amg4psblas/amgprec/impl/solver/amg_z_diag_solver_bld.f90

!  
!   
!                             AMG4PSBLAS version 1.0
!    Algebraic Multigrid Package
!               based on PSBLAS (Parallel Sparse BLAS version 3.7)
!    
!    (C) Copyright 2021 
!  
!        Salvatore Filippone  
!        Pasqua D'Ambra   
!        Fabio Durastante        
!   
!    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_diag_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
  
  use psb_base_mod
  use amg_z_diag_solver, amg_protect_name => amg_z_diag_solver_bld

  Implicit None

  ! Arguments
  type(psb_zspmat_type), intent(in), target           :: a
  Type(psb_desc_type), Intent(inout)                  :: desc_a 
  class(amg_z_diag_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(:)
  complex(psb_dpk_), allocatable :: tdb(:)
  type(psb_ctxt_type) :: ctxt
  integer(psb_ipk_)   :: np, me, i, err_act, debug_unit, debug_level
  character(len=20)   :: name='z_diag_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'


  n_row  = desc_a%get_local_rows()
  nrow_a = a%get_nrows()

  sv%d = a%get_diag(info)
  if (info == psb_success_) call psb_realloc(n_row,sv%d,info)
  if (present(b)) then 
    tdb=b%get_diag(info)
    if (size(tdb)+nrow_a > n_row) call psb_realloc(nrow_a+size(tdb),sv%d,info)
    if (info == psb_success_) sv%d(nrow_a+1:nrow_a+size(tdb)) = tdb(:)
  end if
  if (info /= psb_success_) then 
    call psb_errpush(psb_err_from_subroutine_,name,a_err='get_diag')
    goto 9999      
  end if

  do i=1,n_row
    if (sv%d(i) == zzero) then 
      sv%d(i) = zone
    else
      sv%d(i) = zone/sv%d(i)
    end if
  end do
  allocate(sv%dv,stat=info) 
  if (info == psb_success_) then 
    call sv%dv%bld(sv%d)
    if (present(vmold)) call sv%dv%cnv(vmold)
    call sv%dv%sync()
  else
    call psb_errpush(psb_err_from_subroutine_,name,& 
         & a_err='Allocate sv%dv')
    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_diag_solver_bld


subroutine amg_z_l1_diag_solver_bld(a,desc_a,sv,info,b,amold,vmold,imold)
  
  use psb_base_mod
  use amg_z_l1_diag_solver, amg_protect_name => amg_z_l1_diag_solver_bld

  Implicit None

  ! Arguments
  type(psb_zspmat_type), intent(in), target           :: a
  Type(psb_desc_type), Intent(inout)                  :: desc_a 
  class(amg_z_l1_diag_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_), allocatable :: tdb(:), tx(:), ty(:) 
  type(psb_ctxt_type) :: ctxt
  integer(psb_ipk_)   :: np, me, i, err_act, debug_unit, debug_level
  character(len=20)   :: name='z_l1_diag_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'


  n_row  = desc_a%get_local_rows()
  nrow_a = a%get_nrows()

  tx   = a%get_diag(info)
  sv%d = a%arwsum(info)
  sv%d(:) = sv%d(:) - abs(tx(:)) + tx(:) 
  if (info == psb_success_) call psb_realloc(n_row,sv%d,info)
  if (present(b)) then 
    tdb=b%arwsum(info)
    ty =b%get_diag(info)
    if (size(tdb)+nrow_a > n_row) call psb_realloc(nrow_a+size(tdb),sv%d,info)
    if (info == psb_success_) sv%d(nrow_a+1:nrow_a+size(tdb)) = tdb(:) - abs(ty(:)) + ty(:)
  end if
  if (info /= psb_success_) then 
    call psb_errpush(psb_err_from_subroutine_,name,a_err='arwsum')
    goto 9999      
  end if

  do i=1,n_row
    if (sv%d(i) == zzero) then 
      sv%d(i) = zone
    else
      sv%d(i) = zone/sv%d(i)
    end if
  end do
  allocate(sv%dv,stat=info) 
  if (info == psb_success_) then 
    call sv%dv%bld(sv%d)
    if (present(vmold)) call sv%dv%cnv(vmold)
    call sv%dv%sync()
  else
    call psb_errpush(psb_err_from_subroutine_,name,& 
         & a_err='Allocate sv%dv')
    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_l1_diag_solver_bld