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amg4psblas/amgprec/impl/solver/amg_s_base_ainv_solver_appl...

154 lines
5.1 KiB
Fortran

!
!
! 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