prec_type.o \
 	amg_d_base_solver_mod.o amg_d_base_smoother_mod.o amg_d_onelev_mod.o \
 	amg_d_gs_solver.o amg_d_mumps_solver.o \
 	amg_d_base_aggregator_mod.o \
-	amg_d_dec_aggregator_mod.o amg_d_symdec_aggregator_mod.o
+	amg_d_dec_aggregator_mod.o amg_d_symdec_aggregator_mod.o \
+	amg_d_ainv_solver.o amg_d_base_ainv_mod.o
 #amg_d_bcmatch_aggregator_mod.o
 
 SMODOBJS=amg_s_prec_type.o amg_s_ilu_fact_mod.o \
@@ -22,7 +23,8 @@ SMODOBJS=amg_s_prec_type.o amg_s_ilu_fact_mod.o \
 	amg_s_base_solver_mod.o amg_s_base_smoother_mod.o amg_s_onelev_mod.o  \
 	amg_s_gs_solver.o amg_s_mumps_solver.o \
 	amg_s_base_aggregator_mod.o  \
-	amg_s_dec_aggregator_mod.o amg_s_symdec_aggregator_mod.o
+	amg_s_dec_aggregator_mod.o amg_s_symdec_aggregator_mod.o \
+	amg_s_ainv_solver.o amg_s_base_ainv_mod.o
 
 ZMODOBJS=amg_z_prec_type.o amg_z_ilu_fact_mod.o \
 	amg_z_inner_mod.o amg_z_ilu_solver.o amg_z_diag_solver.o amg_z_jac_smoother.o amg_z_as_smoother.o \
@@ -30,7 +32,8 @@ ZMODOBJS=amg_z_prec_type.o amg_z_ilu_fact_mod.o \
 	amg_z_base_solver_mod.o amg_z_base_smoother_mod.o amg_z_onelev_mod.o \
 	amg_z_gs_solver.o amg_z_mumps_solver.o \
 	amg_z_base_aggregator_mod.o  \
-	amg_z_dec_aggregator_mod.o amg_z_symdec_aggregator_mod.o
+	amg_z_dec_aggregator_mod.o amg_z_symdec_aggregator_mod.o \
+	amg_z_ainv_solver.o amg_z_base_ainv_mod.o
 
 CMODOBJS=amg_c_prec_type.o amg_c_ilu_fact_mod.o \
 	amg_c_inner_mod.o amg_c_ilu_solver.o amg_c_diag_solver.o amg_c_jac_smoother.o amg_c_as_smoother.o \
@@ -38,12 +41,14 @@ CMODOBJS=amg_c_prec_type.o amg_c_ilu_fact_mod.o \
 	amg_c_base_solver_mod.o amg_c_base_smoother_mod.o amg_c_onelev_mod.o  \
 	amg_c_gs_solver.o amg_c_mumps_solver.o \
 	amg_c_base_aggregator_mod.o  \
-	amg_c_dec_aggregator_mod.o amg_c_symdec_aggregator_mod.o
+	amg_c_dec_aggregator_mod.o amg_c_symdec_aggregator_mod.o \
+	amg_c_ainv_solver.o amg_c_base_ainv_mod.o
 
 
 
 MODOBJS=amg_base_prec_type.o amg_prec_type.o  amg_prec_mod.o \
 	 amg_s_prec_mod.o  amg_d_prec_mod.o amg_c_prec_mod.o amg_z_prec_mod.o \
+	 amg_base_ainv_mod.o \
 	$(SMODOBJS) $(DMODOBJS) $(CMODOBJS) $(ZMODOBJS)
 
 
@@ -163,7 +168,12 @@ amg_cprecinit.o amg_cprecset.o: amg_c_diag_solver.o amg_c_ilu_solver.o \
 		amg_c_as_smoother.o amg_c_jac_smoother.o \
 	        amg_c_id_solver.o amg_c_slu_solver.o amg_c_sludist_solver.o
 
-
+amg_base_ainv_mod.o: amg_base_prec_type.o
+amg_s_base_ainv_mod.o amg_d_base_ainv_mod.o amg_c_base_ainv_mod.o amg_z_base_ainv_mod.o: amg_base_ainv_mod.o
+amg_s_ainv_solver.o: amg_base_ainv_mod.o amg_s_base_ainv_mod.o
+amg_d_ainv_solver.o: amg_base_ainv_mod.o amg_d_base_ainv_mod.o
+amg_c_ainv_solver.o: amg_base_ainv_mod.o amg_c_base_ainv_mod.o
+amg_z_ainv_solver.o: amg_base_ainv_mod.o amg_z_base_ainv_mod.o
 
 veryclean: clean
 	/bin/rm -f $(LIBNAME)

amgprec/amg_base_ainv_mod.F90

@@ -0,0 +1,63 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+!
+module amg_base_ainv_mod
+
+  use amg_base_prec_type
+
+  integer, parameter   :: amg_inv_fillin_ = amg_ifpsz_ + 1
+  integer, parameter   :: amg_ainv_alg_   = amg_inv_fillin_ + 1
+  integer, parameter   :: amg_inv_thresh_ = amg_max_sub_solve_ + 1
+#if 0
+  integer, parameter   :: amg_ainv_orth1_ = amg_inv_thresh_ + 1
+  integer, parameter   :: amg_ainv_orth2_ = amg_ainv_orth1_ + 1
+  integer, parameter   :: amg_ainv_orth3_ = amg_ainv_orth2_ + 1
+  integer, parameter   :: amg_ainv_orth4_ = amg_ainv_orth3_ + 1
+  integer, parameter   :: amg_ainv_llk_   = amg_ainv_orth4_ + 1
+#else
+  integer, parameter   :: amg_ainv_llk_   = amg_inv_thresh_ + 1
+#endif
+  integer, parameter   :: amg_ainv_s_llk_ = amg_ainv_llk_ + 1
+  integer, parameter   :: amg_ainv_s_ft_llk_ = amg_ainv_s_llk_ + 1
+  integer, parameter   :: amg_ainv_llk_noth_ = amg_ainv_s_ft_llk_  + 1
+  integer, parameter   :: amg_ainv_mlk_      = amg_ainv_llk_noth_  + 1
+  integer, parameter   :: amg_ainv_lmx_      = amg_ainv_mlk_
+#if defined(HAVE_TUMA_SAINV)
+  integer, parameter   :: amg_ainv_s_tuma_    = amg_ainv_lmx_  + 1
+  integer, parameter   :: amg_ainv_l_tuma_    = amg_ainv_s_tuma_  + 1
+#endif
+
+
+end module amg_base_ainv_mod

amgprec/amg_c_ainv_solver.F90

@@ -0,0 +1,322 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+!
+!
+!
+!
+!
+module amg_c_ainv_solver
+
+  use amg_c_prec_type
+  use amg_c_base_ainv_mod
+  use psb_base_mod, only : psb_d_vect_type
+
+  type, extends(amg_c_base_ainv_solver_type) :: amg_c_ainv_solver_type
+    !
+    !  Compute an approximate factorization
+    !      A^-1 = Z D^-1 W^T
+    !  Note that here W is going to be transposed explicitly,
+    !  so that the component w will in the end contain W^T.
+    !
+    integer(psb_ipk_)   :: alg, fill_in
+    real(psb_spk_)      :: thresh
+  contains
+    procedure, pass(sv) :: check   => amg_c_ainv_solver_check
+    procedure, pass(sv) :: build   => amg_c_ainv_solver_bld
+    procedure, pass(sv) :: clone   => amg_c_ainv_solver_clone
+    procedure, pass(sv) :: cseti   => amg_c_ainv_solver_cseti
+    procedure, pass(sv) :: csetc   => amg_c_ainv_solver_csetc
+    procedure, pass(sv) :: csetr   => amg_c_ainv_solver_csetr
+    procedure, pass(sv) :: seti    => amg_c_ainv_solver_seti
+    procedure, pass(sv) :: setc    => amg_c_ainv_solver_setc
+    procedure, pass(sv) :: setr    => amg_c_ainv_solver_setr
+    generic, public :: set => seti, setr, setc
+    procedure, pass(sv) :: descr   => amg_c_ainv_solver_descr
+    procedure, pass(sv) :: default => c_ainv_solver_default
+    procedure, nopass   :: stringval  => c_ainv_stringval
+    procedure, nopass   :: algname => c_ainv_algname
+  end type amg_c_ainv_solver_type
+
+
+  private :: c_ainv_stringval, c_ainv_solver_default, &
+       &  c_ainv_algname
+
+  interface
+    subroutine amg_c_ainv_solver_clone(sv,svout,info)
+      import :: psb_desc_type, psb_cspmat_type,  psb_c_base_sparse_mat, &
+       & amg_c_base_solver_type, psb_dpk_, amg_c_ainv_solver_type, psb_ipk_
+      Implicit None
+      class(amg_c_ainv_solver_type), intent(inout)              :: sv
+      class(amg_c_base_solver_type), allocatable, intent(inout) :: svout
+      integer(psb_ipk_), intent(out)                            :: info
+    end subroutine amg_c_ainv_solver_clone
+  end interface
+
+
+  interface
+    subroutine amg_c_ainv_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
+      import :: psb_desc_type, psb_cspmat_type,  psb_c_base_sparse_mat, &
+       & psb_d_vect_type, psb_c_base_vect_type, psb_dpk_,&
+       & amg_c_ainv_solver_type, psb_i_base_vect_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      type(psb_cspmat_type), intent(in), target           :: a
+      Type(psb_desc_type), Intent(inout)                  :: desc_a
+      class(amg_c_ainv_solver_type), intent(inout)        :: sv
+      integer(psb_ipk_), intent(out)                      :: info
+      type(psb_cspmat_type), intent(in), target, optional :: b
+      class(psb_c_base_sparse_mat), intent(in), optional  :: amold
+      class(psb_c_base_vect_type), intent(in), optional   :: vmold
+      class(psb_i_base_vect_type), intent(in), optional   :: imold
+    end subroutine amg_c_ainv_solver_bld
+  end interface
+
+  interface
+    subroutine amg_c_ainv_solver_check(sv,info)
+      import :: psb_dpk_, amg_c_ainv_solver_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      class(amg_c_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_c_ainv_solver_check
+  end interface
+
+  interface
+    subroutine amg_c_ainv_solver_cseti(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_cspmat_type,  psb_c_base_sparse_mat, psb_ipk_,&
+           & psb_d_vect_type, psb_c_base_vect_type, psb_dpk_, amg_c_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_c_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      integer(psb_ipk_), intent(in)                :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_c_ainv_solver_cseti
+  end interface
+
+
+  interface
+    subroutine amg_c_ainv_solver_csetc(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_cspmat_type,  psb_c_base_sparse_mat, psb_ipk_,&
+           & psb_d_vect_type, psb_c_base_vect_type, psb_dpk_, amg_c_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_c_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      character(len=*), intent(in)                 :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_c_ainv_solver_csetc
+  end interface
+
+  interface
+    subroutine amg_c_ainv_solver_csetr(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_cspmat_type,  psb_c_base_sparse_mat,  psb_ipk_,&
+           & psb_d_vect_type, psb_c_base_vect_type, psb_spk_, amg_c_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_c_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      real(psb_spk_), intent(in)                   :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_c_ainv_solver_csetr
+  end interface
+
+  interface
+    subroutine amg_c_ainv_solver_setc(sv,what,val,info)
+      import :: amg_c_ainv_solver_type, psb_ipk_
+      Implicit none
+      ! Arguments
+      class(amg_c_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      character(len=*), intent(in)                 :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_c_ainv_solver_setc
+  end interface
+
+  interface
+    subroutine amg_c_ainv_solver_seti(sv,what,val,info)
+      import :: amg_c_ainv_solver_type, psb_ipk_
+      Implicit none
+      ! Arguments
+      class(amg_c_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      integer(psb_ipk_), intent(in)                :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_c_ainv_solver_seti
+  end interface
+
+  interface
+    subroutine amg_c_ainv_solver_setr(sv,what,val,info)
+      import :: amg_c_ainv_solver_type, psb_ipk_, psb_spk_
+      Implicit none
+      ! Arguments
+      class(amg_c_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      real(psb_spk_), intent(in)                   :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_c_ainv_solver_setr
+  end interface
+
+  interface
+    subroutine amg_c_ainv_solver_descr(sv,info,iout,coarse)
+      import :: psb_dpk_, amg_c_ainv_solver_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      class(amg_c_ainv_solver_type), intent(in) :: sv
+      integer(psb_ipk_), intent(out)            :: info
+      integer(psb_ipk_), intent(in), optional   :: iout
+      logical, intent(in), optional             :: coarse
+
+    end subroutine amg_c_ainv_solver_descr
+  end interface
+
+  interface  amg_ainv_bld
+    subroutine amg_c_ainv_bld(a,alg,fillin,thresh,wmat,d,zmat,desc,info,blck,iscale)
+      import :: psb_desc_type, psb_cspmat_type,  psb_c_base_sparse_mat, &
+           & psb_d_vect_type, psb_c_base_vect_type, psb_spk_, psb_ipk_
+      implicit none
+      type(psb_cspmat_type), intent(in), target   :: a
+      integer(psb_ipk_), intent(in)               :: fillin,alg
+      real(psb_spk_), intent(in)                  :: thresh
+      type(psb_cspmat_type), intent(inout)        :: wmat, zmat
+      complex(psb_spk_), allocatable                 :: d(:)
+      Type(psb_desc_type), Intent(inout)          :: desc
+      integer(psb_ipk_), intent(out)              :: info
+      type(psb_cspmat_type), intent(in), optional :: blck
+      integer(psb_ipk_), intent(in), optional     :: iscale
+    end subroutine amg_c_ainv_bld
+  end interface
+
+
+contains
+
+  subroutine c_ainv_solver_default(sv)
+
+    use psb_base_mod
+
+    Implicit None
+
+    ! Arguments
+    class(amg_c_ainv_solver_type), intent(inout) :: sv
+
+    sv%alg     = amg_ainv_llk_
+    sv%fill_in = 0
+    sv%thresh  = dzero
+
+    return
+  end subroutine c_ainv_solver_default
+
+  function is_positive_nz_min(ip) result(res)
+    implicit none
+    integer(psb_ipk_), intent(in) :: ip
+    logical             :: res
+
+    res = (ip >= 1)
+    return
+  end function is_positive_nz_min
+
+
+  function c_ainv_stringval(string) result(val)
+    use psb_base_mod, only : psb_ipk_,psb_toupper
+    implicit none
+  ! Arguments
+    character(len=*), intent(in) :: string
+    integer(psb_ipk_) :: val
+    character(len=*), parameter :: name='d_ainv_stringval'
+
+    select case(psb_toupper(trim(string)))
+    case('LLK')
+      val = amg_ainv_llk_
+    case('STAB-LLK')
+      val = amg_ainv_s_ft_llk_
+    case('SYM-LLK')
+      val = amg_ainv_s_llk_
+    case('MLK')
+      val = amg_ainv_mlk_
+#if defined(HAVE_TUMA_SAINV)
+    case('SAINV-TUMA')
+      val = amg_ainv_s_tuma_
+    case('LAINV-TUMA')
+      val = amg_ainv_l_tuma_
+#endif
+    case default
+      val  = amg_stringval(string)
+    end select
+  end function c_ainv_stringval
+
+
+  function c_ainv_algname(ialg) result(val)
+    integer(psb_ipk_), intent(in) :: ialg
+    character(len=40) :: val
+
+    character(len=*), parameter :: mlkname   = 'Left-looking, list merge '
+    character(len=*), parameter :: llkname   = 'Left-looking '
+    character(len=*), parameter :: stabllkname  = 'Stabilized Left-looking '
+    character(len=*), parameter :: sllkname  = 'Symmetric Left-looking '
+    character(len=*), parameter :: sainvname = 'SAINV (Benzi & Tuma) '
+    character(len=*), parameter :: lainvname = 'LAINV (Benzi & Tuma) '
+    character(len=*), parameter :: defname   = 'Unknown alg variant '
+
+    select case (ialg)
+    case(amg_ainv_mlk_)
+      val = mlkname
+    case(amg_ainv_llk_)
+      val = llkname
+    case(amg_ainv_s_llk_)
+      val = sllkname
+    case(amg_ainv_s_ft_llk_)
+      val = stabllkname
+#if defined(HAVE_TUMA_SAINV)
+    case(amg_ainv_s_tuma_ )
+      val = sainvname
+    case(amg_ainv_l_tuma_ )
+      val = lainvname
+#endif
+    case default
+      val = defname
+    end select
+
+  end function c_ainv_algname
+
+end module amg_c_ainv_solver

amgprec/amg_c_base_ainv_mod.f90

@@ -0,0 +1,199 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+!
+module amg_c_base_ainv_mod
+
+  use amg_base_ainv_mod
+  use amg_c_prec_type
+  use psb_c_ainv_tools_mod
+  use psb_base_mod, only : psb_c_vect_type, psb_spk_, psb_epk_
+
+
+
+  type, extends(amg_c_base_solver_type) :: amg_c_base_ainv_solver_type
+    !
+    !  Compute an approximate factorization
+    !      A^-1 = Z D^-1 W^T
+    !  Note that here W is going to be transposed explicitly,
+    !  so that the component w will in the end contain W^T.
+    !
+    type(psb_cspmat_type)       :: w, z
+    type(psb_c_vect_type)       :: dv
+    complex(psb_spk_), allocatable :: d(:)
+
+  contains
+    procedure, pass(sv) :: cnv     => amg_c_base_ainv_solver_cnv
+    procedure, pass(sv) :: dump    => amg_c_base_ainv_solver_dmp
+    procedure, pass(sv) :: apply_v => amg_c_base_ainv_solver_apply_vect
+    procedure, pass(sv) :: apply_a => amg_c_base_ainv_solver_apply
+    procedure, pass(sv) :: free    => amg_c_base_ainv_solver_free
+    procedure, pass(sv) :: sizeof  => c_base_ainv_solver_sizeof
+    procedure, pass(sv) :: get_nzeros => c_base_ainv_get_nzeros
+    procedure, nopass   :: get_wrksz => c_base_ainv_get_wrksize
+    procedure, pass(sv) :: update_a => amg_c_base_ainv_update_a
+    generic, public     :: update => update_a
+  end type amg_c_base_ainv_solver_type
+
+  private ::  c_base_ainv_solver_sizeof, &
+       & c_base_ainv_get_nzeros, c_base_ainv_get_wrksize
+
+
+  interface
+    subroutine amg_c_base_ainv_solver_cnv(sv,info,amold,vmold,imold)
+      import :: psb_c_base_sparse_mat, psb_c_base_vect_type, psb_spk_, &
+       & amg_c_base_ainv_solver_type, psb_ipk_, psb_i_base_vect_type
+      Implicit None
+      ! Arguments
+      class(amg_c_base_ainv_solver_type), intent(inout)  :: sv
+      integer(psb_ipk_), intent(out)                     :: info
+      class(psb_c_base_sparse_mat), intent(in), optional :: amold
+      class(psb_c_base_vect_type), intent(in), optional  :: vmold
+      class(psb_i_base_vect_type), intent(in), optional  :: imold
+    end subroutine amg_c_base_ainv_solver_cnv
+  end interface
+
+  interface
+    subroutine amg_c_base_ainv_update_a(sv,x,desc_data,info)
+      import :: psb_desc_type, psb_spk_,amg_c_base_ainv_solver_type, psb_c_vect_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_c_base_ainv_solver_type), intent(inout) :: sv
+      complex(psb_spk_),intent(in)            :: x(:)
+      integer(psb_ipk_), intent(out)       :: info
+    end subroutine amg_c_base_ainv_update_a
+  end interface
+
+  interface
+    subroutine amg_c_base_ainv_solver_apply(alpha,sv,x,beta,y,desc_data,&
+         & trans,work,info,init,initu)
+      import :: psb_desc_type, psb_spk_,amg_c_base_ainv_solver_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_c_base_ainv_solver_type), intent(inout) :: sv
+      complex(psb_spk_),intent(inout)         :: x(:)
+      complex(psb_spk_),intent(inout)         :: y(:)
+      complex(psb_spk_),intent(in)            :: alpha,beta
+      character(len=1),intent(in)          :: trans
+      complex(psb_spk_),target, intent(inout) :: work(:)
+      integer(psb_ipk_), intent(out)       :: info
+      character, intent(in), optional      :: init
+      complex(psb_spk_),intent(inout), optional :: initu(:)
+    end subroutine amg_c_base_ainv_solver_apply
+  end interface
+
+  interface
+    subroutine amg_c_base_ainv_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
+         &  trans,work,wv,info,init,initu)
+      import :: psb_desc_type, psb_spk_,amg_c_base_ainv_solver_type, psb_c_vect_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_c_base_ainv_solver_type), intent(inout) :: sv
+      type(psb_c_vect_type),intent(inout)  :: x
+      type(psb_c_vect_type),intent(inout)  :: y
+      complex(psb_spk_),intent(in)            :: alpha,beta
+      character(len=1),intent(in)          :: trans
+      complex(psb_spk_),target, intent(inout) :: work(:)
+      type(psb_c_vect_type),intent(inout)  :: wv(:)
+      integer(psb_ipk_), intent(out)       :: info
+      character, intent(in), optional      :: init
+      type(psb_c_vect_type),intent(inout), optional   :: initu
+    end subroutine amg_c_base_ainv_solver_apply_vect
+  end interface
+
+
+  interface
+    subroutine amg_c_base_ainv_solver_free(sv,info)
+      import :: psb_desc_type, psb_cspmat_type,  psb_c_base_sparse_mat, &
+           & psb_c_vect_type, psb_c_base_vect_type, psb_spk_, amg_c_base_ainv_solver_type, psb_ipk_
+      Implicit None
+
+      ! Arguments
+      class(amg_c_base_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(out)                    :: info
+    end subroutine amg_c_base_ainv_solver_free
+  end interface
+
+  interface
+    subroutine amg_c_base_ainv_solver_dmp(sv,desc,level,info,prefix,head,solver,global_num)
+      import :: psb_desc_type, psb_cspmat_type,  psb_c_base_sparse_mat, &
+           & psb_c_vect_type, psb_c_base_vect_type, psb_spk_, amg_c_base_ainv_solver_type, psb_ipk_
+
+      implicit none
+      class(amg_c_base_ainv_solver_type), intent(in) :: sv
+      type(psb_desc_type), intent(in)        :: desc
+      integer(psb_ipk_), intent(in)          :: level
+      integer(psb_ipk_), intent(out)         :: info
+      character(len=*), intent(in), optional :: prefix, head
+      logical, optional, intent(in)    :: solver, global_num
+    end subroutine amg_c_base_ainv_solver_dmp
+  end interface
+
+contains
+
+  function c_base_ainv_get_nzeros(sv) result(val)
+    implicit none
+    ! Arguments
+    class(amg_c_base_ainv_solver_type), intent(in) :: sv
+    integer(psb_epk_) :: val
+    integer             :: i
+
+    val = 0
+    val = val + sv%dv%get_nrows()
+    val = val + sv%w%get_nzeros()
+    val = val + sv%z%get_nzeros()
+
+    return
+  end function c_base_ainv_get_nzeros
+
+  function c_base_ainv_solver_sizeof(sv) result(val)
+    implicit none
+    ! Arguments
+    class(amg_c_base_ainv_solver_type), intent(in) :: sv
+    integer(psb_epk_) :: val
+    integer             :: i
+
+    val = 2*psb_sizeof_ip + psb_sizeof_dp
+    val = val + sv%dv%sizeof()
+    val = val + sv%w%sizeof()
+    val = val + sv%z%sizeof()
+
+    return
+  end function c_base_ainv_solver_sizeof
+
+  function c_base_ainv_get_wrksize() result(val)
+    implicit none
+    integer(psb_ipk_)  :: val
+
+    val = 2
+  end function c_base_ainv_get_wrksize
+
+end module amg_c_base_ainv_mod

amgprec/amg_d_ainv_solver.F90

@@ -0,0 +1,322 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+!
+!
+!
+!
+!
+module amg_d_ainv_solver
+
+  use amg_d_prec_type
+  use amg_d_base_ainv_mod
+  use psb_base_mod, only : psb_d_vect_type
+
+  type, extends(amg_d_base_ainv_solver_type) :: amg_d_ainv_solver_type
+    !
+    !  Compute an approximate factorization
+    !      A^-1 = Z D^-1 W^T
+    !  Note that here W is going to be transposed explicitly,
+    !  so that the component w will in the end contain W^T.
+    !
+    integer(psb_ipk_)   :: alg, fill_in
+    real(psb_dpk_)      :: thresh
+  contains
+    procedure, pass(sv) :: check   => amg_d_ainv_solver_check
+    procedure, pass(sv) :: build   => amg_d_ainv_solver_bld
+    procedure, pass(sv) :: clone   => amg_d_ainv_solver_clone
+    procedure, pass(sv) :: cseti   => amg_d_ainv_solver_cseti
+    procedure, pass(sv) :: csetc   => amg_d_ainv_solver_csetc
+    procedure, pass(sv) :: csetr   => amg_d_ainv_solver_csetr
+    procedure, pass(sv) :: seti    => amg_d_ainv_solver_seti
+    procedure, pass(sv) :: setc    => amg_d_ainv_solver_setc
+    procedure, pass(sv) :: setr    => amg_d_ainv_solver_setr
+    generic, public :: set => seti, setr, setc
+    procedure, pass(sv) :: descr   => amg_d_ainv_solver_descr
+    procedure, pass(sv) :: default => d_ainv_solver_default
+    procedure, nopass   :: stringval  => d_ainv_stringval
+    procedure, nopass   :: algname => d_ainv_algname
+  end type amg_d_ainv_solver_type
+
+
+  private :: d_ainv_stringval, d_ainv_solver_default, &
+       &  d_ainv_algname
+
+  interface
+    subroutine amg_d_ainv_solver_clone(sv,svout,info)
+      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat, &
+       & amg_d_base_solver_type, psb_dpk_, amg_d_ainv_solver_type, psb_ipk_
+      Implicit None
+      class(amg_d_ainv_solver_type), intent(inout)              :: sv
+      class(amg_d_base_solver_type), allocatable, intent(inout) :: svout
+      integer(psb_ipk_), intent(out)                            :: info
+    end subroutine amg_d_ainv_solver_clone
+  end interface
+
+
+  interface
+    subroutine amg_d_ainv_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
+      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat, &
+       & psb_d_vect_type, psb_d_base_vect_type, psb_dpk_,&
+       & amg_d_ainv_solver_type, psb_i_base_vect_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      type(psb_dspmat_type), intent(in), target           :: a
+      Type(psb_desc_type), Intent(inout)                  :: desc_a
+      class(amg_d_ainv_solver_type), intent(inout)        :: sv
+      integer(psb_ipk_), intent(out)                      :: info
+      type(psb_dspmat_type), intent(in), target, optional :: b
+      class(psb_d_base_sparse_mat), intent(in), optional  :: amold
+      class(psb_d_base_vect_type), intent(in), optional   :: vmold
+      class(psb_i_base_vect_type), intent(in), optional   :: imold
+    end subroutine amg_d_ainv_solver_bld
+  end interface
+
+  interface
+    subroutine amg_d_ainv_solver_check(sv,info)
+      import :: psb_dpk_, amg_d_ainv_solver_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      class(amg_d_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_d_ainv_solver_check
+  end interface
+
+  interface
+    subroutine amg_d_ainv_solver_cseti(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat, psb_ipk_,&
+           & psb_d_vect_type, psb_d_base_vect_type, psb_dpk_, amg_d_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_d_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      integer(psb_ipk_), intent(in)                :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_d_ainv_solver_cseti
+  end interface
+
+
+  interface
+    subroutine amg_d_ainv_solver_csetc(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat, psb_ipk_,&
+           & psb_d_vect_type, psb_d_base_vect_type, psb_dpk_, amg_d_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_d_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      character(len=*), intent(in)                 :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_d_ainv_solver_csetc
+  end interface
+
+  interface
+    subroutine amg_d_ainv_solver_csetr(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat,  psb_ipk_,&
+           & psb_d_vect_type, psb_d_base_vect_type, psb_dpk_, amg_d_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_d_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      real(psb_dpk_), intent(in)                   :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_d_ainv_solver_csetr
+  end interface
+
+  interface
+    subroutine amg_d_ainv_solver_setc(sv,what,val,info)
+      import :: amg_d_ainv_solver_type, psb_ipk_
+      Implicit none
+      ! Arguments
+      class(amg_d_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      character(len=*), intent(in)                 :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_d_ainv_solver_setc
+  end interface
+
+  interface
+    subroutine amg_d_ainv_solver_seti(sv,what,val,info)
+      import :: amg_d_ainv_solver_type, psb_ipk_
+      Implicit none
+      ! Arguments
+      class(amg_d_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      integer(psb_ipk_), intent(in)                :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_d_ainv_solver_seti
+  end interface
+
+  interface
+    subroutine amg_d_ainv_solver_setr(sv,what,val,info)
+      import :: amg_d_ainv_solver_type, psb_ipk_, psb_dpk_
+      Implicit none
+      ! Arguments
+      class(amg_d_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      real(psb_dpk_), intent(in)                   :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_d_ainv_solver_setr
+  end interface
+
+  interface
+    subroutine amg_d_ainv_solver_descr(sv,info,iout,coarse)
+      import :: psb_dpk_, amg_d_ainv_solver_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      class(amg_d_ainv_solver_type), intent(in) :: sv
+      integer(psb_ipk_), intent(out)            :: info
+      integer(psb_ipk_), intent(in), optional   :: iout
+      logical, intent(in), optional             :: coarse
+
+    end subroutine amg_d_ainv_solver_descr
+  end interface
+
+  interface  amg_ainv_bld
+    subroutine amg_d_ainv_bld(a,alg,fillin,thresh,wmat,d,zmat,desc,info,blck,iscale)
+      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat, &
+           & psb_d_vect_type, psb_d_base_vect_type, psb_dpk_, psb_ipk_
+      implicit none
+      type(psb_dspmat_type), intent(in), target   :: a
+      integer(psb_ipk_), intent(in)               :: fillin,alg
+      real(psb_dpk_), intent(in)                  :: thresh
+      type(psb_dspmat_type), intent(inout)        :: wmat, zmat
+      real(psb_dpk_), allocatable                 :: d(:)
+      Type(psb_desc_type), Intent(inout)          :: desc
+      integer(psb_ipk_), intent(out)              :: info
+      type(psb_dspmat_type), intent(in), optional :: blck
+      integer(psb_ipk_), intent(in), optional     :: iscale
+    end subroutine amg_d_ainv_bld
+  end interface
+
+
+contains
+
+  subroutine d_ainv_solver_default(sv)
+
+    use psb_base_mod
+
+    Implicit None
+
+    ! Arguments
+    class(amg_d_ainv_solver_type), intent(inout) :: sv
+
+    sv%alg     = amg_ainv_llk_
+    sv%fill_in = 0
+    sv%thresh  = dzero
+
+    return
+  end subroutine d_ainv_solver_default
+
+  function is_positive_nz_min(ip) result(res)
+    implicit none
+    integer(psb_ipk_), intent(in) :: ip
+    logical             :: res
+
+    res = (ip >= 1)
+    return
+  end function is_positive_nz_min
+
+
+  function d_ainv_stringval(string) result(val)
+    use psb_base_mod, only : psb_ipk_,psb_toupper
+    implicit none
+  ! Arguments
+    character(len=*), intent(in) :: string
+    integer(psb_ipk_) :: val
+    character(len=*), parameter :: name='d_ainv_stringval'
+
+    select case(psb_toupper(trim(string)))
+    case('LLK')
+      val = amg_ainv_llk_
+    case('STAB-LLK')
+      val = amg_ainv_s_ft_llk_
+    case('SYM-LLK')
+      val = amg_ainv_s_llk_
+    case('MLK')
+      val = amg_ainv_mlk_
+#if defined(HAVE_TUMA_SAINV)
+    case('SAINV-TUMA')
+      val = amg_ainv_s_tuma_
+    case('LAINV-TUMA')
+      val = amg_ainv_l_tuma_
+#endif
+    case default
+      val  = amg_stringval(string)
+    end select
+  end function d_ainv_stringval
+
+
+  function d_ainv_algname(ialg) result(val)
+    integer(psb_ipk_), intent(in) :: ialg
+    character(len=40) :: val
+
+    character(len=*), parameter :: mlkname   = 'Left-looking, list merge '
+    character(len=*), parameter :: llkname   = 'Left-looking '
+    character(len=*), parameter :: stabllkname  = 'Stabilized Left-looking '
+    character(len=*), parameter :: sllkname  = 'Symmetric Left-looking '
+    character(len=*), parameter :: sainvname = 'SAINV (Benzi & Tuma) '
+    character(len=*), parameter :: lainvname = 'LAINV (Benzi & Tuma) '
+    character(len=*), parameter :: defname   = 'Unknown alg variant '
+
+    select case (ialg)
+    case(amg_ainv_mlk_)
+      val = mlkname
+    case(amg_ainv_llk_)
+      val = llkname
+    case(amg_ainv_s_llk_)
+      val = sllkname
+    case(amg_ainv_s_ft_llk_)
+      val = stabllkname
+#if defined(HAVE_TUMA_SAINV)
+    case(amg_ainv_s_tuma_ )
+      val = sainvname
+    case(amg_ainv_l_tuma_ )
+      val = lainvname
+#endif
+    case default
+      val = defname
+    end select
+
+  end function d_ainv_algname
+
+end module amg_d_ainv_solver

amgprec/amg_d_base_ainv_mod.f90

@@ -0,0 +1,199 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+!
+module amg_d_base_ainv_mod
+
+  use amg_base_ainv_mod
+  use amg_d_prec_type
+  use psb_d_ainv_tools_mod
+  use psb_base_mod, only : psb_d_vect_type, psb_dpk_, psb_epk_
+
+
+
+  type, extends(amg_d_base_solver_type) :: amg_d_base_ainv_solver_type
+    !
+    !  Compute an approximate factorization
+    !      A^-1 = Z D^-1 W^T
+    !  Note that here W is going to be transposed explicitly,
+    !  so that the component w will in the end contain W^T.
+    !
+    type(psb_dspmat_type)       :: w, z
+    type(psb_d_vect_type)       :: dv
+    real(psb_dpk_), allocatable :: d(:)
+
+  contains
+    procedure, pass(sv) :: cnv     => amg_d_base_ainv_solver_cnv
+    procedure, pass(sv) :: dump    => amg_d_base_ainv_solver_dmp
+    procedure, pass(sv) :: apply_v => amg_d_base_ainv_solver_apply_vect
+    procedure, pass(sv) :: apply_a => amg_d_base_ainv_solver_apply
+    procedure, pass(sv) :: free    => amg_d_base_ainv_solver_free
+    procedure, pass(sv) :: sizeof  => d_base_ainv_solver_sizeof
+    procedure, pass(sv) :: get_nzeros => d_base_ainv_get_nzeros
+    procedure, nopass   :: get_wrksz => d_base_ainv_get_wrksize
+    procedure, pass(sv) :: update_a => amg_d_base_ainv_update_a
+    generic, public     :: update => update_a
+  end type amg_d_base_ainv_solver_type
+
+  private ::  d_base_ainv_solver_sizeof, &
+       & d_base_ainv_get_nzeros, d_base_ainv_get_wrksize
+
+
+  interface
+    subroutine amg_d_base_ainv_solver_cnv(sv,info,amold,vmold,imold)
+      import :: psb_d_base_sparse_mat, psb_d_base_vect_type, psb_dpk_, &
+       & amg_d_base_ainv_solver_type, psb_ipk_, psb_i_base_vect_type
+      Implicit None
+      ! Arguments
+      class(amg_d_base_ainv_solver_type), intent(inout)  :: sv
+      integer(psb_ipk_), intent(out)                     :: info
+      class(psb_d_base_sparse_mat), intent(in), optional :: amold
+      class(psb_d_base_vect_type), intent(in), optional  :: vmold
+      class(psb_i_base_vect_type), intent(in), optional  :: imold
+    end subroutine amg_d_base_ainv_solver_cnv
+  end interface
+
+  interface
+    subroutine amg_d_base_ainv_update_a(sv,x,desc_data,info)
+      import :: psb_desc_type, psb_dpk_,amg_d_base_ainv_solver_type, psb_d_vect_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_d_base_ainv_solver_type), intent(inout) :: sv
+      real(psb_dpk_),intent(in)            :: x(:)
+      integer(psb_ipk_), intent(out)       :: info
+    end subroutine amg_d_base_ainv_update_a
+  end interface
+
+  interface
+    subroutine amg_d_base_ainv_solver_apply(alpha,sv,x,beta,y,desc_data,&
+         & trans,work,info,init,initu)
+      import :: psb_desc_type, psb_dpk_,amg_d_base_ainv_solver_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_d_base_ainv_solver_type), intent(inout) :: sv
+      real(psb_dpk_),intent(inout)         :: x(:)
+      real(psb_dpk_),intent(inout)         :: y(:)
+      real(psb_dpk_),intent(in)            :: alpha,beta
+      character(len=1),intent(in)          :: trans
+      real(psb_dpk_),target, intent(inout) :: work(:)
+      integer(psb_ipk_), intent(out)       :: info
+      character, intent(in), optional      :: init
+      real(psb_dpk_),intent(inout), optional :: initu(:)
+    end subroutine amg_d_base_ainv_solver_apply
+  end interface
+
+  interface
+    subroutine amg_d_base_ainv_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
+         &  trans,work,wv,info,init,initu)
+      import :: psb_desc_type, psb_dpk_,amg_d_base_ainv_solver_type, psb_d_vect_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_d_base_ainv_solver_type), intent(inout) :: sv
+      type(psb_d_vect_type),intent(inout)  :: x
+      type(psb_d_vect_type),intent(inout)  :: y
+      real(psb_dpk_),intent(in)            :: alpha,beta
+      character(len=1),intent(in)          :: trans
+      real(psb_dpk_),target, intent(inout) :: work(:)
+      type(psb_d_vect_type),intent(inout)  :: wv(:)
+      integer(psb_ipk_), intent(out)       :: info
+      character, intent(in), optional      :: init
+      type(psb_d_vect_type),intent(inout), optional   :: initu
+    end subroutine amg_d_base_ainv_solver_apply_vect
+  end interface
+
+
+  interface
+    subroutine amg_d_base_ainv_solver_free(sv,info)
+      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat, &
+           & psb_d_vect_type, psb_d_base_vect_type, psb_dpk_, amg_d_base_ainv_solver_type, psb_ipk_
+      Implicit None
+
+      ! Arguments
+      class(amg_d_base_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(out)                    :: info
+    end subroutine amg_d_base_ainv_solver_free
+  end interface
+
+  interface
+    subroutine amg_d_base_ainv_solver_dmp(sv,desc,level,info,prefix,head,solver,global_num)
+      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat, &
+           & psb_d_vect_type, psb_d_base_vect_type, psb_dpk_, amg_d_base_ainv_solver_type, psb_ipk_
+
+      implicit none
+      class(amg_d_base_ainv_solver_type), intent(in) :: sv
+      type(psb_desc_type), intent(in)        :: desc
+      integer(psb_ipk_), intent(in)          :: level
+      integer(psb_ipk_), intent(out)         :: info
+      character(len=*), intent(in), optional :: prefix, head
+      logical, optional, intent(in)    :: solver, global_num
+    end subroutine amg_d_base_ainv_solver_dmp
+  end interface
+
+contains
+
+  function d_base_ainv_get_nzeros(sv) result(val)
+    implicit none
+    ! Arguments
+    class(amg_d_base_ainv_solver_type), intent(in) :: sv
+    integer(psb_epk_) :: val
+    integer             :: i
+
+    val = 0
+    val = val + sv%dv%get_nrows()
+    val = val + sv%w%get_nzeros()
+    val = val + sv%z%get_nzeros()
+
+    return
+  end function d_base_ainv_get_nzeros
+
+  function d_base_ainv_solver_sizeof(sv) result(val)
+    implicit none
+    ! Arguments
+    class(amg_d_base_ainv_solver_type), intent(in) :: sv
+    integer(psb_epk_) :: val
+    integer             :: i
+
+    val = 2*psb_sizeof_ip + psb_sizeof_dp
+    val = val + sv%dv%sizeof()
+    val = val + sv%w%sizeof()
+    val = val + sv%z%sizeof()
+
+    return
+  end function d_base_ainv_solver_sizeof
+
+  function d_base_ainv_get_wrksize() result(val)
+    implicit none
+    integer(psb_ipk_)  :: val
+
+    val = 2
+  end function d_base_ainv_get_wrksize
+
+end module amg_d_base_ainv_mod

amgprec/amg_s_ainv_solver.F90

@@ -0,0 +1,322 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+!
+!
+!
+!
+!
+module amg_s_ainv_solver
+
+  use amg_s_prec_type
+  use amg_s_base_ainv_mod
+  use psb_base_mod, only : psb_d_vect_type
+
+  type, extends(amg_s_base_ainv_solver_type) :: amg_s_ainv_solver_type
+    !
+    !  Compute an approximate factorization
+    !      A^-1 = Z D^-1 W^T
+    !  Note that here W is going to be transposed explicitly,
+    !  so that the component w will in the end contain W^T.
+    !
+    integer(psb_ipk_)   :: alg, fill_in
+    real(psb_spk_)      :: thresh
+  contains
+    procedure, pass(sv) :: check   => amg_s_ainv_solver_check
+    procedure, pass(sv) :: build   => amg_s_ainv_solver_bld
+    procedure, pass(sv) :: clone   => amg_s_ainv_solver_clone
+    procedure, pass(sv) :: cseti   => amg_s_ainv_solver_cseti
+    procedure, pass(sv) :: csetc   => amg_s_ainv_solver_csetc
+    procedure, pass(sv) :: csetr   => amg_s_ainv_solver_csetr
+    procedure, pass(sv) :: seti    => amg_s_ainv_solver_seti
+    procedure, pass(sv) :: setc    => amg_s_ainv_solver_setc
+    procedure, pass(sv) :: setr    => amg_s_ainv_solver_setr
+    generic, public :: set => seti, setr, setc
+    procedure, pass(sv) :: descr   => amg_s_ainv_solver_descr
+    procedure, pass(sv) :: default => s_ainv_solver_default
+    procedure, nopass   :: stringval  => s_ainv_stringval
+    procedure, nopass   :: algname => s_ainv_algname
+  end type amg_s_ainv_solver_type
+
+
+  private :: s_ainv_stringval, s_ainv_solver_default, &
+       &  s_ainv_algname
+
+  interface
+    subroutine amg_s_ainv_solver_clone(sv,svout,info)
+      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, &
+       & amg_s_base_solver_type, psb_dpk_, amg_s_ainv_solver_type, psb_ipk_
+      Implicit None
+      class(amg_s_ainv_solver_type), intent(inout)              :: sv
+      class(amg_s_base_solver_type), allocatable, intent(inout) :: svout
+      integer(psb_ipk_), intent(out)                            :: info
+    end subroutine amg_s_ainv_solver_clone
+  end interface
+
+
+  interface
+    subroutine amg_s_ainv_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
+      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, &
+       & psb_d_vect_type, psb_s_base_vect_type, psb_dpk_,&
+       & amg_s_ainv_solver_type, psb_i_base_vect_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      type(psb_sspmat_type), intent(in), target           :: a
+      Type(psb_desc_type), Intent(inout)                  :: desc_a
+      class(amg_s_ainv_solver_type), intent(inout)        :: sv
+      integer(psb_ipk_), intent(out)                      :: info
+      type(psb_sspmat_type), intent(in), target, optional :: b
+      class(psb_s_base_sparse_mat), intent(in), optional  :: amold
+      class(psb_s_base_vect_type), intent(in), optional   :: vmold
+      class(psb_i_base_vect_type), intent(in), optional   :: imold
+    end subroutine amg_s_ainv_solver_bld
+  end interface
+
+  interface
+    subroutine amg_s_ainv_solver_check(sv,info)
+      import :: psb_dpk_, amg_s_ainv_solver_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      class(amg_s_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_s_ainv_solver_check
+  end interface
+
+  interface
+    subroutine amg_s_ainv_solver_cseti(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, psb_ipk_,&
+           & psb_d_vect_type, psb_s_base_vect_type, psb_dpk_, amg_s_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_s_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      integer(psb_ipk_), intent(in)                :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_s_ainv_solver_cseti
+  end interface
+
+
+  interface
+    subroutine amg_s_ainv_solver_csetc(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, psb_ipk_,&
+           & psb_d_vect_type, psb_s_base_vect_type, psb_dpk_, amg_s_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_s_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      character(len=*), intent(in)                 :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_s_ainv_solver_csetc
+  end interface
+
+  interface
+    subroutine amg_s_ainv_solver_csetr(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat,  psb_ipk_,&
+           & psb_d_vect_type, psb_s_base_vect_type, psb_spk_, amg_s_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_s_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      real(psb_spk_), intent(in)                   :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_s_ainv_solver_csetr
+  end interface
+
+  interface
+    subroutine amg_s_ainv_solver_setc(sv,what,val,info)
+      import :: amg_s_ainv_solver_type, psb_ipk_
+      Implicit none
+      ! Arguments
+      class(amg_s_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      character(len=*), intent(in)                 :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_s_ainv_solver_setc
+  end interface
+
+  interface
+    subroutine amg_s_ainv_solver_seti(sv,what,val,info)
+      import :: amg_s_ainv_solver_type, psb_ipk_
+      Implicit none
+      ! Arguments
+      class(amg_s_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      integer(psb_ipk_), intent(in)                :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_s_ainv_solver_seti
+  end interface
+
+  interface
+    subroutine amg_s_ainv_solver_setr(sv,what,val,info)
+      import :: amg_s_ainv_solver_type, psb_ipk_, psb_spk_
+      Implicit none
+      ! Arguments
+      class(amg_s_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      real(psb_spk_), intent(in)                   :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_s_ainv_solver_setr
+  end interface
+
+  interface
+    subroutine amg_s_ainv_solver_descr(sv,info,iout,coarse)
+      import :: psb_dpk_, amg_s_ainv_solver_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      class(amg_s_ainv_solver_type), intent(in) :: sv
+      integer(psb_ipk_), intent(out)            :: info
+      integer(psb_ipk_), intent(in), optional   :: iout
+      logical, intent(in), optional             :: coarse
+
+    end subroutine amg_s_ainv_solver_descr
+  end interface
+
+  interface  amg_ainv_bld
+    subroutine amg_s_ainv_bld(a,alg,fillin,thresh,wmat,d,zmat,desc,info,blck,iscale)
+      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, &
+           & psb_d_vect_type, psb_s_base_vect_type, psb_spk_, psb_ipk_
+      implicit none
+      type(psb_sspmat_type), intent(in), target   :: a
+      integer(psb_ipk_), intent(in)               :: fillin,alg
+      real(psb_spk_), intent(in)                  :: thresh
+      type(psb_sspmat_type), intent(inout)        :: wmat, zmat
+      real(psb_spk_), allocatable                 :: d(:)
+      Type(psb_desc_type), Intent(inout)          :: desc
+      integer(psb_ipk_), intent(out)              :: info
+      type(psb_sspmat_type), intent(in), optional :: blck
+      integer(psb_ipk_), intent(in), optional     :: iscale
+    end subroutine amg_s_ainv_bld
+  end interface
+
+
+contains
+
+  subroutine s_ainv_solver_default(sv)
+
+    use psb_base_mod
+
+    Implicit None
+
+    ! Arguments
+    class(amg_s_ainv_solver_type), intent(inout) :: sv
+
+    sv%alg     = amg_ainv_llk_
+    sv%fill_in = 0
+    sv%thresh  = dzero
+
+    return
+  end subroutine s_ainv_solver_default
+
+  function is_positive_nz_min(ip) result(res)
+    implicit none
+    integer(psb_ipk_), intent(in) :: ip
+    logical             :: res
+
+    res = (ip >= 1)
+    return
+  end function is_positive_nz_min
+
+
+  function s_ainv_stringval(string) result(val)
+    use psb_base_mod, only : psb_ipk_,psb_toupper
+    implicit none
+  ! Arguments
+    character(len=*), intent(in) :: string
+    integer(psb_ipk_) :: val
+    character(len=*), parameter :: name='d_ainv_stringval'
+
+    select case(psb_toupper(trim(string)))
+    case('LLK')
+      val = amg_ainv_llk_
+    case('STAB-LLK')
+      val = amg_ainv_s_ft_llk_
+    case('SYM-LLK')
+      val = amg_ainv_s_llk_
+    case('MLK')
+      val = amg_ainv_mlk_
+#if defined(HAVE_TUMA_SAINV)
+    case('SAINV-TUMA')
+      val = amg_ainv_s_tuma_
+    case('LAINV-TUMA')
+      val = amg_ainv_l_tuma_
+#endif
+    case default
+      val  = amg_stringval(string)
+    end select
+  end function s_ainv_stringval
+
+
+  function s_ainv_algname(ialg) result(val)
+    integer(psb_ipk_), intent(in) :: ialg
+    character(len=40) :: val
+
+    character(len=*), parameter :: mlkname   = 'Left-looking, list merge '
+    character(len=*), parameter :: llkname   = 'Left-looking '
+    character(len=*), parameter :: stabllkname  = 'Stabilized Left-looking '
+    character(len=*), parameter :: sllkname  = 'Symmetric Left-looking '
+    character(len=*), parameter :: sainvname = 'SAINV (Benzi & Tuma) '
+    character(len=*), parameter :: lainvname = 'LAINV (Benzi & Tuma) '
+    character(len=*), parameter :: defname   = 'Unknown alg variant '
+
+    select case (ialg)
+    case(amg_ainv_mlk_)
+      val = mlkname
+    case(amg_ainv_llk_)
+      val = llkname
+    case(amg_ainv_s_llk_)
+      val = sllkname
+    case(amg_ainv_s_ft_llk_)
+      val = stabllkname
+#if defined(HAVE_TUMA_SAINV)
+    case(amg_ainv_s_tuma_ )
+      val = sainvname
+    case(amg_ainv_l_tuma_ )
+      val = lainvname
+#endif
+    case default
+      val = defname
+    end select
+
+  end function s_ainv_algname
+
+end module amg_s_ainv_solver

amgprec/amg_s_base_ainv_mod.f90

@@ -0,0 +1,199 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+!
+module amg_s_base_ainv_mod
+
+  use amg_base_ainv_mod
+  use amg_s_prec_type
+  use psb_s_ainv_tools_mod
+  use psb_base_mod, only : psb_s_vect_type, psb_spk_, psb_epk_
+
+
+
+  type, extends(amg_s_base_solver_type) :: amg_s_base_ainv_solver_type
+    !
+    !  Compute an approximate factorization
+    !      A^-1 = Z D^-1 W^T
+    !  Note that here W is going to be transposed explicitly,
+    !  so that the component w will in the end contain W^T.
+    !
+    type(psb_sspmat_type)       :: w, z
+    type(psb_s_vect_type)       :: dv
+    real(psb_spk_), allocatable :: d(:)
+
+  contains
+    procedure, pass(sv) :: cnv     => amg_s_base_ainv_solver_cnv
+    procedure, pass(sv) :: dump    => amg_s_base_ainv_solver_dmp
+    procedure, pass(sv) :: apply_v => amg_s_base_ainv_solver_apply_vect
+    procedure, pass(sv) :: apply_a => amg_s_base_ainv_solver_apply
+    procedure, pass(sv) :: free    => amg_s_base_ainv_solver_free
+    procedure, pass(sv) :: sizeof  => s_base_ainv_solver_sizeof
+    procedure, pass(sv) :: get_nzeros => s_base_ainv_get_nzeros
+    procedure, nopass   :: get_wrksz => s_base_ainv_get_wrksize
+    procedure, pass(sv) :: update_a => amg_s_base_ainv_update_a
+    generic, public     :: update => update_a
+  end type amg_s_base_ainv_solver_type
+
+  private ::  s_base_ainv_solver_sizeof, &
+       & s_base_ainv_get_nzeros, s_base_ainv_get_wrksize
+
+
+  interface
+    subroutine amg_s_base_ainv_solver_cnv(sv,info,amold,vmold,imold)
+      import :: psb_s_base_sparse_mat, psb_s_base_vect_type, psb_spk_, &
+       & amg_s_base_ainv_solver_type, psb_ipk_, psb_i_base_vect_type
+      Implicit None
+      ! Arguments
+      class(amg_s_base_ainv_solver_type), intent(inout)  :: sv
+      integer(psb_ipk_), intent(out)                     :: info
+      class(psb_s_base_sparse_mat), intent(in), optional :: amold
+      class(psb_s_base_vect_type), intent(in), optional  :: vmold
+      class(psb_i_base_vect_type), intent(in), optional  :: imold
+    end subroutine amg_s_base_ainv_solver_cnv
+  end interface
+
+  interface
+    subroutine amg_s_base_ainv_update_a(sv,x,desc_data,info)
+      import :: psb_desc_type, psb_spk_,amg_s_base_ainv_solver_type, psb_s_vect_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_s_base_ainv_solver_type), intent(inout) :: sv
+      real(psb_spk_),intent(in)            :: x(:)
+      integer(psb_ipk_), intent(out)       :: info
+    end subroutine amg_s_base_ainv_update_a
+  end interface
+
+  interface
+    subroutine amg_s_base_ainv_solver_apply(alpha,sv,x,beta,y,desc_data,&
+         & trans,work,info,init,initu)
+      import :: psb_desc_type, psb_spk_,amg_s_base_ainv_solver_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_s_base_ainv_solver_type), intent(inout) :: sv
+      real(psb_spk_),intent(inout)         :: x(:)
+      real(psb_spk_),intent(inout)         :: y(:)
+      real(psb_spk_),intent(in)            :: alpha,beta
+      character(len=1),intent(in)          :: trans
+      real(psb_spk_),target, intent(inout) :: work(:)
+      integer(psb_ipk_), intent(out)       :: info
+      character, intent(in), optional      :: init
+      real(psb_spk_),intent(inout), optional :: initu(:)
+    end subroutine amg_s_base_ainv_solver_apply
+  end interface
+
+  interface
+    subroutine amg_s_base_ainv_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
+         &  trans,work,wv,info,init,initu)
+      import :: psb_desc_type, psb_spk_,amg_s_base_ainv_solver_type, psb_s_vect_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_s_base_ainv_solver_type), intent(inout) :: sv
+      type(psb_s_vect_type),intent(inout)  :: x
+      type(psb_s_vect_type),intent(inout)  :: y
+      real(psb_spk_),intent(in)            :: alpha,beta
+      character(len=1),intent(in)          :: trans
+      real(psb_spk_),target, intent(inout) :: work(:)
+      type(psb_s_vect_type),intent(inout)  :: wv(:)
+      integer(psb_ipk_), intent(out)       :: info
+      character, intent(in), optional      :: init
+      type(psb_s_vect_type),intent(inout), optional   :: initu
+    end subroutine amg_s_base_ainv_solver_apply_vect
+  end interface
+
+
+  interface
+    subroutine amg_s_base_ainv_solver_free(sv,info)
+      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, &
+           & psb_s_vect_type, psb_s_base_vect_type, psb_spk_, amg_s_base_ainv_solver_type, psb_ipk_
+      Implicit None
+
+      ! Arguments
+      class(amg_s_base_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(out)                    :: info
+    end subroutine amg_s_base_ainv_solver_free
+  end interface
+
+  interface
+    subroutine amg_s_base_ainv_solver_dmp(sv,desc,level,info,prefix,head,solver,global_num)
+      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, &
+           & psb_s_vect_type, psb_s_base_vect_type, psb_spk_, amg_s_base_ainv_solver_type, psb_ipk_
+
+      implicit none
+      class(amg_s_base_ainv_solver_type), intent(in) :: sv
+      type(psb_desc_type), intent(in)        :: desc
+      integer(psb_ipk_), intent(in)          :: level
+      integer(psb_ipk_), intent(out)         :: info
+      character(len=*), intent(in), optional :: prefix, head
+      logical, optional, intent(in)    :: solver, global_num
+    end subroutine amg_s_base_ainv_solver_dmp
+  end interface
+
+contains
+
+  function s_base_ainv_get_nzeros(sv) result(val)
+    implicit none
+    ! Arguments
+    class(amg_s_base_ainv_solver_type), intent(in) :: sv
+    integer(psb_epk_) :: val
+    integer             :: i
+
+    val = 0
+    val = val + sv%dv%get_nrows()
+    val = val + sv%w%get_nzeros()
+    val = val + sv%z%get_nzeros()
+
+    return
+  end function s_base_ainv_get_nzeros
+
+  function s_base_ainv_solver_sizeof(sv) result(val)
+    implicit none
+    ! Arguments
+    class(amg_s_base_ainv_solver_type), intent(in) :: sv
+    integer(psb_epk_) :: val
+    integer             :: i
+
+    val = 2*psb_sizeof_ip + psb_sizeof_dp
+    val = val + sv%dv%sizeof()
+    val = val + sv%w%sizeof()
+    val = val + sv%z%sizeof()
+
+    return
+  end function s_base_ainv_solver_sizeof
+
+  function s_base_ainv_get_wrksize() result(val)
+    implicit none
+    integer(psb_ipk_)  :: val
+
+    val = 2
+  end function s_base_ainv_get_wrksize
+
+end module amg_s_base_ainv_mod

amgprec/amg_z_ainv_solver.F90

@@ -0,0 +1,322 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+!
+!
+!
+!
+!
+module amg_z_ainv_solver
+
+  use amg_z_prec_type
+  use amg_z_base_ainv_mod
+  use psb_base_mod, only : psb_d_vect_type
+
+  type, extends(amg_z_base_ainv_solver_type) :: amg_z_ainv_solver_type
+    !
+    !  Compute an approximate factorization
+    !      A^-1 = Z D^-1 W^T
+    !  Note that here W is going to be transposed explicitly,
+    !  so that the component w will in the end contain W^T.
+    !
+    integer(psb_ipk_)   :: alg, fill_in
+    real(psb_dpk_)      :: thresh
+  contains
+    procedure, pass(sv) :: check   => amg_z_ainv_solver_check
+    procedure, pass(sv) :: build   => amg_z_ainv_solver_bld
+    procedure, pass(sv) :: clone   => amg_z_ainv_solver_clone
+    procedure, pass(sv) :: cseti   => amg_z_ainv_solver_cseti
+    procedure, pass(sv) :: csetc   => amg_z_ainv_solver_csetc
+    procedure, pass(sv) :: csetr   => amg_z_ainv_solver_csetr
+    procedure, pass(sv) :: seti    => amg_z_ainv_solver_seti
+    procedure, pass(sv) :: setc    => amg_z_ainv_solver_setc
+    procedure, pass(sv) :: setr    => amg_z_ainv_solver_setr
+    generic, public :: set => seti, setr, setc
+    procedure, pass(sv) :: descr   => amg_z_ainv_solver_descr
+    procedure, pass(sv) :: default => z_ainv_solver_default
+    procedure, nopass   :: stringval  => z_ainv_stringval
+    procedure, nopass   :: algname => z_ainv_algname
+  end type amg_z_ainv_solver_type
+
+
+  private :: z_ainv_stringval, z_ainv_solver_default, &
+       &  z_ainv_algname
+
+  interface
+    subroutine amg_z_ainv_solver_clone(sv,svout,info)
+      import :: psb_desc_type, psb_zspmat_type,  psb_z_base_sparse_mat, &
+       & amg_z_base_solver_type, psb_dpk_, amg_z_ainv_solver_type, psb_ipk_
+      Implicit None
+      class(amg_z_ainv_solver_type), intent(inout)              :: sv
+      class(amg_z_base_solver_type), allocatable, intent(inout) :: svout
+      integer(psb_ipk_), intent(out)                            :: info
+    end subroutine amg_z_ainv_solver_clone
+  end interface
+
+
+  interface
+    subroutine amg_z_ainv_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
+      import :: psb_desc_type, psb_zspmat_type,  psb_z_base_sparse_mat, &
+       & psb_d_vect_type, psb_z_base_vect_type, psb_dpk_,&
+       & amg_z_ainv_solver_type, psb_i_base_vect_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      type(psb_zspmat_type), intent(in), target           :: a
+      Type(psb_desc_type), Intent(inout)                  :: desc_a
+      class(amg_z_ainv_solver_type), intent(inout)        :: sv
+      integer(psb_ipk_), intent(out)                      :: info
+      type(psb_zspmat_type), intent(in), target, optional :: b
+      class(psb_z_base_sparse_mat), intent(in), optional  :: amold
+      class(psb_z_base_vect_type), intent(in), optional   :: vmold
+      class(psb_i_base_vect_type), intent(in), optional   :: imold
+    end subroutine amg_z_ainv_solver_bld
+  end interface
+
+  interface
+    subroutine amg_z_ainv_solver_check(sv,info)
+      import :: psb_dpk_, amg_z_ainv_solver_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      class(amg_z_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_z_ainv_solver_check
+  end interface
+
+  interface
+    subroutine amg_z_ainv_solver_cseti(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_zspmat_type,  psb_z_base_sparse_mat, psb_ipk_,&
+           & psb_d_vect_type, psb_z_base_vect_type, psb_dpk_, amg_z_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_z_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      integer(psb_ipk_), intent(in)                :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_z_ainv_solver_cseti
+  end interface
+
+
+  interface
+    subroutine amg_z_ainv_solver_csetc(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_zspmat_type,  psb_z_base_sparse_mat, psb_ipk_,&
+           & psb_d_vect_type, psb_z_base_vect_type, psb_dpk_, amg_z_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_z_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      character(len=*), intent(in)                 :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_z_ainv_solver_csetc
+  end interface
+
+  interface
+    subroutine amg_z_ainv_solver_csetr(sv,what,val,info,idx)
+      import :: psb_desc_type, psb_zspmat_type,  psb_z_base_sparse_mat,  psb_ipk_,&
+           & psb_d_vect_type, psb_z_base_vect_type, psb_dpk_, amg_z_ainv_solver_type
+      Implicit None
+      ! Arguments
+      class(amg_z_ainv_solver_type), intent(inout) :: sv
+      character(len=*), intent(in)                 :: what
+      real(psb_dpk_), intent(in)                   :: val
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), intent(in), optional      :: idx
+    end subroutine amg_z_ainv_solver_csetr
+  end interface
+
+  interface
+    subroutine amg_z_ainv_solver_setc(sv,what,val,info)
+      import :: amg_z_ainv_solver_type, psb_ipk_
+      Implicit none
+      ! Arguments
+      class(amg_z_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      character(len=*), intent(in)                 :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_z_ainv_solver_setc
+  end interface
+
+  interface
+    subroutine amg_z_ainv_solver_seti(sv,what,val,info)
+      import :: amg_z_ainv_solver_type, psb_ipk_
+      Implicit none
+      ! Arguments
+      class(amg_z_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      integer(psb_ipk_), intent(in)                :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_z_ainv_solver_seti
+  end interface
+
+  interface
+    subroutine amg_z_ainv_solver_setr(sv,what,val,info)
+      import :: amg_z_ainv_solver_type, psb_ipk_, psb_dpk_
+      Implicit none
+      ! Arguments
+      class(amg_z_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(in)                :: what
+      real(psb_dpk_), intent(in)                   :: val
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine amg_z_ainv_solver_setr
+  end interface
+
+  interface
+    subroutine amg_z_ainv_solver_descr(sv,info,iout,coarse)
+      import :: psb_dpk_, amg_z_ainv_solver_type, psb_ipk_
+
+      Implicit None
+
+      ! Arguments
+      class(amg_z_ainv_solver_type), intent(in) :: sv
+      integer(psb_ipk_), intent(out)            :: info
+      integer(psb_ipk_), intent(in), optional   :: iout
+      logical, intent(in), optional             :: coarse
+
+    end subroutine amg_z_ainv_solver_descr
+  end interface
+
+  interface  amg_ainv_bld
+    subroutine amg_z_ainv_bld(a,alg,fillin,thresh,wmat,d,zmat,desc,info,blck,iscale)
+      import :: psb_desc_type, psb_zspmat_type,  psb_z_base_sparse_mat, &
+           & psb_d_vect_type, psb_z_base_vect_type, psb_dpk_, psb_ipk_
+      implicit none
+      type(psb_zspmat_type), intent(in), target   :: a
+      integer(psb_ipk_), intent(in)               :: fillin,alg
+      real(psb_dpk_), intent(in)                  :: thresh
+      type(psb_zspmat_type), intent(inout)        :: wmat, zmat
+      complex(psb_dpk_), allocatable                 :: d(:)
+      Type(psb_desc_type), Intent(inout)          :: desc
+      integer(psb_ipk_), intent(out)              :: info
+      type(psb_zspmat_type), intent(in), optional :: blck
+      integer(psb_ipk_), intent(in), optional     :: iscale
+    end subroutine amg_z_ainv_bld
+  end interface
+
+
+contains
+
+  subroutine z_ainv_solver_default(sv)
+
+    use psb_base_mod
+
+    Implicit None
+
+    ! Arguments
+    class(amg_z_ainv_solver_type), intent(inout) :: sv
+
+    sv%alg     = amg_ainv_llk_
+    sv%fill_in = 0
+    sv%thresh  = dzero
+
+    return
+  end subroutine z_ainv_solver_default
+
+  function is_positive_nz_min(ip) result(res)
+    implicit none
+    integer(psb_ipk_), intent(in) :: ip
+    logical             :: res
+
+    res = (ip >= 1)
+    return
+  end function is_positive_nz_min
+
+
+  function z_ainv_stringval(string) result(val)
+    use psb_base_mod, only : psb_ipk_,psb_toupper
+    implicit none
+  ! Arguments
+    character(len=*), intent(in) :: string
+    integer(psb_ipk_) :: val
+    character(len=*), parameter :: name='d_ainv_stringval'
+
+    select case(psb_toupper(trim(string)))
+    case('LLK')
+      val = amg_ainv_llk_
+    case('STAB-LLK')
+      val = amg_ainv_s_ft_llk_
+    case('SYM-LLK')
+      val = amg_ainv_s_llk_
+    case('MLK')
+      val = amg_ainv_mlk_
+#if defined(HAVE_TUMA_SAINV)
+    case('SAINV-TUMA')
+      val = amg_ainv_s_tuma_
+    case('LAINV-TUMA')
+      val = amg_ainv_l_tuma_
+#endif
+    case default
+      val  = amg_stringval(string)
+    end select
+  end function z_ainv_stringval
+
+
+  function z_ainv_algname(ialg) result(val)
+    integer(psb_ipk_), intent(in) :: ialg
+    character(len=40) :: val
+
+    character(len=*), parameter :: mlkname   = 'Left-looking, list merge '
+    character(len=*), parameter :: llkname   = 'Left-looking '
+    character(len=*), parameter :: stabllkname  = 'Stabilized Left-looking '
+    character(len=*), parameter :: sllkname  = 'Symmetric Left-looking '
+    character(len=*), parameter :: sainvname = 'SAINV (Benzi & Tuma) '
+    character(len=*), parameter :: lainvname = 'LAINV (Benzi & Tuma) '
+    character(len=*), parameter :: defname   = 'Unknown alg variant '
+
+    select case (ialg)
+    case(amg_ainv_mlk_)
+      val = mlkname
+    case(amg_ainv_llk_)
+      val = llkname
+    case(amg_ainv_s_llk_)
+      val = sllkname
+    case(amg_ainv_s_ft_llk_)
+      val = stabllkname
+#if defined(HAVE_TUMA_SAINV)
+    case(amg_ainv_s_tuma_ )
+      val = sainvname
+    case(amg_ainv_l_tuma_ )
+      val = lainvname
+#endif
+    case default
+      val = defname
+    end select
+
+  end function z_ainv_algname
+
+end module amg_z_ainv_solver

amgprec/amg_z_base_ainv_mod.f90

@@ -0,0 +1,199 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+!
+module amg_z_base_ainv_mod
+
+  use amg_base_ainv_mod
+  use amg_z_prec_type
+  use psb_z_ainv_tools_mod
+  use psb_base_mod, only : psb_z_vect_type, psb_dpk_, psb_epk_
+
+
+
+  type, extends(amg_z_base_solver_type) :: amg_z_base_ainv_solver_type
+    !
+    !  Compute an approximate factorization
+    !      A^-1 = Z D^-1 W^T
+    !  Note that here W is going to be transposed explicitly,
+    !  so that the component w will in the end contain W^T.
+    !
+    type(psb_zspmat_type)       :: w, z
+    type(psb_z_vect_type)       :: dv
+    complex(psb_dpk_), allocatable :: d(:)
+
+  contains
+    procedure, pass(sv) :: cnv     => amg_z_base_ainv_solver_cnv
+    procedure, pass(sv) :: dump    => amg_z_base_ainv_solver_dmp
+    procedure, pass(sv) :: apply_v => amg_z_base_ainv_solver_apply_vect
+    procedure, pass(sv) :: apply_a => amg_z_base_ainv_solver_apply
+    procedure, pass(sv) :: free    => amg_z_base_ainv_solver_free
+    procedure, pass(sv) :: sizeof  => z_base_ainv_solver_sizeof
+    procedure, pass(sv) :: get_nzeros => z_base_ainv_get_nzeros
+    procedure, nopass   :: get_wrksz => z_base_ainv_get_wrksize
+    procedure, pass(sv) :: update_a => amg_z_base_ainv_update_a
+    generic, public     :: update => update_a
+  end type amg_z_base_ainv_solver_type
+
+  private ::  z_base_ainv_solver_sizeof, &
+       & z_base_ainv_get_nzeros, z_base_ainv_get_wrksize
+
+
+  interface
+    subroutine amg_z_base_ainv_solver_cnv(sv,info,amold,vmold,imold)
+      import :: psb_z_base_sparse_mat, psb_z_base_vect_type, psb_dpk_, &
+       & amg_z_base_ainv_solver_type, psb_ipk_, psb_i_base_vect_type
+      Implicit None
+      ! Arguments
+      class(amg_z_base_ainv_solver_type), intent(inout)  :: sv
+      integer(psb_ipk_), intent(out)                     :: info
+      class(psb_z_base_sparse_mat), intent(in), optional :: amold
+      class(psb_z_base_vect_type), intent(in), optional  :: vmold
+      class(psb_i_base_vect_type), intent(in), optional  :: imold
+    end subroutine amg_z_base_ainv_solver_cnv
+  end interface
+
+  interface
+    subroutine amg_z_base_ainv_update_a(sv,x,desc_data,info)
+      import :: psb_desc_type, psb_dpk_,amg_z_base_ainv_solver_type, psb_z_vect_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_z_base_ainv_solver_type), intent(inout) :: sv
+      complex(psb_dpk_),intent(in)            :: x(:)
+      integer(psb_ipk_), intent(out)       :: info
+    end subroutine amg_z_base_ainv_update_a
+  end interface
+
+  interface
+    subroutine amg_z_base_ainv_solver_apply(alpha,sv,x,beta,y,desc_data,&
+         & trans,work,info,init,initu)
+      import :: psb_desc_type, psb_dpk_,amg_z_base_ainv_solver_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_z_base_ainv_solver_type), intent(inout) :: sv
+      complex(psb_dpk_),intent(inout)         :: x(:)
+      complex(psb_dpk_),intent(inout)         :: y(:)
+      complex(psb_dpk_),intent(in)            :: alpha,beta
+      character(len=1),intent(in)          :: trans
+      complex(psb_dpk_),target, intent(inout) :: work(:)
+      integer(psb_ipk_), intent(out)       :: info
+      character, intent(in), optional      :: init
+      complex(psb_dpk_),intent(inout), optional :: initu(:)
+    end subroutine amg_z_base_ainv_solver_apply
+  end interface
+
+  interface
+    subroutine amg_z_base_ainv_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
+         &  trans,work,wv,info,init,initu)
+      import :: psb_desc_type, psb_dpk_,amg_z_base_ainv_solver_type, psb_z_vect_type, psb_ipk_
+      type(psb_desc_type), intent(in)      :: desc_data
+      class(amg_z_base_ainv_solver_type), intent(inout) :: sv
+      type(psb_z_vect_type),intent(inout)  :: x
+      type(psb_z_vect_type),intent(inout)  :: y
+      complex(psb_dpk_),intent(in)            :: alpha,beta
+      character(len=1),intent(in)          :: trans
+      complex(psb_dpk_),target, intent(inout) :: work(:)
+      type(psb_z_vect_type),intent(inout)  :: wv(:)
+      integer(psb_ipk_), intent(out)       :: info
+      character, intent(in), optional      :: init
+      type(psb_z_vect_type),intent(inout), optional   :: initu
+    end subroutine amg_z_base_ainv_solver_apply_vect
+  end interface
+
+
+  interface
+    subroutine amg_z_base_ainv_solver_free(sv,info)
+      import :: psb_desc_type, psb_zspmat_type,  psb_z_base_sparse_mat, &
+           & psb_z_vect_type, psb_z_base_vect_type, psb_dpk_, amg_z_base_ainv_solver_type, psb_ipk_
+      Implicit None
+
+      ! Arguments
+      class(amg_z_base_ainv_solver_type), intent(inout) :: sv
+      integer(psb_ipk_), intent(out)                    :: info
+    end subroutine amg_z_base_ainv_solver_free
+  end interface
+
+  interface
+    subroutine amg_z_base_ainv_solver_dmp(sv,desc,level,info,prefix,head,solver,global_num)
+      import :: psb_desc_type, psb_zspmat_type,  psb_z_base_sparse_mat, &
+           & psb_z_vect_type, psb_z_base_vect_type, psb_dpk_, amg_z_base_ainv_solver_type, psb_ipk_
+
+      implicit none
+      class(amg_z_base_ainv_solver_type), intent(in) :: sv
+      type(psb_desc_type), intent(in)        :: desc
+      integer(psb_ipk_), intent(in)          :: level
+      integer(psb_ipk_), intent(out)         :: info
+      character(len=*), intent(in), optional :: prefix, head
+      logical, optional, intent(in)    :: solver, global_num
+    end subroutine amg_z_base_ainv_solver_dmp
+  end interface
+
+contains
+
+  function z_base_ainv_get_nzeros(sv) result(val)
+    implicit none
+    ! Arguments
+    class(amg_z_base_ainv_solver_type), intent(in) :: sv
+    integer(psb_epk_) :: val
+    integer             :: i
+
+    val = 0
+    val = val + sv%dv%get_nrows()
+    val = val + sv%w%get_nzeros()
+    val = val + sv%z%get_nzeros()
+
+    return
+  end function z_base_ainv_get_nzeros
+
+  function z_base_ainv_solver_sizeof(sv) result(val)
+    implicit none
+    ! Arguments
+    class(amg_z_base_ainv_solver_type), intent(in) :: sv
+    integer(psb_epk_) :: val
+    integer             :: i
+
+    val = 2*psb_sizeof_ip + psb_sizeof_dp
+    val = val + sv%dv%sizeof()
+    val = val + sv%w%sizeof()
+    val = val + sv%z%sizeof()
+
+    return
+  end function z_base_ainv_solver_sizeof
+
+  function z_base_ainv_get_wrksize() result(val)
+    implicit none
+    integer(psb_ipk_)  :: val
+
+    val = 2
+  end function z_base_ainv_get_wrksize
+
+end module amg_z_base_ainv_mod

amgprec/impl/solver/Makefile

@@ -191,7 +191,60 @@ amg_z_ilu_solver_dmp.o \
 amg_z_mumps_solver_apply.o \
 amg_z_mumps_solver_apply_vect.o \
 amg_z_mumps_solver_bld.o \
-
+amg_s_ainv_solver_bld.o \
+amg_s_ainv_solver_check.o \
+amg_s_ainv_solver_clone.o \
+amg_s_ainv_solver_csetc.o \
+amg_s_ainv_solver_cseti.o \
+amg_s_ainv_solver_csetr.o \
+amg_s_ainv_solver_descr.o \
+amg_s_ainv_solver_setc.o \
+amg_s_ainv_solver_seti.o \
+amg_s_ainv_solver_setr.o \
+amg_d_ainv_solver_bld.o \
+amg_d_ainv_solver_check.o \
+amg_d_ainv_solver_clone.o \
+amg_d_ainv_solver_csetc.o \
+amg_d_ainv_solver_cseti.o \
+amg_d_ainv_solver_csetr.o \
+amg_d_ainv_solver_descr.o \
+amg_d_ainv_solver_setc.o \
+amg_d_ainv_solver_seti.o \
+amg_d_ainv_solver_setr.o \
+amg_c_ainv_solver_bld.o \
+amg_c_ainv_solver_check.o \
+amg_c_ainv_solver_clone.o \
+amg_c_ainv_solver_csetc.o \
+amg_c_ainv_solver_cseti.o \
+amg_c_ainv_solver_csetr.o \
+amg_c_ainv_solver_descr.o \
+amg_c_ainv_solver_setc.o \
+amg_c_ainv_solver_seti.o \
+amg_c_ainv_solver_setr.o \
+amg_s_base_ainv_solver_apply_vect.o \
+amg_s_base_ainv_solver_apply.o \
+amg_s_base_ainv_solver_cnv.o \
+amg_s_base_ainv_solver_dmp.o \
+amg_s_base_ainv_solver_free.o \
+amg_s_base_ainv_update_a.o \
+amg_d_base_ainv_solver_apply_vect.o \
+amg_d_base_ainv_solver_apply.o \
+amg_d_base_ainv_solver_cnv.o \
+amg_d_base_ainv_solver_dmp.o \
+amg_d_base_ainv_solver_free.o \
+amg_d_base_ainv_update_a.o \
+amg_c_base_ainv_solver_apply_vect.o \
+amg_c_base_ainv_solver_apply.o \
+amg_c_base_ainv_solver_cnv.o \
+amg_c_base_ainv_solver_dmp.o \
+amg_c_base_ainv_solver_free.o \
+amg_c_base_ainv_update_a.o \
+amg_z_base_ainv_solver_apply_vect.o \
+amg_z_base_ainv_solver_apply.o \
+amg_z_base_ainv_solver_cnv.o \
+amg_z_base_ainv_solver_dmp.o \
+amg_z_base_ainv_solver_free.o \
+amg_z_base_ainv_update_a.o
 
 LIBNAME=libamg_prec.a
 
@@ -208,4 +261,3 @@ veryclean: clean
 
 clean:
 	/bin/rm -f $(OBJS) $(LOCAL_MODS)
-

amgprec/impl/solver/amg_c_ainv_solver_bld.f90

@@ -0,0 +1,99 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_ainv_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
+
+
+  use psb_base_mod
+  use psb_c_ainv_fact_mod
+  use amg_prec_mod
+  use amg_c_ainv_solver, amg_protect_name => amg_c_ainv_solver_bld
+
+  Implicit None
+
+  ! Arguments
+  type(psb_cspmat_type), intent(in), target    :: a
+  Type(psb_desc_type), Intent(inout)           :: desc_a
+  class(amg_c_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)                      :: info
+  type(psb_cspmat_type), intent(in), target, optional :: b
+  class(psb_c_base_sparse_mat), intent(in), optional  :: amold
+  class(psb_c_base_vect_type), intent(in), optional   :: vmold
+  class(psb_i_base_vect_type), intent(in), optional   :: imold
+  ! Local variables
+  integer(psb_ipk_)  :: n_row,n_col, nrow_a, nztota
+  complex(psb_spk_), pointer :: ww(:), aux(:), tx(:),ty(:)
+  integer(psb_ipk_)  :: np,me,i, err_act, debug_unit, debug_level
+  type(psb_ctxt_type) :: ctxt
+  character(len=20)  :: name='amg_c_ainv_solver_bld', ch_err
+
+  info=psb_success_
+  call psb_erractionsave(err_act)
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+  ctxt       = desc_a%get_context()
+  call psb_info(ctxt, me, np)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),' start'
+
+  call psb_c_ainv_bld(a,sv%alg,sv%fill_in,sv%thresh,&
+       & sv%w,sv%d,sv%z,desc_a,info,b,iscale=amg_ilu_scale_maxval_)
+
+  if ((info == psb_success_) .and.present(amold)) then
+    call sv%w%set_asb()
+    call sv%w%trim()
+    call sv%z%set_asb()
+    call sv%z%trim()
+    call sv%w%cscnv(info,mold=amold)
+    if (info == psb_success_) &
+         & call sv%z%cscnv(info,mold=amold)
+  end if
+
+  if (info == psb_success_) &
+       & call sv%dv%bld(sv%d,mold=vmold)
+
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name)
+    goto 9999
+  end if
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),' end'
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_ainv_solver_bld

amgprec/impl/solver/amg_c_ainv_solver_check.f90

@@ -0,0 +1,65 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_ainv_solver_check(sv,info)
+
+
+  use psb_base_mod
+  use amg_c_ainv_solver, amg_protect_name => amg_c_ainv_solver_check
+
+  Implicit None
+
+  ! Arguments
+  class(amg_c_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_c_ainv_solver_check'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  call amg_check_def(sv%fill_in,&
+       & 'Nzmin',ione,is_positive_nz_min)
+  call amg_check_def(sv%thresh,&
+       & 'Eps',szero,is_legal_s_fact_thrs)
+
+  if (info /= psb_success_) goto 9999
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_ainv_solver_check

amgprec/impl/solver/amg_c_ainv_solver_clone.f90

@@ -0,0 +1,91 @@
+!
+!
+!                             AMG4PSBLAS version 1.0
+!    MultiLevel Domain Decomposition Parallel Preconditioners Package
+!               based on PSBLAS (Parallel Sparse BLAS version 3.0)
+!
+!    (C) Copyright 2008,2009,2010,2010,2012
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!                        Alfredo Buttari      CNRS-IRIT, Toulouse
+!                        Pasqua D'Ambra       ICAR-CNR, Naples
+!                        Daniela di Serafino  Second University of Naples
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_ainv_solver_clone(sv,svout,info)
+
+  use psb_base_mod
+  use amg_c_ainv_solver, amg_protect_name => amg_c_ainv_solver_clone
+
+  Implicit None
+
+  ! Arguments
+  class(amg_c_ainv_solver_type), intent(inout)              :: sv
+  class(amg_c_base_solver_type), allocatable, intent(inout) :: svout
+  integer(psb_ipk_), intent(out)                            :: info
+  ! Local variables
+  integer(psb_ipk_) :: err_act
+
+
+  info=psb_success_
+  call psb_erractionsave(err_act)
+
+  if (allocated(svout)) then
+    call svout%free(info)
+    if (info == psb_success_) deallocate(svout, stat=info)
+  end if
+  if (info == psb_success_) &
+       & allocate(amg_c_ainv_solver_type :: svout, stat=info)
+  if (info /= 0) then
+    info = psb_err_alloc_dealloc_
+    goto 9999
+  end if
+  select type(svo => svout)
+  type is (amg_c_ainv_solver_type)
+    svo%alg      = sv%alg
+    svo%fill_in  = sv%fill_in
+    svo%thresh   = sv%thresh
+    call psb_safe_ab_cpy(sv%d,svo%d,info)
+    if (info == psb_success_) &
+         & call sv%dv%clone(svo%dv,info)
+    if (info == psb_success_) &
+         & call sv%w%clone(svo%w,info)
+    if (info == psb_success_) &
+         & call sv%z%clone(svo%z,info)
+
+  class default
+    info = psb_err_internal_error_
+  end select
+
+  if (info /= 0) goto 9999
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_ainv_solver_clone

amgprec/impl/solver/amg_c_ainv_solver_csetc.f90

@@ -0,0 +1,79 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_ainv_solver_csetc(sv,what,val,info,idx)
+
+
+  use psb_base_mod
+  use amg_c_ainv_solver, amg_protect_name => amg_c_ainv_solver_csetc
+
+  Implicit None
+
+  ! Arguments
+  class(amg_c_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  character(len=*), intent(in)                 :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_ ) :: err_act, ival
+  character(len=20)  :: name='amg_c_ainv_solver_setc'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+!!$  select case(psb_toupper(trim(what)))
+!!$  case('AINV_ALG')
+!!$    sv%alg  = sv%stringval(val)
+!!$  case default
+!!$    call sv%mld_d_base_solver_type%set(what,val,info)
+!!$  end select
+  ival =  sv%stringval(val)
+
+  if (ival >=0) then
+    call sv%set(what,ival,info)
+  end if
+
+  if (info /= psb_success_) then
+    info = psb_err_from_subroutine_
+    call psb_errpush(info, name)
+    goto 9999
+  end if
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_ainv_solver_csetc

amgprec/impl/solver/amg_c_ainv_solver_cseti.f90

@@ -0,0 +1,69 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_ainv_solver_cseti(sv,what,val,info,idx)
+
+  use psb_base_mod
+  use amg_c_ainv_solver, amg_protect_name => amg_c_ainv_solver_cseti
+
+  Implicit None
+
+  ! Arguments
+  class(amg_c_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  integer(psb_ipk_), intent(in)                :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_c_ainv_solver_cseti'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  select case(psb_toupper(trim(what)))
+  case('SUB_FILLIN')
+    sv%fill_in  = val
+  case('AINV_ALG')
+    sv%alg      = val
+  case default
+    call sv%amg_c_base_solver_type%set(what,val,info)
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_ainv_solver_cseti

amgprec/impl/solver/amg_c_ainv_solver_csetr.f90

@@ -0,0 +1,67 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_ainv_solver_csetr(sv,what,val,info,idx)
+
+  use psb_base_mod
+  use amg_c_ainv_solver, amg_protect_name => amg_c_ainv_solver_csetr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_c_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  real(psb_spk_), intent(in)                   :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_c_ainv_solver_csetr'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  select case(psb_toupper(what))
+  case('SUB_ILUTHRS')
+    sv%thresh = val
+  case default
+    call sv%amg_c_base_solver_type%set(what,val,info)
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_ainv_solver_csetr

amgprec/impl/solver/amg_c_ainv_solver_descr.f90

@@ -0,0 +1,73 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_ainv_solver_descr(sv,info,iout,coarse)
+
+
+  use psb_base_mod
+  use amg_c_ainv_solver, amg_protect_name => amg_c_ainv_solver_descr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_c_ainv_solver_type), intent(in) :: sv
+  integer(psb_ipk_), intent(out)            :: info
+  integer(psb_ipk_), intent(in), optional   :: iout
+  logical, intent(in), optional             :: coarse
+
+  ! Local variables
+  integer(psb_ipk_)      :: err_act
+  integer(psb_ipk_)      :: ictxt, me, np
+  character(len=20), parameter :: name='amg_c_ainv_solver_descr'
+  integer(psb_ipk_)      :: iout_
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+  if (present(iout)) then
+    iout_ = iout
+  else
+    iout_ = 6
+  endif
+
+  write(iout_,*) '  AINV: Approximate Inverse with sparse biconjugation '
+  write(iout_,*) '  Algorithm variant      : ',sv%algname(sv%alg)
+  write(iout_,*) '  Fill level             : ',sv%fill_in
+  write(iout_,*) '  Fill threshold         : ',sv%thresh
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_ainv_solver_descr

amgprec/impl/solver/amg_c_ainv_solver_setc.f90

@@ -0,0 +1,71 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_ainv_solver_setc(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_c_ainv_solver, amg_protect_name => amg_c_ainv_solver_setc
+
+  Implicit None
+
+  ! Arguments
+  class(amg_c_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  character(len=*), intent(in)                 :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act, ival
+  character(len=20)  :: name='amg_c_ainv_solver_setc'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  ival =  sv%stringval(val)
+  if (ival >=0) then
+    call sv%set(what,ival,info)
+  end if
+
+  if (info /= psb_success_) then
+    info = psb_err_from_subroutine_
+    call psb_errpush(info, name)
+    goto 9999
+  end if
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_ainv_solver_setc

amgprec/impl/solver/amg_c_ainv_solver_seti.f90

@@ -0,0 +1,70 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_ainv_solver_seti(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_c_ainv_solver, amg_protect_name => amg_c_ainv_solver_seti
+
+  Implicit None
+
+  ! Arguments
+  class(amg_c_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  integer(psb_ipk_), intent(in)                :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act
+  character(len=20)  :: name='amg_c_ainv_solver_seti'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  select case(what)
+  case(amg_sub_fillin_)
+    sv%fill_in  = val
+  case(amg_ainv_alg_)
+    sv%alg      = val
+  case default
+!!$      write(0,*) name,': Error: invalid WHAT'
+!!$      info = -2
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_ainv_solver_seti

amgprec/impl/solver/amg_c_ainv_solver_setr.f90

@@ -0,0 +1,69 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_ainv_solver_setr(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_c_ainv_solver, amg_protect_name => amg_c_ainv_solver_setr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_c_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  real(psb_spk_), intent(in)                   :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act
+  character(len=20)  :: name='amg_c_ainv_solver_setr'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  select case(what)
+  case(amg_sub_iluthrs_)
+    sv%thresh = val
+  case default
+!!$      write(0,*) name,': Error: invalid WHAT'
+!!$      info = -2
+!!$      goto 9999
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_ainv_solver_setr

amgprec/impl/solver/amg_c_base_ainv_solver_apply.f90

@@ -0,0 +1,153 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_base_ainv_solver_apply(alpha,sv,x,beta,y,desc_data,&
+     & trans,work,info,init,initu)
+
+  use psb_base_mod
+  use amg_c_base_ainv_mod, amg_protect_name => amg_c_base_ainv_solver_apply
+  implicit none
+  type(psb_desc_type), intent(in)        :: desc_data
+  class(amg_c_base_ainv_solver_type), intent(inout) :: sv
+  complex(psb_spk_),intent(inout)           :: x(:)
+  complex(psb_spk_),intent(inout)           :: y(:)
+  complex(psb_spk_),intent(in)              :: alpha,beta
+  character(len=1),intent(in)            :: trans
+  complex(psb_spk_),target, intent(inout)   :: work(:)
+  integer(psb_ipk_), intent(out)         :: info
+  character, intent(in), optional        :: init
+  complex(psb_spk_),intent(inout), optional :: initu(:)
+  !
+  integer(psb_ipk_)  :: n_row,n_col
+  complex(psb_spk_), pointer :: ww(:), aux(:), tx(:),ty(:)
+  integer(psb_ipk_)  :: np,me,i, err_act
+  type(psb_ctxt_type)   :: ctxt
+  character          :: trans_
+  character(len=20)  :: name='d_base_ainv_solver_apply'
+
+  call psb_erractionsave(err_act)
+
+  info = psb_success_
+
+  trans_ = psb_toupper(trans)
+  select case(trans_)
+  case('N')
+  case('T','C')
+  case default
+    call psb_errpush(psb_err_iarg_invalid_i_,name)
+    goto 9999
+  end select
+  !
+  ! For non-iterative solvers, init and initu are ignored.
+  !
+
+  n_row = psb_cd_get_local_rows(desc_data)
+  n_col = psb_cd_get_local_cols(desc_data)
+
+  if (n_col <= size(work)) then
+    ww => work(1:n_col)
+    if ((4*n_col+n_col) <= size(work)) then
+      aux => work(n_col+1:)
+    else
+      allocate(aux(4*n_col),stat=info)
+      if (info /= psb_success_) then
+        info=psb_err_alloc_request_
+        call psb_errpush(info,name,i_err=(/4*n_col/),&
+             & a_err='real(psb_dpk_)')
+        goto 9999
+      end if
+    endif
+  else
+    allocate(ww(n_col),aux(4*n_col),stat=info)
+    if (info /= psb_success_) then
+      info=psb_err_alloc_request_
+      call psb_errpush(info,name,i_err=(/5*n_col/),&
+           & a_err='real(psb_dpk_)')
+      goto 9999
+    end if
+  endif
+
+  select case(trans_)
+  case('N')
+    call psb_spmm(cone,sv%w,x,czero,ww,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+    ww(1:n_row) = ww(1:n_row) * sv%d(1:n_row)
+    if (info == psb_success_) &
+         & call psb_spmm(alpha,sv%z,ww,beta,y,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+
+  case('T','C')
+    call psb_spmm(cone,sv%z,x,czero,ww,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+    ww(1:n_row) = ww(1:n_row) * sv%d(1:n_row)
+    if (info == psb_success_) &
+         & call psb_spmm(alpha,sv%w,ww,beta,y,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+
+  case default
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Invalid TRANS in ainv subsolve')
+    goto 9999
+  end select
+
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Error in subsolve')
+    goto 9999
+  endif
+
+  if (n_col <= size(work)) then
+    if ((4*n_col+n_col) <= size(work)) then
+    else
+      deallocate(aux,stat=info)
+    endif
+  else
+    deallocate(ww,aux,stat=info)
+  endif
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Deallocate')
+    goto 9999
+  endif
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_base_ainv_solver_apply

amgprec/impl/solver/amg_c_base_ainv_solver_apply_vect.f90

@@ -0,0 +1,167 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_base_ainv_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
+     & trans,work,wv,info,init,initu)
+
+  use psb_base_mod
+  use amg_c_base_ainv_mod, amg_protect_name => amg_c_base_ainv_solver_apply_vect
+  implicit none
+  type(psb_desc_type), intent(in)               :: desc_data
+  class(amg_c_base_ainv_solver_type), intent(inout) :: sv
+  type(psb_c_vect_type), intent(inout)          :: x
+  type(psb_c_vect_type), intent(inout)          :: y
+  complex(psb_spk_), intent(in)                    :: alpha,beta
+  character(len=1), intent(in)                  :: trans
+  complex(psb_spk_),target, intent(inout)          :: work(:)
+  type(psb_c_vect_type),intent(inout)           :: wv(:)
+  integer(psb_ipk_), intent(out)                :: info
+  character, intent(in), optional               :: init
+  type(psb_c_vect_type),intent(inout), optional :: initu
+  !
+  integer(psb_ipk_)     :: n_row,n_col
+  complex(psb_spk_), pointer :: ww(:), aux(:)
+  type(psb_c_vect_type) :: tx,ty
+  integer(psb_ipk_)     :: np,me,i, err_act
+  type(psb_ctxt_type)   :: ctxt
+  character             :: trans_
+  character(len=20)     :: name='d_base_ainv_solver_apply'
+
+  call psb_erractionsave(err_act)
+
+  info = psb_success_
+
+  trans_ = psb_toupper(trans)
+  select case(trans_)
+  case('N')
+  case('T','C')
+  case default
+    call psb_errpush(psb_err_iarg_invalid_i_,name)
+    goto 9999
+  end select
+  !
+  ! For non-iterative solvers, init and initu are ignored.
+  !
+
+  n_row = psb_cd_get_local_rows(desc_data)
+  n_col = psb_cd_get_local_cols(desc_data)
+
+  if (n_col <= size(work)) then
+    ww => work(1:n_col)
+    if ((4*n_col+n_col) <= size(work)) then
+      aux => work(n_col+1:)
+    else
+      allocate(aux(4*n_col),stat=info)
+      if (info /= psb_success_) then
+        info=psb_err_alloc_request_
+        call psb_errpush(info,name,i_err=(/4*n_col/),&
+             & a_err='real(psb_dpk_)')
+        goto 9999
+      end if
+    endif
+  else
+    allocate(ww(n_col),aux(4*n_col),stat=info)
+    if (info /= psb_success_) then
+      info=psb_err_alloc_request_
+      call psb_errpush(info,name,i_err=(/5*n_col/),&
+           & a_err='real(psb_dpk_)')
+      goto 9999
+    end if
+  endif
+
+  if (size(wv) < 2) then
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,&
+         & a_err='invalid wv size')
+    goto 9999
+  end if
+
+
+  associate(tx => wv(1), ty => wv(2))
+
+    select case(trans_)
+    case('N')
+      call psb_spmm(cone,sv%w,x,czero,tx,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+      if (info == psb_success_) call ty%mlt(cone,sv%dv,tx,czero,info)
+      if (info == psb_success_) &
+           & call psb_spmm(alpha,sv%z,ty,beta,y,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+
+    case('T','C')
+      call psb_spmm(cone,sv%z,x,czero,tx,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+      if (info == psb_success_) call ty%mlt(cone,sv%dv,tx,czero,info)
+      if (info == psb_success_) &
+           & call psb_spmm(alpha,sv%w,ty,beta,y,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+
+    case default
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Invalid TRANS in ainv subsolve')
+      goto 9999
+    end select
+
+
+    if (info /= psb_success_) then
+
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Error in subsolve')
+      goto 9999
+    endif
+
+  end associate
+
+  if (n_col <= size(work)) then
+    if ((4*n_col+n_col) <= size(work)) then
+    else
+      deallocate(aux,stat=info)
+    endif
+  else
+    deallocate(ww,aux,stat=info)
+  endif
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Deallocate')
+    goto 9999
+  endif
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_base_ainv_solver_apply_vect

amgprec/impl/solver/amg_c_base_ainv_solver_cnv.f90

@@ -0,0 +1,63 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_base_ainv_solver_cnv(sv,info,amold,vmold,imold)
+  use psb_base_mod
+  use amg_c_base_ainv_mod, amg_protect_name => amg_c_base_ainv_solver_cnv
+  Implicit None
+  ! Arguments
+  class(amg_c_base_ainv_solver_type), intent(inout)  :: sv
+  integer(psb_ipk_), intent(out)                     :: info
+  class(psb_c_base_sparse_mat), intent(in), optional :: amold
+  class(psb_c_base_vect_type), intent(in), optional  :: vmold
+  class(psb_i_base_vect_type), intent(in), optional  :: imold
+
+  !local
+  integer(psb_ipk_)  :: i, j, il1, iln, lname, lev
+  integer(psb_ipk_)  :: iam, np
+  type(psb_ctxt_type)   :: ctxt
+  character(len=80)  :: prefix_
+  character(len=120) :: fname ! len should be at least 20 more than
+  logical :: solver_
+  !  len of prefix_
+
+  info = 0
+
+  if (present(amold)) then
+    call sv%w%cscnv(info,mold=amold)
+    call sv%z%cscnv(info,mold=amold)
+  end if
+  call sv%dv%cnv(mold=vmold)
+
+end subroutine amg_c_base_ainv_solver_cnv

amgprec/impl/solver/amg_c_base_ainv_solver_dmp.f90

@@ -0,0 +1,93 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_base_ainv_solver_dmp(sv,desc,level,info,prefix,head,solver,global_num)
+
+  use psb_base_mod
+  use amg_c_base_ainv_mod, amg_protect_name => amg_c_base_ainv_solver_dmp
+  implicit none
+  class(amg_c_base_ainv_solver_type), intent(in) :: sv
+  type(psb_desc_type), intent(in)             :: desc
+  integer(psb_ipk_), intent(in)              :: level
+  integer(psb_ipk_), intent(out)             :: info
+  character(len=*), intent(in), optional     :: prefix, head
+  logical, optional, intent(in)              :: solver, global_num
+  !
+  integer(psb_ipk_)  :: i, j, il1, iln, lname, lev
+  integer(psb_ipk_)  :: iam, np
+  type(psb_ctxt_type)   :: ctxt
+  character(len=80)  :: prefix_
+  character(len=120) :: fname ! len should be at least 20 more than
+  logical :: solver_, global_num_
+  !  len of prefix_
+
+  info = 0
+
+  if (present(prefix)) then
+    prefix_ = trim(prefix(1:min(len(prefix),len(prefix_))))
+  else
+    prefix_ = "dump_ainv_d"
+  end if
+
+  ctxt = desc%get_context()
+  call psb_info(ctxt,iam,np)
+
+  if (present(solver)) then
+    solver_ = solver
+  else
+    solver_ = .false.
+  end if
+  if (present(global_num)) then
+    global_num_ = global_num
+  else
+    global_num_ = .false.
+  end if
+  lname = len_trim(prefix_)
+  fname = trim(prefix_)
+  write(fname(lname+1:lname+5),'(a,i3.3)') '_p',iam
+  lname = lname + 5
+
+  if (solver_) then
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_wmat.mtx'
+    if (sv%w%is_asb()) &
+         & call sv%w%print(fname,head=head)
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_diag.mtx'
+    if (allocated(sv%d)) &
+         & call psb_geprt(fname,sv%d,head=head)
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_zmat.mtx'
+    if (sv%z%is_asb()) &
+         & call sv%z%print(fname,head=head)
+  end if
+
+end subroutine amg_c_base_ainv_solver_dmp

amgprec/impl/solver/amg_c_base_ainv_solver_free.f90

@@ -0,0 +1,70 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_base_ainv_solver_free(sv,info)
+
+  use psb_base_mod
+  use amg_c_base_ainv_mod, amg_protect_name => amg_c_base_ainv_solver_free
+
+  Implicit None
+
+  ! Arguments
+  class(amg_c_base_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)                    :: info
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_c_base_ainv_solver_free'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+  call sv%clear_data(info)
+
+  if (allocated(sv%d)) then
+    deallocate(sv%d,stat=info)
+    if (info /= psb_success_) then
+      info = psb_err_alloc_dealloc_
+      call psb_errpush(info,name)
+      goto 9999
+    end if
+  end if
+  call sv%w%free()
+  call sv%z%free()
+  call sv%dv%free(info)
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_c_base_ainv_solver_free

amgprec/impl/solver/amg_c_base_ainv_update_a.f90

@@ -0,0 +1,81 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_c_base_ainv_update_a(sv,x,desc_data,info)
+  use amg_c_base_ainv_mod, amg_protect_name => amg_c_base_ainv_update_a
+  use psb_base_mod
+
+  implicit none
+
+  type(psb_desc_type), intent(in)            :: desc_data
+  class(amg_c_base_ainv_solver_type), intent(inout) :: sv
+  complex(psb_spk_),intent(in)                  :: x(:)
+  integer(psb_ipk_), intent(out)             :: info
+
+  ! Local variables
+  complex(psb_spk_), allocatable   :: dd(:), ee(:)
+  integer(psb_ipk_) :: nrows, ncols, i, j, k, nzr, nzc, ir, ic
+
+  type(psb_c_csc_sparse_mat) :: ac
+  type(psb_c_csr_sparse_mat) :: ar
+
+  dd = sv%dv%get_vect()
+  if (size(x)<size(dd)) then
+    write(0,*) 'Wrong size in update',size(x),size(dd)
+    info = -1
+    return
+  end if
+
+  ee = x(1:size(dd))
+  call sv%z%cp_to(ac)
+  call sv%w%cp_to(ar)
+  ! Compute diag(W ee Z)
+  ! First  ee Z
+  call ac%scal(ee,info,side='L')
+  ! Then  diag(W (ee Z))
+  do i=1,ar%get_nrows()
+    ir  = ar%irp(i);  nzr = ar%irp(i+1)-ar%irp(i)
+    ic  = ac%icp(i);  nzc = ac%icp(i+1)-ac%icp(i)
+    ee(i) = psb_spdot_srtd(&
+         & nzr,ar%ja(ir:ir+nzr-1),ar%val(ir:ir+nzr-1),&
+         & nzc,ac%ia(ic:ic+nzc-1),ac%val(ic:ic+nzc-1))
+  end do
+  ! Now invert diagonal
+  dd = done/dd
+  dd = dd + ee
+  dd = done/dd
+  sv%d = dd
+  call sv%dv%bld(dd,mold=sv%dv%v)
+
+end subroutine amg_c_base_ainv_update_a

amgprec/impl/solver/amg_d_ainv_solver_bld.f90

@@ -0,0 +1,99 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_ainv_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
+
+
+  use psb_base_mod
+  use psb_d_ainv_fact_mod
+  use amg_prec_mod
+  use amg_d_ainv_solver, amg_protect_name => amg_d_ainv_solver_bld
+
+  Implicit None
+
+  ! Arguments
+  type(psb_dspmat_type), intent(in), target    :: a
+  Type(psb_desc_type), Intent(inout)           :: desc_a
+  class(amg_d_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)                      :: info
+  type(psb_dspmat_type), intent(in), target, optional :: b
+  class(psb_d_base_sparse_mat), intent(in), optional  :: amold
+  class(psb_d_base_vect_type), intent(in), optional   :: vmold
+  class(psb_i_base_vect_type), intent(in), optional   :: imold
+  ! Local variables
+  integer(psb_ipk_)  :: n_row,n_col, nrow_a, nztota
+  real(psb_dpk_), pointer :: ww(:), aux(:), tx(:),ty(:)
+  integer(psb_ipk_)  :: np,me,i, err_act, debug_unit, debug_level
+  type(psb_ctxt_type) :: ctxt
+  character(len=20)  :: name='amg_d_ainv_solver_bld', ch_err
+
+  info=psb_success_
+  call psb_erractionsave(err_act)
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+  ctxt       = desc_a%get_context()
+  call psb_info(ctxt, me, np)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),' start'
+
+  call psb_d_ainv_bld(a,sv%alg,sv%fill_in,sv%thresh,&
+       & sv%w,sv%d,sv%z,desc_a,info,b,iscale=amg_ilu_scale_maxval_)
+
+  if ((info == psb_success_) .and.present(amold)) then
+    call sv%w%set_asb()
+    call sv%w%trim()
+    call sv%z%set_asb()
+    call sv%z%trim()
+    call sv%w%cscnv(info,mold=amold)
+    if (info == psb_success_) &
+         & call sv%z%cscnv(info,mold=amold)
+  end if
+
+  if (info == psb_success_) &
+       & call sv%dv%bld(sv%d,mold=vmold)
+
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name)
+    goto 9999
+  end if
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),' end'
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_ainv_solver_bld

amgprec/impl/solver/amg_d_ainv_solver_check.f90

@@ -0,0 +1,65 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_ainv_solver_check(sv,info)
+
+
+  use psb_base_mod
+  use amg_d_ainv_solver, amg_protect_name => amg_d_ainv_solver_check
+
+  Implicit None
+
+  ! Arguments
+  class(amg_d_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_d_ainv_solver_check'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  call amg_check_def(sv%fill_in,&
+       & 'Nzmin',ione,is_positive_nz_min)
+  call amg_check_def(sv%thresh,&
+       & 'Eps',dzero,is_legal_d_fact_thrs)
+
+  if (info /= psb_success_) goto 9999
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_ainv_solver_check

amgprec/impl/solver/amg_d_ainv_solver_clone.f90

@@ -0,0 +1,91 @@
+!
+!
+!                             AMG4PSBLAS version 1.0
+!    MultiLevel Domain Decomposition Parallel Preconditioners Package
+!               based on PSBLAS (Parallel Sparse BLAS version 3.0)
+!
+!    (C) Copyright 2008,2009,2010,2010,2012
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!                        Alfredo Buttari      CNRS-IRIT, Toulouse
+!                        Pasqua D'Ambra       ICAR-CNR, Naples
+!                        Daniela di Serafino  Second University of Naples
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_ainv_solver_clone(sv,svout,info)
+
+  use psb_base_mod
+  use amg_d_ainv_solver, amg_protect_name => amg_d_ainv_solver_clone
+
+  Implicit None
+
+  ! Arguments
+  class(amg_d_ainv_solver_type), intent(inout)              :: sv
+  class(amg_d_base_solver_type), allocatable, intent(inout) :: svout
+  integer(psb_ipk_), intent(out)                            :: info
+  ! Local variables
+  integer(psb_ipk_) :: err_act
+
+
+  info=psb_success_
+  call psb_erractionsave(err_act)
+
+  if (allocated(svout)) then
+    call svout%free(info)
+    if (info == psb_success_) deallocate(svout, stat=info)
+  end if
+  if (info == psb_success_) &
+       & allocate(amg_d_ainv_solver_type :: svout, stat=info)
+  if (info /= 0) then
+    info = psb_err_alloc_dealloc_
+    goto 9999
+  end if
+  select type(svo => svout)
+  type is (amg_d_ainv_solver_type)
+    svo%alg      = sv%alg
+    svo%fill_in  = sv%fill_in
+    svo%thresh   = sv%thresh
+    call psb_safe_ab_cpy(sv%d,svo%d,info)
+    if (info == psb_success_) &
+         & call sv%dv%clone(svo%dv,info)
+    if (info == psb_success_) &
+         & call sv%w%clone(svo%w,info)
+    if (info == psb_success_) &
+         & call sv%z%clone(svo%z,info)
+
+  class default
+    info = psb_err_internal_error_
+  end select
+
+  if (info /= 0) goto 9999
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_ainv_solver_clone

amgprec/impl/solver/amg_d_ainv_solver_csetc.f90

@@ -0,0 +1,79 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_ainv_solver_csetc(sv,what,val,info,idx)
+
+
+  use psb_base_mod
+  use amg_d_ainv_solver, amg_protect_name => amg_d_ainv_solver_csetc
+
+  Implicit None
+
+  ! Arguments
+  class(amg_d_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  character(len=*), intent(in)                 :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_ ) :: err_act, ival
+  character(len=20)  :: name='amg_d_ainv_solver_setc'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+!!$  select case(psb_toupper(trim(what)))
+!!$  case('AINV_ALG')
+!!$    sv%alg  = sv%stringval(val)
+!!$  case default
+!!$    call sv%mld_d_base_solver_type%set(what,val,info)
+!!$  end select
+  ival =  sv%stringval(val)
+
+  if (ival >=0) then
+    call sv%set(what,ival,info)
+  end if
+
+  if (info /= psb_success_) then
+    info = psb_err_from_subroutine_
+    call psb_errpush(info, name)
+    goto 9999
+  end if
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_ainv_solver_csetc

amgprec/impl/solver/amg_d_ainv_solver_cseti.f90

@@ -0,0 +1,69 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_ainv_solver_cseti(sv,what,val,info,idx)
+
+  use psb_base_mod
+  use amg_d_ainv_solver, amg_protect_name => amg_d_ainv_solver_cseti
+
+  Implicit None
+
+  ! Arguments
+  class(amg_d_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  integer(psb_ipk_), intent(in)                :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_d_ainv_solver_cseti'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  select case(psb_toupper(trim(what)))
+  case('SUB_FILLIN')
+    sv%fill_in  = val
+  case('AINV_ALG')
+    sv%alg      = val
+  case default
+    call sv%amg_d_base_solver_type%set(what,val,info)
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_ainv_solver_cseti

amgprec/impl/solver/amg_d_ainv_solver_csetr.f90

@@ -0,0 +1,67 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_ainv_solver_csetr(sv,what,val,info,idx)
+
+  use psb_base_mod
+  use amg_d_ainv_solver, amg_protect_name => amg_d_ainv_solver_csetr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_d_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  real(psb_dpk_), intent(in)                   :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_d_ainv_solver_csetr'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  select case(psb_toupper(what))
+  case('SUB_ILUTHRS')
+    sv%thresh = val
+  case default
+    call sv%amg_d_base_solver_type%set(what,val,info)
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_ainv_solver_csetr

amgprec/impl/solver/amg_d_ainv_solver_descr.f90

@@ -0,0 +1,73 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_ainv_solver_descr(sv,info,iout,coarse)
+
+
+  use psb_base_mod
+  use amg_d_ainv_solver, amg_protect_name => amg_d_ainv_solver_descr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_d_ainv_solver_type), intent(in) :: sv
+  integer(psb_ipk_), intent(out)            :: info
+  integer(psb_ipk_), intent(in), optional   :: iout
+  logical, intent(in), optional             :: coarse
+
+  ! Local variables
+  integer(psb_ipk_)      :: err_act
+  integer(psb_ipk_)      :: ictxt, me, np
+  character(len=20), parameter :: name='amg_d_ainv_solver_descr'
+  integer(psb_ipk_)      :: iout_
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+  if (present(iout)) then
+    iout_ = iout
+  else
+    iout_ = 6
+  endif
+
+  write(iout_,*) '  AINV: Approximate Inverse with sparse biconjugation '
+  write(iout_,*) '  Algorithm variant      : ',sv%algname(sv%alg)
+  write(iout_,*) '  Fill level             : ',sv%fill_in
+  write(iout_,*) '  Fill threshold         : ',sv%thresh
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_ainv_solver_descr

amgprec/impl/solver/amg_d_ainv_solver_setc.f90

@@ -0,0 +1,71 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_ainv_solver_setc(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_d_ainv_solver, amg_protect_name => amg_d_ainv_solver_setc
+
+  Implicit None
+
+  ! Arguments
+  class(amg_d_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  character(len=*), intent(in)                 :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act, ival
+  character(len=20)  :: name='amg_d_ainv_solver_setc'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  ival =  sv%stringval(val)
+  if (ival >=0) then
+    call sv%set(what,ival,info)
+  end if
+
+  if (info /= psb_success_) then
+    info = psb_err_from_subroutine_
+    call psb_errpush(info, name)
+    goto 9999
+  end if
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_ainv_solver_setc

amgprec/impl/solver/amg_d_ainv_solver_seti.f90

@@ -0,0 +1,70 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_ainv_solver_seti(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_d_ainv_solver, amg_protect_name => amg_d_ainv_solver_seti
+
+  Implicit None
+
+  ! Arguments
+  class(amg_d_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  integer(psb_ipk_), intent(in)                :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act
+  character(len=20)  :: name='amg_d_ainv_solver_seti'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  select case(what)
+  case(amg_sub_fillin_)
+    sv%fill_in  = val
+  case(amg_ainv_alg_)
+    sv%alg      = val
+  case default
+!!$      write(0,*) name,': Error: invalid WHAT'
+!!$      info = -2
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_ainv_solver_seti

amgprec/impl/solver/amg_d_ainv_solver_setr.f90

@@ -0,0 +1,69 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_ainv_solver_setr(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_d_ainv_solver, amg_protect_name => amg_d_ainv_solver_setr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_d_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  real(psb_dpk_), intent(in)                   :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act
+  character(len=20)  :: name='amg_d_ainv_solver_setr'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  select case(what)
+  case(amg_sub_iluthrs_)
+    sv%thresh = val
+  case default
+!!$      write(0,*) name,': Error: invalid WHAT'
+!!$      info = -2
+!!$      goto 9999
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_ainv_solver_setr

amgprec/impl/solver/amg_d_base_ainv_solver_apply.f90

@@ -0,0 +1,153 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_base_ainv_solver_apply(alpha,sv,x,beta,y,desc_data,&
+     & trans,work,info,init,initu)
+
+  use psb_base_mod
+  use amg_d_base_ainv_mod, amg_protect_name => amg_d_base_ainv_solver_apply
+  implicit none
+  type(psb_desc_type), intent(in)        :: desc_data
+  class(amg_d_base_ainv_solver_type), intent(inout) :: sv
+  real(psb_dpk_),intent(inout)           :: x(:)
+  real(psb_dpk_),intent(inout)           :: y(:)
+  real(psb_dpk_),intent(in)              :: alpha,beta
+  character(len=1),intent(in)            :: trans
+  real(psb_dpk_),target, intent(inout)   :: work(:)
+  integer(psb_ipk_), intent(out)         :: info
+  character, intent(in), optional        :: init
+  real(psb_dpk_),intent(inout), optional :: initu(:)
+  !
+  integer(psb_ipk_)  :: n_row,n_col
+  real(psb_dpk_), pointer :: ww(:), aux(:), tx(:),ty(:)
+  integer(psb_ipk_)  :: np,me,i, err_act
+  type(psb_ctxt_type)   :: ctxt
+  character          :: trans_
+  character(len=20)  :: name='d_base_ainv_solver_apply'
+
+  call psb_erractionsave(err_act)
+
+  info = psb_success_
+
+  trans_ = psb_toupper(trans)
+  select case(trans_)
+  case('N')
+  case('T','C')
+  case default
+    call psb_errpush(psb_err_iarg_invalid_i_,name)
+    goto 9999
+  end select
+  !
+  ! For non-iterative solvers, init and initu are ignored.
+  !
+
+  n_row = psb_cd_get_local_rows(desc_data)
+  n_col = psb_cd_get_local_cols(desc_data)
+
+  if (n_col <= size(work)) then
+    ww => work(1:n_col)
+    if ((4*n_col+n_col) <= size(work)) then
+      aux => work(n_col+1:)
+    else
+      allocate(aux(4*n_col),stat=info)
+      if (info /= psb_success_) then
+        info=psb_err_alloc_request_
+        call psb_errpush(info,name,i_err=(/4*n_col/),&
+             & a_err='real(psb_dpk_)')
+        goto 9999
+      end if
+    endif
+  else
+    allocate(ww(n_col),aux(4*n_col),stat=info)
+    if (info /= psb_success_) then
+      info=psb_err_alloc_request_
+      call psb_errpush(info,name,i_err=(/5*n_col/),&
+           & a_err='real(psb_dpk_)')
+      goto 9999
+    end if
+  endif
+
+  select case(trans_)
+  case('N')
+    call psb_spmm(done,sv%w,x,dzero,ww,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+    ww(1:n_row) = ww(1:n_row) * sv%d(1:n_row)
+    if (info == psb_success_) &
+         & call psb_spmm(alpha,sv%z,ww,beta,y,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+
+  case('T','C')
+    call psb_spmm(done,sv%z,x,dzero,ww,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+    ww(1:n_row) = ww(1:n_row) * sv%d(1:n_row)
+    if (info == psb_success_) &
+         & call psb_spmm(alpha,sv%w,ww,beta,y,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+
+  case default
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Invalid TRANS in ainv subsolve')
+    goto 9999
+  end select
+
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Error in subsolve')
+    goto 9999
+  endif
+
+  if (n_col <= size(work)) then
+    if ((4*n_col+n_col) <= size(work)) then
+    else
+      deallocate(aux,stat=info)
+    endif
+  else
+    deallocate(ww,aux,stat=info)
+  endif
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Deallocate')
+    goto 9999
+  endif
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_base_ainv_solver_apply

amgprec/impl/solver/amg_d_base_ainv_solver_apply_vect.f90

@@ -0,0 +1,167 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_base_ainv_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
+     & trans,work,wv,info,init,initu)
+
+  use psb_base_mod
+  use amg_d_base_ainv_mod, amg_protect_name => amg_d_base_ainv_solver_apply_vect
+  implicit none
+  type(psb_desc_type), intent(in)               :: desc_data
+  class(amg_d_base_ainv_solver_type), intent(inout) :: sv
+  type(psb_d_vect_type), intent(inout)          :: x
+  type(psb_d_vect_type), intent(inout)          :: y
+  real(psb_dpk_), intent(in)                    :: alpha,beta
+  character(len=1), intent(in)                  :: trans
+  real(psb_dpk_),target, intent(inout)          :: work(:)
+  type(psb_d_vect_type),intent(inout)           :: wv(:)
+  integer(psb_ipk_), intent(out)                :: info
+  character, intent(in), optional               :: init
+  type(psb_d_vect_type),intent(inout), optional :: initu
+  !
+  integer(psb_ipk_)     :: n_row,n_col
+  real(psb_dpk_), pointer :: ww(:), aux(:)
+  type(psb_d_vect_type) :: tx,ty
+  integer(psb_ipk_)     :: np,me,i, err_act
+  type(psb_ctxt_type)   :: ctxt
+  character             :: trans_
+  character(len=20)     :: name='d_base_ainv_solver_apply'
+
+  call psb_erractionsave(err_act)
+
+  info = psb_success_
+
+  trans_ = psb_toupper(trans)
+  select case(trans_)
+  case('N')
+  case('T','C')
+  case default
+    call psb_errpush(psb_err_iarg_invalid_i_,name)
+    goto 9999
+  end select
+  !
+  ! For non-iterative solvers, init and initu are ignored.
+  !
+
+  n_row = psb_cd_get_local_rows(desc_data)
+  n_col = psb_cd_get_local_cols(desc_data)
+
+  if (n_col <= size(work)) then
+    ww => work(1:n_col)
+    if ((4*n_col+n_col) <= size(work)) then
+      aux => work(n_col+1:)
+    else
+      allocate(aux(4*n_col),stat=info)
+      if (info /= psb_success_) then
+        info=psb_err_alloc_request_
+        call psb_errpush(info,name,i_err=(/4*n_col/),&
+             & a_err='real(psb_dpk_)')
+        goto 9999
+      end if
+    endif
+  else
+    allocate(ww(n_col),aux(4*n_col),stat=info)
+    if (info /= psb_success_) then
+      info=psb_err_alloc_request_
+      call psb_errpush(info,name,i_err=(/5*n_col/),&
+           & a_err='real(psb_dpk_)')
+      goto 9999
+    end if
+  endif
+
+  if (size(wv) < 2) then
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,&
+         & a_err='invalid wv size')
+    goto 9999
+  end if
+
+
+  associate(tx => wv(1), ty => wv(2))
+
+    select case(trans_)
+    case('N')
+      call psb_spmm(done,sv%w,x,dzero,tx,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+      if (info == psb_success_) call ty%mlt(done,sv%dv,tx,dzero,info)
+      if (info == psb_success_) &
+           & call psb_spmm(alpha,sv%z,ty,beta,y,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+
+    case('T','C')
+      call psb_spmm(done,sv%z,x,dzero,tx,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+      if (info == psb_success_) call ty%mlt(done,sv%dv,tx,dzero,info)
+      if (info == psb_success_) &
+           & call psb_spmm(alpha,sv%w,ty,beta,y,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+
+    case default
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Invalid TRANS in ainv subsolve')
+      goto 9999
+    end select
+
+
+    if (info /= psb_success_) then
+
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Error in subsolve')
+      goto 9999
+    endif
+
+  end associate
+
+  if (n_col <= size(work)) then
+    if ((4*n_col+n_col) <= size(work)) then
+    else
+      deallocate(aux,stat=info)
+    endif
+  else
+    deallocate(ww,aux,stat=info)
+  endif
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Deallocate')
+    goto 9999
+  endif
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_base_ainv_solver_apply_vect

amgprec/impl/solver/amg_d_base_ainv_solver_cnv.f90

@@ -0,0 +1,63 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_base_ainv_solver_cnv(sv,info,amold,vmold,imold)
+  use psb_base_mod
+  use amg_d_base_ainv_mod, amg_protect_name => amg_d_base_ainv_solver_cnv
+  Implicit None
+  ! Arguments
+  class(amg_d_base_ainv_solver_type), intent(inout)  :: sv
+  integer(psb_ipk_), intent(out)                     :: info
+  class(psb_d_base_sparse_mat), intent(in), optional :: amold
+  class(psb_d_base_vect_type), intent(in), optional  :: vmold
+  class(psb_i_base_vect_type), intent(in), optional  :: imold
+
+  !local
+  integer(psb_ipk_)  :: i, j, il1, iln, lname, lev
+  integer(psb_ipk_)  :: iam, np
+  type(psb_ctxt_type)   :: ctxt
+  character(len=80)  :: prefix_
+  character(len=120) :: fname ! len should be at least 20 more than
+  logical :: solver_
+  !  len of prefix_
+
+  info = 0
+
+  if (present(amold)) then
+    call sv%w%cscnv(info,mold=amold)
+    call sv%z%cscnv(info,mold=amold)
+  end if
+  call sv%dv%cnv(mold=vmold)
+
+end subroutine amg_d_base_ainv_solver_cnv

amgprec/impl/solver/amg_d_base_ainv_solver_dmp.f90

@@ -0,0 +1,93 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_base_ainv_solver_dmp(sv,desc,level,info,prefix,head,solver,global_num)
+
+  use psb_base_mod
+  use amg_d_base_ainv_mod, amg_protect_name => amg_d_base_ainv_solver_dmp
+  implicit none
+  class(amg_d_base_ainv_solver_type), intent(in) :: sv
+  type(psb_desc_type), intent(in)             :: desc
+  integer(psb_ipk_), intent(in)              :: level
+  integer(psb_ipk_), intent(out)             :: info
+  character(len=*), intent(in), optional     :: prefix, head
+  logical, optional, intent(in)              :: solver, global_num
+  !
+  integer(psb_ipk_)  :: i, j, il1, iln, lname, lev
+  integer(psb_ipk_)  :: iam, np
+  type(psb_ctxt_type)   :: ctxt
+  character(len=80)  :: prefix_
+  character(len=120) :: fname ! len should be at least 20 more than
+  logical :: solver_, global_num_
+  !  len of prefix_
+
+  info = 0
+
+  if (present(prefix)) then
+    prefix_ = trim(prefix(1:min(len(prefix),len(prefix_))))
+  else
+    prefix_ = "dump_ainv_d"
+  end if
+
+  ctxt = desc%get_context()
+  call psb_info(ctxt,iam,np)
+
+  if (present(solver)) then
+    solver_ = solver
+  else
+    solver_ = .false.
+  end if
+  if (present(global_num)) then
+    global_num_ = global_num
+  else
+    global_num_ = .false.
+  end if
+  lname = len_trim(prefix_)
+  fname = trim(prefix_)
+  write(fname(lname+1:lname+5),'(a,i3.3)') '_p',iam
+  lname = lname + 5
+
+  if (solver_) then
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_wmat.mtx'
+    if (sv%w%is_asb()) &
+         & call sv%w%print(fname,head=head)
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_diag.mtx'
+    if (allocated(sv%d)) &
+         & call psb_geprt(fname,sv%d,head=head)
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_zmat.mtx'
+    if (sv%z%is_asb()) &
+         & call sv%z%print(fname,head=head)
+  end if
+
+end subroutine amg_d_base_ainv_solver_dmp

amgprec/impl/solver/amg_d_base_ainv_solver_free.f90

@@ -0,0 +1,70 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_base_ainv_solver_free(sv,info)
+
+  use psb_base_mod
+  use amg_d_base_ainv_mod, amg_protect_name => amg_d_base_ainv_solver_free
+
+  Implicit None
+
+  ! Arguments
+  class(amg_d_base_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)                    :: info
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_d_base_ainv_solver_free'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+  call sv%clear_data(info)
+
+  if (allocated(sv%d)) then
+    deallocate(sv%d,stat=info)
+    if (info /= psb_success_) then
+      info = psb_err_alloc_dealloc_
+      call psb_errpush(info,name)
+      goto 9999
+    end if
+  end if
+  call sv%w%free()
+  call sv%z%free()
+  call sv%dv%free(info)
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_d_base_ainv_solver_free

amgprec/impl/solver/amg_d_base_ainv_update_a.f90

@@ -0,0 +1,81 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_d_base_ainv_update_a(sv,x,desc_data,info)
+  use amg_d_base_ainv_mod, amg_protect_name => amg_d_base_ainv_update_a
+  use psb_base_mod
+
+  implicit none
+
+  type(psb_desc_type), intent(in)            :: desc_data
+  class(amg_d_base_ainv_solver_type), intent(inout) :: sv
+  real(psb_dpk_),intent(in)                  :: x(:)
+  integer(psb_ipk_), intent(out)             :: info
+
+  ! Local variables
+  real(psb_dpk_), allocatable   :: dd(:), ee(:)
+  integer(psb_ipk_) :: nrows, ncols, i, j, k, nzr, nzc, ir, ic
+
+  type(psb_d_csc_sparse_mat) :: ac
+  type(psb_d_csr_sparse_mat) :: ar
+
+  dd = sv%dv%get_vect()
+  if (size(x)<size(dd)) then
+    write(0,*) 'Wrong size in update',size(x),size(dd)
+    info = -1
+    return
+  end if
+
+  ee = x(1:size(dd))
+  call sv%z%cp_to(ac)
+  call sv%w%cp_to(ar)
+  ! Compute diag(W ee Z)
+  ! First  ee Z
+  call ac%scal(ee,info,side='L')
+  ! Then  diag(W (ee Z))
+  do i=1,ar%get_nrows()
+    ir  = ar%irp(i);  nzr = ar%irp(i+1)-ar%irp(i)
+    ic  = ac%icp(i);  nzc = ac%icp(i+1)-ac%icp(i)
+    ee(i) = psb_spdot_srtd(&
+         & nzr,ar%ja(ir:ir+nzr-1),ar%val(ir:ir+nzr-1),&
+         & nzc,ac%ia(ic:ic+nzc-1),ac%val(ic:ic+nzc-1))
+  end do
+  ! Now invert diagonal
+  dd = done/dd
+  dd = dd + ee
+  dd = done/dd
+  sv%d = dd
+  call sv%dv%bld(dd,mold=sv%dv%v)
+
+end subroutine amg_d_base_ainv_update_a

amgprec/impl/solver/amg_s_ainv_solver_bld.f90

@@ -0,0 +1,99 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_ainv_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
+
+
+  use psb_base_mod
+  use psb_s_ainv_fact_mod
+  use amg_prec_mod
+  use amg_s_ainv_solver, amg_protect_name => amg_s_ainv_solver_bld
+
+  Implicit None
+
+  ! Arguments
+  type(psb_sspmat_type), intent(in), target    :: a
+  Type(psb_desc_type), Intent(inout)           :: desc_a
+  class(amg_s_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)                      :: info
+  type(psb_sspmat_type), intent(in), target, optional :: b
+  class(psb_s_base_sparse_mat), intent(in), optional  :: amold
+  class(psb_s_base_vect_type), intent(in), optional   :: vmold
+  class(psb_i_base_vect_type), intent(in), optional   :: imold
+  ! Local variables
+  integer(psb_ipk_)  :: n_row,n_col, nrow_a, nztota
+  real(psb_spk_), pointer :: ww(:), aux(:), tx(:),ty(:)
+  integer(psb_ipk_)  :: np,me,i, err_act, debug_unit, debug_level
+  type(psb_ctxt_type) :: ctxt
+  character(len=20)  :: name='amg_s_ainv_solver_bld', ch_err
+
+  info=psb_success_
+  call psb_erractionsave(err_act)
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+  ctxt       = desc_a%get_context()
+  call psb_info(ctxt, me, np)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),' start'
+
+  call psb_s_ainv_bld(a,sv%alg,sv%fill_in,sv%thresh,&
+       & sv%w,sv%d,sv%z,desc_a,info,b,iscale=amg_ilu_scale_maxval_)
+
+  if ((info == psb_success_) .and.present(amold)) then
+    call sv%w%set_asb()
+    call sv%w%trim()
+    call sv%z%set_asb()
+    call sv%z%trim()
+    call sv%w%cscnv(info,mold=amold)
+    if (info == psb_success_) &
+         & call sv%z%cscnv(info,mold=amold)
+  end if
+
+  if (info == psb_success_) &
+       & call sv%dv%bld(sv%d,mold=vmold)
+
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name)
+    goto 9999
+  end if
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),' end'
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_ainv_solver_bld

amgprec/impl/solver/amg_s_ainv_solver_check.f90

@@ -0,0 +1,65 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_ainv_solver_check(sv,info)
+
+
+  use psb_base_mod
+  use amg_s_ainv_solver, amg_protect_name => amg_s_ainv_solver_check
+
+  Implicit None
+
+  ! Arguments
+  class(amg_s_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_s_ainv_solver_check'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  call amg_check_def(sv%fill_in,&
+       & 'Nzmin',ione,is_positive_nz_min)
+  call amg_check_def(sv%thresh,&
+       & 'Eps',szero,is_legal_s_fact_thrs)
+
+  if (info /= psb_success_) goto 9999
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_ainv_solver_check

amgprec/impl/solver/amg_s_ainv_solver_clone.f90

@@ -0,0 +1,91 @@
+!
+!
+!                             AMG4PSBLAS version 1.0
+!    MultiLevel Domain Decomposition Parallel Preconditioners Package
+!               based on PSBLAS (Parallel Sparse BLAS version 3.0)
+!
+!    (C) Copyright 2008,2009,2010,2010,2012
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!                        Alfredo Buttari      CNRS-IRIT, Toulouse
+!                        Pasqua D'Ambra       ICAR-CNR, Naples
+!                        Daniela di Serafino  Second University of Naples
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_ainv_solver_clone(sv,svout,info)
+
+  use psb_base_mod
+  use amg_s_ainv_solver, amg_protect_name => amg_s_ainv_solver_clone
+
+  Implicit None
+
+  ! Arguments
+  class(amg_s_ainv_solver_type), intent(inout)              :: sv
+  class(amg_s_base_solver_type), allocatable, intent(inout) :: svout
+  integer(psb_ipk_), intent(out)                            :: info
+  ! Local variables
+  integer(psb_ipk_) :: err_act
+
+
+  info=psb_success_
+  call psb_erractionsave(err_act)
+
+  if (allocated(svout)) then
+    call svout%free(info)
+    if (info == psb_success_) deallocate(svout, stat=info)
+  end if
+  if (info == psb_success_) &
+       & allocate(amg_s_ainv_solver_type :: svout, stat=info)
+  if (info /= 0) then
+    info = psb_err_alloc_dealloc_
+    goto 9999
+  end if
+  select type(svo => svout)
+  type is (amg_s_ainv_solver_type)
+    svo%alg      = sv%alg
+    svo%fill_in  = sv%fill_in
+    svo%thresh   = sv%thresh
+    call psb_safe_ab_cpy(sv%d,svo%d,info)
+    if (info == psb_success_) &
+         & call sv%dv%clone(svo%dv,info)
+    if (info == psb_success_) &
+         & call sv%w%clone(svo%w,info)
+    if (info == psb_success_) &
+         & call sv%z%clone(svo%z,info)
+
+  class default
+    info = psb_err_internal_error_
+  end select
+
+  if (info /= 0) goto 9999
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_ainv_solver_clone

amgprec/impl/solver/amg_s_ainv_solver_csetc.f90

@@ -0,0 +1,79 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_ainv_solver_csetc(sv,what,val,info,idx)
+
+
+  use psb_base_mod
+  use amg_s_ainv_solver, amg_protect_name => amg_s_ainv_solver_csetc
+
+  Implicit None
+
+  ! Arguments
+  class(amg_s_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  character(len=*), intent(in)                 :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_ ) :: err_act, ival
+  character(len=20)  :: name='amg_s_ainv_solver_setc'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+!!$  select case(psb_toupper(trim(what)))
+!!$  case('AINV_ALG')
+!!$    sv%alg  = sv%stringval(val)
+!!$  case default
+!!$    call sv%mld_d_base_solver_type%set(what,val,info)
+!!$  end select
+  ival =  sv%stringval(val)
+
+  if (ival >=0) then
+    call sv%set(what,ival,info)
+  end if
+
+  if (info /= psb_success_) then
+    info = psb_err_from_subroutine_
+    call psb_errpush(info, name)
+    goto 9999
+  end if
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_ainv_solver_csetc

amgprec/impl/solver/amg_s_ainv_solver_cseti.f90

@@ -0,0 +1,69 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_ainv_solver_cseti(sv,what,val,info,idx)
+
+  use psb_base_mod
+  use amg_s_ainv_solver, amg_protect_name => amg_s_ainv_solver_cseti
+
+  Implicit None
+
+  ! Arguments
+  class(amg_s_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  integer(psb_ipk_), intent(in)                :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_s_ainv_solver_cseti'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  select case(psb_toupper(trim(what)))
+  case('SUB_FILLIN')
+    sv%fill_in  = val
+  case('AINV_ALG')
+    sv%alg      = val
+  case default
+    call sv%amg_s_base_solver_type%set(what,val,info)
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_ainv_solver_cseti

amgprec/impl/solver/amg_s_ainv_solver_csetr.f90

@@ -0,0 +1,67 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_ainv_solver_csetr(sv,what,val,info,idx)
+
+  use psb_base_mod
+  use amg_s_ainv_solver, amg_protect_name => amg_s_ainv_solver_csetr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_s_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  real(psb_spk_), intent(in)                   :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_s_ainv_solver_csetr'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  select case(psb_toupper(what))
+  case('SUB_ILUTHRS')
+    sv%thresh = val
+  case default
+    call sv%amg_s_base_solver_type%set(what,val,info)
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_ainv_solver_csetr

amgprec/impl/solver/amg_s_ainv_solver_descr.f90

@@ -0,0 +1,73 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_ainv_solver_descr(sv,info,iout,coarse)
+
+
+  use psb_base_mod
+  use amg_s_ainv_solver, amg_protect_name => amg_s_ainv_solver_descr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_s_ainv_solver_type), intent(in) :: sv
+  integer(psb_ipk_), intent(out)            :: info
+  integer(psb_ipk_), intent(in), optional   :: iout
+  logical, intent(in), optional             :: coarse
+
+  ! Local variables
+  integer(psb_ipk_)      :: err_act
+  integer(psb_ipk_)      :: ictxt, me, np
+  character(len=20), parameter :: name='amg_s_ainv_solver_descr'
+  integer(psb_ipk_)      :: iout_
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+  if (present(iout)) then
+    iout_ = iout
+  else
+    iout_ = 6
+  endif
+
+  write(iout_,*) '  AINV: Approximate Inverse with sparse biconjugation '
+  write(iout_,*) '  Algorithm variant      : ',sv%algname(sv%alg)
+  write(iout_,*) '  Fill level             : ',sv%fill_in
+  write(iout_,*) '  Fill threshold         : ',sv%thresh
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_ainv_solver_descr

amgprec/impl/solver/amg_s_ainv_solver_setc.f90

@@ -0,0 +1,71 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_ainv_solver_setc(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_s_ainv_solver, amg_protect_name => amg_s_ainv_solver_setc
+
+  Implicit None
+
+  ! Arguments
+  class(amg_s_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  character(len=*), intent(in)                 :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act, ival
+  character(len=20)  :: name='amg_s_ainv_solver_setc'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  ival =  sv%stringval(val)
+  if (ival >=0) then
+    call sv%set(what,ival,info)
+  end if
+
+  if (info /= psb_success_) then
+    info = psb_err_from_subroutine_
+    call psb_errpush(info, name)
+    goto 9999
+  end if
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_ainv_solver_setc

amgprec/impl/solver/amg_s_ainv_solver_seti.f90

@@ -0,0 +1,70 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_ainv_solver_seti(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_s_ainv_solver, amg_protect_name => amg_s_ainv_solver_seti
+
+  Implicit None
+
+  ! Arguments
+  class(amg_s_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  integer(psb_ipk_), intent(in)                :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act
+  character(len=20)  :: name='amg_s_ainv_solver_seti'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  select case(what)
+  case(amg_sub_fillin_)
+    sv%fill_in  = val
+  case(amg_ainv_alg_)
+    sv%alg      = val
+  case default
+!!$      write(0,*) name,': Error: invalid WHAT'
+!!$      info = -2
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_ainv_solver_seti

amgprec/impl/solver/amg_s_ainv_solver_setr.f90

@@ -0,0 +1,69 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_ainv_solver_setr(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_s_ainv_solver, amg_protect_name => amg_s_ainv_solver_setr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_s_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  real(psb_spk_), intent(in)                   :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act
+  character(len=20)  :: name='amg_s_ainv_solver_setr'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  select case(what)
+  case(amg_sub_iluthrs_)
+    sv%thresh = val
+  case default
+!!$      write(0,*) name,': Error: invalid WHAT'
+!!$      info = -2
+!!$      goto 9999
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_ainv_solver_setr

amgprec/impl/solver/amg_s_base_ainv_solver_apply.f90

@@ -0,0 +1,153 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_base_ainv_solver_apply(alpha,sv,x,beta,y,desc_data,&
+     & trans,work,info,init,initu)
+
+  use psb_base_mod
+  use amg_s_base_ainv_mod, amg_protect_name => amg_s_base_ainv_solver_apply
+  implicit none
+  type(psb_desc_type), intent(in)        :: desc_data
+  class(amg_s_base_ainv_solver_type), intent(inout) :: sv
+  real(psb_spk_),intent(inout)           :: x(:)
+  real(psb_spk_),intent(inout)           :: y(:)
+  real(psb_spk_),intent(in)              :: alpha,beta
+  character(len=1),intent(in)            :: trans
+  real(psb_spk_),target, intent(inout)   :: work(:)
+  integer(psb_ipk_), intent(out)         :: info
+  character, intent(in), optional        :: init
+  real(psb_spk_),intent(inout), optional :: initu(:)
+  !
+  integer(psb_ipk_)  :: n_row,n_col
+  real(psb_spk_), pointer :: ww(:), aux(:), tx(:),ty(:)
+  integer(psb_ipk_)  :: np,me,i, err_act
+  type(psb_ctxt_type)   :: ctxt
+  character          :: trans_
+  character(len=20)  :: name='d_base_ainv_solver_apply'
+
+  call psb_erractionsave(err_act)
+
+  info = psb_success_
+
+  trans_ = psb_toupper(trans)
+  select case(trans_)
+  case('N')
+  case('T','C')
+  case default
+    call psb_errpush(psb_err_iarg_invalid_i_,name)
+    goto 9999
+  end select
+  !
+  ! For non-iterative solvers, init and initu are ignored.
+  !
+
+  n_row = psb_cd_get_local_rows(desc_data)
+  n_col = psb_cd_get_local_cols(desc_data)
+
+  if (n_col <= size(work)) then
+    ww => work(1:n_col)
+    if ((4*n_col+n_col) <= size(work)) then
+      aux => work(n_col+1:)
+    else
+      allocate(aux(4*n_col),stat=info)
+      if (info /= psb_success_) then
+        info=psb_err_alloc_request_
+        call psb_errpush(info,name,i_err=(/4*n_col/),&
+             & a_err='real(psb_dpk_)')
+        goto 9999
+      end if
+    endif
+  else
+    allocate(ww(n_col),aux(4*n_col),stat=info)
+    if (info /= psb_success_) then
+      info=psb_err_alloc_request_
+      call psb_errpush(info,name,i_err=(/5*n_col/),&
+           & a_err='real(psb_dpk_)')
+      goto 9999
+    end if
+  endif
+
+  select case(trans_)
+  case('N')
+    call psb_spmm(sone,sv%w,x,szero,ww,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+    ww(1:n_row) = ww(1:n_row) * sv%d(1:n_row)
+    if (info == psb_success_) &
+         & call psb_spmm(alpha,sv%z,ww,beta,y,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+
+  case('T','C')
+    call psb_spmm(sone,sv%z,x,szero,ww,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+    ww(1:n_row) = ww(1:n_row) * sv%d(1:n_row)
+    if (info == psb_success_) &
+         & call psb_spmm(alpha,sv%w,ww,beta,y,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+
+  case default
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Invalid TRANS in ainv subsolve')
+    goto 9999
+  end select
+
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Error in subsolve')
+    goto 9999
+  endif
+
+  if (n_col <= size(work)) then
+    if ((4*n_col+n_col) <= size(work)) then
+    else
+      deallocate(aux,stat=info)
+    endif
+  else
+    deallocate(ww,aux,stat=info)
+  endif
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Deallocate')
+    goto 9999
+  endif
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_base_ainv_solver_apply

amgprec/impl/solver/amg_s_base_ainv_solver_apply_vect.f90

@@ -0,0 +1,167 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_base_ainv_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
+     & trans,work,wv,info,init,initu)
+
+  use psb_base_mod
+  use amg_s_base_ainv_mod, amg_protect_name => amg_s_base_ainv_solver_apply_vect
+  implicit none
+  type(psb_desc_type), intent(in)               :: desc_data
+  class(amg_s_base_ainv_solver_type), intent(inout) :: sv
+  type(psb_s_vect_type), intent(inout)          :: x
+  type(psb_s_vect_type), intent(inout)          :: y
+  real(psb_spk_), intent(in)                    :: alpha,beta
+  character(len=1), intent(in)                  :: trans
+  real(psb_spk_),target, intent(inout)          :: work(:)
+  type(psb_s_vect_type),intent(inout)           :: wv(:)
+  integer(psb_ipk_), intent(out)                :: info
+  character, intent(in), optional               :: init
+  type(psb_s_vect_type),intent(inout), optional :: initu
+  !
+  integer(psb_ipk_)     :: n_row,n_col
+  real(psb_spk_), pointer :: ww(:), aux(:)
+  type(psb_s_vect_type) :: tx,ty
+  integer(psb_ipk_)     :: np,me,i, err_act
+  type(psb_ctxt_type)   :: ctxt
+  character             :: trans_
+  character(len=20)     :: name='d_base_ainv_solver_apply'
+
+  call psb_erractionsave(err_act)
+
+  info = psb_success_
+
+  trans_ = psb_toupper(trans)
+  select case(trans_)
+  case('N')
+  case('T','C')
+  case default
+    call psb_errpush(psb_err_iarg_invalid_i_,name)
+    goto 9999
+  end select
+  !
+  ! For non-iterative solvers, init and initu are ignored.
+  !
+
+  n_row = psb_cd_get_local_rows(desc_data)
+  n_col = psb_cd_get_local_cols(desc_data)
+
+  if (n_col <= size(work)) then
+    ww => work(1:n_col)
+    if ((4*n_col+n_col) <= size(work)) then
+      aux => work(n_col+1:)
+    else
+      allocate(aux(4*n_col),stat=info)
+      if (info /= psb_success_) then
+        info=psb_err_alloc_request_
+        call psb_errpush(info,name,i_err=(/4*n_col/),&
+             & a_err='real(psb_dpk_)')
+        goto 9999
+      end if
+    endif
+  else
+    allocate(ww(n_col),aux(4*n_col),stat=info)
+    if (info /= psb_success_) then
+      info=psb_err_alloc_request_
+      call psb_errpush(info,name,i_err=(/5*n_col/),&
+           & a_err='real(psb_dpk_)')
+      goto 9999
+    end if
+  endif
+
+  if (size(wv) < 2) then
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,&
+         & a_err='invalid wv size')
+    goto 9999
+  end if
+
+
+  associate(tx => wv(1), ty => wv(2))
+
+    select case(trans_)
+    case('N')
+      call psb_spmm(sone,sv%w,x,szero,tx,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+      if (info == psb_success_) call ty%mlt(sone,sv%dv,tx,szero,info)
+      if (info == psb_success_) &
+           & call psb_spmm(alpha,sv%z,ty,beta,y,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+
+    case('T','C')
+      call psb_spmm(sone,sv%z,x,szero,tx,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+      if (info == psb_success_) call ty%mlt(sone,sv%dv,tx,szero,info)
+      if (info == psb_success_) &
+           & call psb_spmm(alpha,sv%w,ty,beta,y,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+
+    case default
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Invalid TRANS in ainv subsolve')
+      goto 9999
+    end select
+
+
+    if (info /= psb_success_) then
+
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Error in subsolve')
+      goto 9999
+    endif
+
+  end associate
+
+  if (n_col <= size(work)) then
+    if ((4*n_col+n_col) <= size(work)) then
+    else
+      deallocate(aux,stat=info)
+    endif
+  else
+    deallocate(ww,aux,stat=info)
+  endif
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Deallocate')
+    goto 9999
+  endif
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_base_ainv_solver_apply_vect

amgprec/impl/solver/amg_s_base_ainv_solver_cnv.f90

@@ -0,0 +1,63 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_base_ainv_solver_cnv(sv,info,amold,vmold,imold)
+  use psb_base_mod
+  use amg_s_base_ainv_mod, amg_protect_name => amg_s_base_ainv_solver_cnv
+  Implicit None
+  ! Arguments
+  class(amg_s_base_ainv_solver_type), intent(inout)  :: sv
+  integer(psb_ipk_), intent(out)                     :: info
+  class(psb_s_base_sparse_mat), intent(in), optional :: amold
+  class(psb_s_base_vect_type), intent(in), optional  :: vmold
+  class(psb_i_base_vect_type), intent(in), optional  :: imold
+
+  !local
+  integer(psb_ipk_)  :: i, j, il1, iln, lname, lev
+  integer(psb_ipk_)  :: iam, np
+  type(psb_ctxt_type)   :: ctxt
+  character(len=80)  :: prefix_
+  character(len=120) :: fname ! len should be at least 20 more than
+  logical :: solver_
+  !  len of prefix_
+
+  info = 0
+
+  if (present(amold)) then
+    call sv%w%cscnv(info,mold=amold)
+    call sv%z%cscnv(info,mold=amold)
+  end if
+  call sv%dv%cnv(mold=vmold)
+
+end subroutine amg_s_base_ainv_solver_cnv

amgprec/impl/solver/amg_s_base_ainv_solver_dmp.f90

@@ -0,0 +1,93 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_base_ainv_solver_dmp(sv,desc,level,info,prefix,head,solver,global_num)
+
+  use psb_base_mod
+  use amg_s_base_ainv_mod, amg_protect_name => amg_s_base_ainv_solver_dmp
+  implicit none
+  class(amg_s_base_ainv_solver_type), intent(in) :: sv
+  type(psb_desc_type), intent(in)             :: desc
+  integer(psb_ipk_), intent(in)              :: level
+  integer(psb_ipk_), intent(out)             :: info
+  character(len=*), intent(in), optional     :: prefix, head
+  logical, optional, intent(in)              :: solver, global_num
+  !
+  integer(psb_ipk_)  :: i, j, il1, iln, lname, lev
+  integer(psb_ipk_)  :: iam, np
+  type(psb_ctxt_type)   :: ctxt
+  character(len=80)  :: prefix_
+  character(len=120) :: fname ! len should be at least 20 more than
+  logical :: solver_, global_num_
+  !  len of prefix_
+
+  info = 0
+
+  if (present(prefix)) then
+    prefix_ = trim(prefix(1:min(len(prefix),len(prefix_))))
+  else
+    prefix_ = "dump_ainv_d"
+  end if
+
+  ctxt = desc%get_context()
+  call psb_info(ctxt,iam,np)
+
+  if (present(solver)) then
+    solver_ = solver
+  else
+    solver_ = .false.
+  end if
+  if (present(global_num)) then
+    global_num_ = global_num
+  else
+    global_num_ = .false.
+  end if
+  lname = len_trim(prefix_)
+  fname = trim(prefix_)
+  write(fname(lname+1:lname+5),'(a,i3.3)') '_p',iam
+  lname = lname + 5
+
+  if (solver_) then
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_wmat.mtx'
+    if (sv%w%is_asb()) &
+         & call sv%w%print(fname,head=head)
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_diag.mtx'
+    if (allocated(sv%d)) &
+         & call psb_geprt(fname,sv%d,head=head)
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_zmat.mtx'
+    if (sv%z%is_asb()) &
+         & call sv%z%print(fname,head=head)
+  end if
+
+end subroutine amg_s_base_ainv_solver_dmp

amgprec/impl/solver/amg_s_base_ainv_solver_free.f90

@@ -0,0 +1,70 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_base_ainv_solver_free(sv,info)
+
+  use psb_base_mod
+  use amg_s_base_ainv_mod, amg_protect_name => amg_s_base_ainv_solver_free
+
+  Implicit None
+
+  ! Arguments
+  class(amg_s_base_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)                    :: info
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_s_base_ainv_solver_free'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+  call sv%clear_data(info)
+
+  if (allocated(sv%d)) then
+    deallocate(sv%d,stat=info)
+    if (info /= psb_success_) then
+      info = psb_err_alloc_dealloc_
+      call psb_errpush(info,name)
+      goto 9999
+    end if
+  end if
+  call sv%w%free()
+  call sv%z%free()
+  call sv%dv%free(info)
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_s_base_ainv_solver_free

amgprec/impl/solver/amg_s_base_ainv_update_a.f90

@@ -0,0 +1,81 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_s_base_ainv_update_a(sv,x,desc_data,info)
+  use amg_s_base_ainv_mod, amg_protect_name => amg_s_base_ainv_update_a
+  use psb_base_mod
+
+  implicit none
+
+  type(psb_desc_type), intent(in)            :: desc_data
+  class(amg_s_base_ainv_solver_type), intent(inout) :: sv
+  real(psb_spk_),intent(in)                  :: x(:)
+  integer(psb_ipk_), intent(out)             :: info
+
+  ! Local variables
+  real(psb_spk_), allocatable   :: dd(:), ee(:)
+  integer(psb_ipk_) :: nrows, ncols, i, j, k, nzr, nzc, ir, ic
+
+  type(psb_s_csc_sparse_mat) :: ac
+  type(psb_s_csr_sparse_mat) :: ar
+
+  dd = sv%dv%get_vect()
+  if (size(x)<size(dd)) then
+    write(0,*) 'Wrong size in update',size(x),size(dd)
+    info = -1
+    return
+  end if
+
+  ee = x(1:size(dd))
+  call sv%z%cp_to(ac)
+  call sv%w%cp_to(ar)
+  ! Compute diag(W ee Z)
+  ! First  ee Z
+  call ac%scal(ee,info,side='L')
+  ! Then  diag(W (ee Z))
+  do i=1,ar%get_nrows()
+    ir  = ar%irp(i);  nzr = ar%irp(i+1)-ar%irp(i)
+    ic  = ac%icp(i);  nzc = ac%icp(i+1)-ac%icp(i)
+    ee(i) = psb_spdot_srtd(&
+         & nzr,ar%ja(ir:ir+nzr-1),ar%val(ir:ir+nzr-1),&
+         & nzc,ac%ia(ic:ic+nzc-1),ac%val(ic:ic+nzc-1))
+  end do
+  ! Now invert diagonal
+  dd = done/dd
+  dd = dd + ee
+  dd = done/dd
+  sv%d = dd
+  call sv%dv%bld(dd,mold=sv%dv%v)
+
+end subroutine amg_s_base_ainv_update_a

amgprec/impl/solver/amg_z_ainv_solver_bld.f90

@@ -0,0 +1,99 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_ainv_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
+
+
+  use psb_base_mod
+  use psb_z_ainv_fact_mod
+  use amg_prec_mod
+  use amg_z_ainv_solver, amg_protect_name => amg_z_ainv_solver_bld
+
+  Implicit None
+
+  ! Arguments
+  type(psb_zspmat_type), intent(in), target    :: a
+  Type(psb_desc_type), Intent(inout)           :: desc_a
+  class(amg_z_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)                      :: info
+  type(psb_zspmat_type), intent(in), target, optional :: b
+  class(psb_z_base_sparse_mat), intent(in), optional  :: amold
+  class(psb_z_base_vect_type), intent(in), optional   :: vmold
+  class(psb_i_base_vect_type), intent(in), optional   :: imold
+  ! Local variables
+  integer(psb_ipk_)  :: n_row,n_col, nrow_a, nztota
+  complex(psb_dpk_), pointer :: ww(:), aux(:), tx(:),ty(:)
+  integer(psb_ipk_)  :: np,me,i, err_act, debug_unit, debug_level
+  type(psb_ctxt_type) :: ctxt
+  character(len=20)  :: name='amg_z_ainv_solver_bld', ch_err
+
+  info=psb_success_
+  call psb_erractionsave(err_act)
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+  ctxt       = desc_a%get_context()
+  call psb_info(ctxt, me, np)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),' start'
+
+  call psb_z_ainv_bld(a,sv%alg,sv%fill_in,sv%thresh,&
+       & sv%w,sv%d,sv%z,desc_a,info,b,iscale=amg_ilu_scale_maxval_)
+
+  if ((info == psb_success_) .and.present(amold)) then
+    call sv%w%set_asb()
+    call sv%w%trim()
+    call sv%z%set_asb()
+    call sv%z%trim()
+    call sv%w%cscnv(info,mold=amold)
+    if (info == psb_success_) &
+         & call sv%z%cscnv(info,mold=amold)
+  end if
+
+  if (info == psb_success_) &
+       & call sv%dv%bld(sv%d,mold=vmold)
+
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name)
+    goto 9999
+  end if
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),' end'
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_ainv_solver_bld

amgprec/impl/solver/amg_z_ainv_solver_check.f90

@@ -0,0 +1,65 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_ainv_solver_check(sv,info)
+
+
+  use psb_base_mod
+  use amg_z_ainv_solver, amg_protect_name => amg_z_ainv_solver_check
+
+  Implicit None
+
+  ! Arguments
+  class(amg_z_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_z_ainv_solver_check'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  call amg_check_def(sv%fill_in,&
+       & 'Nzmin',ione,is_positive_nz_min)
+  call amg_check_def(sv%thresh,&
+       & 'Eps',dzero,is_legal_d_fact_thrs)
+
+  if (info /= psb_success_) goto 9999
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_ainv_solver_check

amgprec/impl/solver/amg_z_ainv_solver_clone.f90

@@ -0,0 +1,91 @@
+!
+!
+!                             AMG4PSBLAS version 1.0
+!    MultiLevel Domain Decomposition Parallel Preconditioners Package
+!               based on PSBLAS (Parallel Sparse BLAS version 3.0)
+!
+!    (C) Copyright 2008,2009,2010,2010,2012
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!                        Alfredo Buttari      CNRS-IRIT, Toulouse
+!                        Pasqua D'Ambra       ICAR-CNR, Naples
+!                        Daniela di Serafino  Second University of Naples
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_ainv_solver_clone(sv,svout,info)
+
+  use psb_base_mod
+  use amg_z_ainv_solver, amg_protect_name => amg_z_ainv_solver_clone
+
+  Implicit None
+
+  ! Arguments
+  class(amg_z_ainv_solver_type), intent(inout)              :: sv
+  class(amg_z_base_solver_type), allocatable, intent(inout) :: svout
+  integer(psb_ipk_), intent(out)                            :: info
+  ! Local variables
+  integer(psb_ipk_) :: err_act
+
+
+  info=psb_success_
+  call psb_erractionsave(err_act)
+
+  if (allocated(svout)) then
+    call svout%free(info)
+    if (info == psb_success_) deallocate(svout, stat=info)
+  end if
+  if (info == psb_success_) &
+       & allocate(amg_z_ainv_solver_type :: svout, stat=info)
+  if (info /= 0) then
+    info = psb_err_alloc_dealloc_
+    goto 9999
+  end if
+  select type(svo => svout)
+  type is (amg_z_ainv_solver_type)
+    svo%alg      = sv%alg
+    svo%fill_in  = sv%fill_in
+    svo%thresh   = sv%thresh
+    call psb_safe_ab_cpy(sv%d,svo%d,info)
+    if (info == psb_success_) &
+         & call sv%dv%clone(svo%dv,info)
+    if (info == psb_success_) &
+         & call sv%w%clone(svo%w,info)
+    if (info == psb_success_) &
+         & call sv%z%clone(svo%z,info)
+
+  class default
+    info = psb_err_internal_error_
+  end select
+
+  if (info /= 0) goto 9999
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_ainv_solver_clone

amgprec/impl/solver/amg_z_ainv_solver_csetc.f90

@@ -0,0 +1,79 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_ainv_solver_csetc(sv,what,val,info,idx)
+
+
+  use psb_base_mod
+  use amg_z_ainv_solver, amg_protect_name => amg_z_ainv_solver_csetc
+
+  Implicit None
+
+  ! Arguments
+  class(amg_z_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  character(len=*), intent(in)                 :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_ ) :: err_act, ival
+  character(len=20)  :: name='amg_z_ainv_solver_setc'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+!!$  select case(psb_toupper(trim(what)))
+!!$  case('AINV_ALG')
+!!$    sv%alg  = sv%stringval(val)
+!!$  case default
+!!$    call sv%mld_d_base_solver_type%set(what,val,info)
+!!$  end select
+  ival =  sv%stringval(val)
+
+  if (ival >=0) then
+    call sv%set(what,ival,info)
+  end if
+
+  if (info /= psb_success_) then
+    info = psb_err_from_subroutine_
+    call psb_errpush(info, name)
+    goto 9999
+  end if
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_ainv_solver_csetc

amgprec/impl/solver/amg_z_ainv_solver_cseti.f90

@@ -0,0 +1,69 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_ainv_solver_cseti(sv,what,val,info,idx)
+
+  use psb_base_mod
+  use amg_z_ainv_solver, amg_protect_name => amg_z_ainv_solver_cseti
+
+  Implicit None
+
+  ! Arguments
+  class(amg_z_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  integer(psb_ipk_), intent(in)                :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_z_ainv_solver_cseti'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  select case(psb_toupper(trim(what)))
+  case('SUB_FILLIN')
+    sv%fill_in  = val
+  case('AINV_ALG')
+    sv%alg      = val
+  case default
+    call sv%amg_z_base_solver_type%set(what,val,info)
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_ainv_solver_cseti

amgprec/impl/solver/amg_z_ainv_solver_csetr.f90

@@ -0,0 +1,67 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_ainv_solver_csetr(sv,what,val,info,idx)
+
+  use psb_base_mod
+  use amg_z_ainv_solver, amg_protect_name => amg_z_ainv_solver_csetr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_z_ainv_solver_type), intent(inout) :: sv
+  character(len=*), intent(in)                 :: what
+  real(psb_dpk_), intent(in)                   :: val
+  integer(psb_ipk_), intent(out)               :: info
+  integer(psb_ipk_), intent(in), optional      :: idx
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_z_ainv_solver_csetr'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  select case(psb_toupper(what))
+  case('SUB_ILUTHRS')
+    sv%thresh = val
+  case default
+    call sv%amg_z_base_solver_type%set(what,val,info)
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_ainv_solver_csetr

amgprec/impl/solver/amg_z_ainv_solver_descr.f90

@@ -0,0 +1,73 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_ainv_solver_descr(sv,info,iout,coarse)
+
+
+  use psb_base_mod
+  use amg_z_ainv_solver, amg_protect_name => amg_z_ainv_solver_descr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_z_ainv_solver_type), intent(in) :: sv
+  integer(psb_ipk_), intent(out)            :: info
+  integer(psb_ipk_), intent(in), optional   :: iout
+  logical, intent(in), optional             :: coarse
+
+  ! Local variables
+  integer(psb_ipk_)      :: err_act
+  integer(psb_ipk_)      :: ictxt, me, np
+  character(len=20), parameter :: name='amg_z_ainv_solver_descr'
+  integer(psb_ipk_)      :: iout_
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+  if (present(iout)) then
+    iout_ = iout
+  else
+    iout_ = 6
+  endif
+
+  write(iout_,*) '  AINV: Approximate Inverse with sparse biconjugation '
+  write(iout_,*) '  Algorithm variant      : ',sv%algname(sv%alg)
+  write(iout_,*) '  Fill level             : ',sv%fill_in
+  write(iout_,*) '  Fill threshold         : ',sv%thresh
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_ainv_solver_descr

amgprec/impl/solver/amg_z_ainv_solver_setc.f90

@@ -0,0 +1,71 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_ainv_solver_setc(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_z_ainv_solver, amg_protect_name => amg_z_ainv_solver_setc
+
+  Implicit None
+
+  ! Arguments
+  class(amg_z_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  character(len=*), intent(in)                 :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act, ival
+  character(len=20)  :: name='amg_z_ainv_solver_setc'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  ival =  sv%stringval(val)
+  if (ival >=0) then
+    call sv%set(what,ival,info)
+  end if
+
+  if (info /= psb_success_) then
+    info = psb_err_from_subroutine_
+    call psb_errpush(info, name)
+    goto 9999
+  end if
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_ainv_solver_setc

amgprec/impl/solver/amg_z_ainv_solver_seti.f90

@@ -0,0 +1,70 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_ainv_solver_seti(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_z_ainv_solver, amg_protect_name => amg_z_ainv_solver_seti
+
+  Implicit None
+
+  ! Arguments
+  class(amg_z_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  integer(psb_ipk_), intent(in)                :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act
+  character(len=20)  :: name='amg_z_ainv_solver_seti'
+
+  info = psb_success_
+  call psb_erractionsave(err_act)
+
+  select case(what)
+  case(amg_sub_fillin_)
+    sv%fill_in  = val
+  case(amg_ainv_alg_)
+    sv%alg      = val
+  case default
+!!$      write(0,*) name,': Error: invalid WHAT'
+!!$      info = -2
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_ainv_solver_seti

amgprec/impl/solver/amg_z_ainv_solver_setr.f90

@@ -0,0 +1,69 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_ainv_solver_setr(sv,what,val,info)
+
+
+  use psb_base_mod
+  use amg_z_ainv_solver, amg_protect_name => amg_z_ainv_solver_setr
+
+  Implicit None
+
+  ! Arguments
+  class(amg_z_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(in)                :: what
+  real(psb_dpk_), intent(in)                   :: val
+  integer(psb_ipk_), intent(out)               :: info
+  !
+  integer(psb_ipk_)  :: err_act
+  character(len=20)  :: name='amg_z_ainv_solver_setr'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+
+  select case(what)
+  case(amg_sub_iluthrs_)
+    sv%thresh = val
+  case default
+!!$      write(0,*) name,': Error: invalid WHAT'
+!!$      info = -2
+!!$      goto 9999
+  end select
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_ainv_solver_setr

amgprec/impl/solver/amg_z_base_ainv_solver_apply.f90

@@ -0,0 +1,153 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_base_ainv_solver_apply(alpha,sv,x,beta,y,desc_data,&
+     & trans,work,info,init,initu)
+
+  use psb_base_mod
+  use amg_z_base_ainv_mod, amg_protect_name => amg_z_base_ainv_solver_apply
+  implicit none
+  type(psb_desc_type), intent(in)        :: desc_data
+  class(amg_z_base_ainv_solver_type), intent(inout) :: sv
+  complex(psb_dpk_),intent(inout)           :: x(:)
+  complex(psb_dpk_),intent(inout)           :: y(:)
+  complex(psb_dpk_),intent(in)              :: alpha,beta
+  character(len=1),intent(in)            :: trans
+  complex(psb_dpk_),target, intent(inout)   :: work(:)
+  integer(psb_ipk_), intent(out)         :: info
+  character, intent(in), optional        :: init
+  complex(psb_dpk_),intent(inout), optional :: initu(:)
+  !
+  integer(psb_ipk_)  :: n_row,n_col
+  complex(psb_dpk_), pointer :: ww(:), aux(:), tx(:),ty(:)
+  integer(psb_ipk_)  :: np,me,i, err_act
+  type(psb_ctxt_type)   :: ctxt
+  character          :: trans_
+  character(len=20)  :: name='d_base_ainv_solver_apply'
+
+  call psb_erractionsave(err_act)
+
+  info = psb_success_
+
+  trans_ = psb_toupper(trans)
+  select case(trans_)
+  case('N')
+  case('T','C')
+  case default
+    call psb_errpush(psb_err_iarg_invalid_i_,name)
+    goto 9999
+  end select
+  !
+  ! For non-iterative solvers, init and initu are ignored.
+  !
+
+  n_row = psb_cd_get_local_rows(desc_data)
+  n_col = psb_cd_get_local_cols(desc_data)
+
+  if (n_col <= size(work)) then
+    ww => work(1:n_col)
+    if ((4*n_col+n_col) <= size(work)) then
+      aux => work(n_col+1:)
+    else
+      allocate(aux(4*n_col),stat=info)
+      if (info /= psb_success_) then
+        info=psb_err_alloc_request_
+        call psb_errpush(info,name,i_err=(/4*n_col/),&
+             & a_err='real(psb_dpk_)')
+        goto 9999
+      end if
+    endif
+  else
+    allocate(ww(n_col),aux(4*n_col),stat=info)
+    if (info /= psb_success_) then
+      info=psb_err_alloc_request_
+      call psb_errpush(info,name,i_err=(/5*n_col/),&
+           & a_err='real(psb_dpk_)')
+      goto 9999
+    end if
+  endif
+
+  select case(trans_)
+  case('N')
+    call psb_spmm(zone,sv%w,x,zzero,ww,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+    ww(1:n_row) = ww(1:n_row) * sv%d(1:n_row)
+    if (info == psb_success_) &
+         & call psb_spmm(alpha,sv%z,ww,beta,y,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+
+  case('T','C')
+    call psb_spmm(zone,sv%z,x,zzero,ww,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+    ww(1:n_row) = ww(1:n_row) * sv%d(1:n_row)
+    if (info == psb_success_) &
+         & call psb_spmm(alpha,sv%w,ww,beta,y,desc_data,info,&
+         & trans=trans_,work=aux,doswap=.false.)
+
+  case default
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Invalid TRANS in ainv subsolve')
+    goto 9999
+  end select
+
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Error in subsolve')
+    goto 9999
+  endif
+
+  if (n_col <= size(work)) then
+    if ((4*n_col+n_col) <= size(work)) then
+    else
+      deallocate(aux,stat=info)
+    endif
+  else
+    deallocate(ww,aux,stat=info)
+  endif
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Deallocate')
+    goto 9999
+  endif
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_base_ainv_solver_apply

amgprec/impl/solver/amg_z_base_ainv_solver_apply_vect.f90

@@ -0,0 +1,167 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_base_ainv_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
+     & trans,work,wv,info,init,initu)
+
+  use psb_base_mod
+  use amg_z_base_ainv_mod, amg_protect_name => amg_z_base_ainv_solver_apply_vect
+  implicit none
+  type(psb_desc_type), intent(in)               :: desc_data
+  class(amg_z_base_ainv_solver_type), intent(inout) :: sv
+  type(psb_z_vect_type), intent(inout)          :: x
+  type(psb_z_vect_type), intent(inout)          :: y
+  complex(psb_dpk_), intent(in)                    :: alpha,beta
+  character(len=1), intent(in)                  :: trans
+  complex(psb_dpk_),target, intent(inout)          :: work(:)
+  type(psb_z_vect_type),intent(inout)           :: wv(:)
+  integer(psb_ipk_), intent(out)                :: info
+  character, intent(in), optional               :: init
+  type(psb_z_vect_type),intent(inout), optional :: initu
+  !
+  integer(psb_ipk_)     :: n_row,n_col
+  complex(psb_dpk_), pointer :: ww(:), aux(:)
+  type(psb_z_vect_type) :: tx,ty
+  integer(psb_ipk_)     :: np,me,i, err_act
+  type(psb_ctxt_type)   :: ctxt
+  character             :: trans_
+  character(len=20)     :: name='d_base_ainv_solver_apply'
+
+  call psb_erractionsave(err_act)
+
+  info = psb_success_
+
+  trans_ = psb_toupper(trans)
+  select case(trans_)
+  case('N')
+  case('T','C')
+  case default
+    call psb_errpush(psb_err_iarg_invalid_i_,name)
+    goto 9999
+  end select
+  !
+  ! For non-iterative solvers, init and initu are ignored.
+  !
+
+  n_row = psb_cd_get_local_rows(desc_data)
+  n_col = psb_cd_get_local_cols(desc_data)
+
+  if (n_col <= size(work)) then
+    ww => work(1:n_col)
+    if ((4*n_col+n_col) <= size(work)) then
+      aux => work(n_col+1:)
+    else
+      allocate(aux(4*n_col),stat=info)
+      if (info /= psb_success_) then
+        info=psb_err_alloc_request_
+        call psb_errpush(info,name,i_err=(/4*n_col/),&
+             & a_err='real(psb_dpk_)')
+        goto 9999
+      end if
+    endif
+  else
+    allocate(ww(n_col),aux(4*n_col),stat=info)
+    if (info /= psb_success_) then
+      info=psb_err_alloc_request_
+      call psb_errpush(info,name,i_err=(/5*n_col/),&
+           & a_err='real(psb_dpk_)')
+      goto 9999
+    end if
+  endif
+
+  if (size(wv) < 2) then
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,&
+         & a_err='invalid wv size')
+    goto 9999
+  end if
+
+
+  associate(tx => wv(1), ty => wv(2))
+
+    select case(trans_)
+    case('N')
+      call psb_spmm(zone,sv%w,x,zzero,tx,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+      if (info == psb_success_) call ty%mlt(zone,sv%dv,tx,zzero,info)
+      if (info == psb_success_) &
+           & call psb_spmm(alpha,sv%z,ty,beta,y,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+
+    case('T','C')
+      call psb_spmm(zone,sv%z,x,zzero,tx,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+      if (info == psb_success_) call ty%mlt(zone,sv%dv,tx,zzero,info)
+      if (info == psb_success_) &
+           & call psb_spmm(alpha,sv%w,ty,beta,y,desc_data,info,&
+           & trans=trans_,work=aux,doswap=.false.)
+
+    case default
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Invalid TRANS in ainv subsolve')
+      goto 9999
+    end select
+
+
+    if (info /= psb_success_) then
+
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Error in subsolve')
+      goto 9999
+    endif
+
+  end associate
+
+  if (n_col <= size(work)) then
+    if ((4*n_col+n_col) <= size(work)) then
+    else
+      deallocate(aux,stat=info)
+    endif
+  else
+    deallocate(ww,aux,stat=info)
+  endif
+
+  if (info /= psb_success_) then
+
+    call psb_errpush(psb_err_internal_error_,name,&
+         & a_err='Deallocate')
+    goto 9999
+  endif
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_base_ainv_solver_apply_vect

amgprec/impl/solver/amg_z_base_ainv_solver_cnv.f90

@@ -0,0 +1,63 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_base_ainv_solver_cnv(sv,info,amold,vmold,imold)
+  use psb_base_mod
+  use amg_z_base_ainv_mod, amg_protect_name => amg_z_base_ainv_solver_cnv
+  Implicit None
+  ! Arguments
+  class(amg_z_base_ainv_solver_type), intent(inout)  :: sv
+  integer(psb_ipk_), intent(out)                     :: info
+  class(psb_z_base_sparse_mat), intent(in), optional :: amold
+  class(psb_z_base_vect_type), intent(in), optional  :: vmold
+  class(psb_i_base_vect_type), intent(in), optional  :: imold
+
+  !local
+  integer(psb_ipk_)  :: i, j, il1, iln, lname, lev
+  integer(psb_ipk_)  :: iam, np
+  type(psb_ctxt_type)   :: ctxt
+  character(len=80)  :: prefix_
+  character(len=120) :: fname ! len should be at least 20 more than
+  logical :: solver_
+  !  len of prefix_
+
+  info = 0
+
+  if (present(amold)) then
+    call sv%w%cscnv(info,mold=amold)
+    call sv%z%cscnv(info,mold=amold)
+  end if
+  call sv%dv%cnv(mold=vmold)
+
+end subroutine amg_z_base_ainv_solver_cnv

amgprec/impl/solver/amg_z_base_ainv_solver_dmp.f90

@@ -0,0 +1,93 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_base_ainv_solver_dmp(sv,desc,level,info,prefix,head,solver,global_num)
+
+  use psb_base_mod
+  use amg_z_base_ainv_mod, amg_protect_name => amg_z_base_ainv_solver_dmp
+  implicit none
+  class(amg_z_base_ainv_solver_type), intent(in) :: sv
+  type(psb_desc_type), intent(in)             :: desc
+  integer(psb_ipk_), intent(in)              :: level
+  integer(psb_ipk_), intent(out)             :: info
+  character(len=*), intent(in), optional     :: prefix, head
+  logical, optional, intent(in)              :: solver, global_num
+  !
+  integer(psb_ipk_)  :: i, j, il1, iln, lname, lev
+  integer(psb_ipk_)  :: iam, np
+  type(psb_ctxt_type)   :: ctxt
+  character(len=80)  :: prefix_
+  character(len=120) :: fname ! len should be at least 20 more than
+  logical :: solver_, global_num_
+  !  len of prefix_
+
+  info = 0
+
+  if (present(prefix)) then
+    prefix_ = trim(prefix(1:min(len(prefix),len(prefix_))))
+  else
+    prefix_ = "dump_ainv_d"
+  end if
+
+  ctxt = desc%get_context()
+  call psb_info(ctxt,iam,np)
+
+  if (present(solver)) then
+    solver_ = solver
+  else
+    solver_ = .false.
+  end if
+  if (present(global_num)) then
+    global_num_ = global_num
+  else
+    global_num_ = .false.
+  end if
+  lname = len_trim(prefix_)
+  fname = trim(prefix_)
+  write(fname(lname+1:lname+5),'(a,i3.3)') '_p',iam
+  lname = lname + 5
+
+  if (solver_) then
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_wmat.mtx'
+    if (sv%w%is_asb()) &
+         & call sv%w%print(fname,head=head)
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_diag.mtx'
+    if (allocated(sv%d)) &
+         & call psb_geprt(fname,sv%d,head=head)
+    write(fname(lname+1:),'(a,i3.3,a)')'_l',level,'_zmat.mtx'
+    if (sv%z%is_asb()) &
+         & call sv%z%print(fname,head=head)
+  end if
+
+end subroutine amg_z_base_ainv_solver_dmp

amgprec/impl/solver/amg_z_base_ainv_solver_free.f90

@@ -0,0 +1,70 @@
+!  
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_base_ainv_solver_free(sv,info)
+
+  use psb_base_mod
+  use amg_z_base_ainv_mod, amg_protect_name => amg_z_base_ainv_solver_free
+
+  Implicit None
+
+  ! Arguments
+  class(amg_z_base_ainv_solver_type), intent(inout) :: sv
+  integer(psb_ipk_), intent(out)                    :: info
+  !
+  integer(psb_ipk_) :: err_act
+  character(len=20) :: name='amg_z_base_ainv_solver_free'
+
+  call psb_erractionsave(err_act)
+  info = psb_success_
+  call sv%clear_data(info)
+
+  if (allocated(sv%d)) then
+    deallocate(sv%d,stat=info)
+    if (info /= psb_success_) then
+      info = psb_err_alloc_dealloc_
+      call psb_errpush(info,name)
+      goto 9999
+    end if
+  end if
+  call sv%w%free()
+  call sv%z%free()
+  call sv%dv%free(info)
+
+  call psb_erractionrestore(err_act)
+  return
+
+9999 call psb_error_handler(err_act)
+  return
+end subroutine amg_z_base_ainv_solver_free

amgprec/impl/solver/amg_z_base_ainv_update_a.f90

@@ -0,0 +1,81 @@
+!
+!
+!                       AMG-AINV: Approximate Inverse plugin for
+!                             AMG4PSBLAS version 1.0
+!
+!    (C) Copyright 2020
+!
+!                        Salvatore Filippone  University of Rome Tor Vergata
+!
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the AMG4PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!
+!
+subroutine amg_z_base_ainv_update_a(sv,x,desc_data,info)
+  use amg_z_base_ainv_mod, amg_protect_name => amg_z_base_ainv_update_a
+  use psb_base_mod
+
+  implicit none
+
+  type(psb_desc_type), intent(in)            :: desc_data
+  class(amg_z_base_ainv_solver_type), intent(inout) :: sv
+  complex(psb_dpk_),intent(in)                  :: x(:)
+  integer(psb_ipk_), intent(out)             :: info
+
+  ! Local variables
+  complex(psb_dpk_), allocatable   :: dd(:), ee(:)
+  integer(psb_ipk_) :: nrows, ncols, i, j, k, nzr, nzc, ir, ic
+
+  type(psb_z_csc_sparse_mat) :: ac
+  type(psb_z_csr_sparse_mat) :: ar
+
+  dd = sv%dv%get_vect()
+  if (size(x)<size(dd)) then
+    write(0,*) 'Wrong size in update',size(x),size(dd)
+    info = -1
+    return
+  end if
+
+  ee = x(1:size(dd))
+  call sv%z%cp_to(ac)
+  call sv%w%cp_to(ar)
+  ! Compute diag(W ee Z)
+  ! First  ee Z
+  call ac%scal(ee,info,side='L')
+  ! Then  diag(W (ee Z))
+  do i=1,ar%get_nrows()
+    ir  = ar%irp(i);  nzr = ar%irp(i+1)-ar%irp(i)
+    ic  = ac%icp(i);  nzc = ac%icp(i+1)-ac%icp(i)
+    ee(i) = psb_spdot_srtd(&
+         & nzr,ar%ja(ir:ir+nzr-1),ar%val(ir:ir+nzr-1),&
+         & nzc,ac%ia(ic:ic+nzc-1),ac%val(ic:ic+nzc-1))
+  end do
+  ! Now invert diagonal
+  dd = done/dd
+  dd = dd + ee
+  dd = done/dd
+  sv%d = dd
+  call sv%dv%bld(dd,mold=sv%dv%v)
+
+end subroutine amg_z_base_ainv_update_a