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242 lines
6.8 KiB
Fortran
242 lines
6.8 KiB
Fortran
!
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!
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! AMG4PSBLAS version 1.0
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! Algebraic Multigrid Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.7)
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!
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! (C) Copyright 2021
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!
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! Salvatore Filippone
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! Pasqua D'Ambra
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! Fabio Durastante
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the AMG4PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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! POSSIBILITY OF SUCH DAMAGE.
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!
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!
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subroutine amg_s_diag_solver_apply(alpha,sv,x,beta,y,desc_data,&
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& trans,work,info,init,initu)
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use psb_base_mod
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use amg_s_diag_solver, amg_protect_name => amg_s_diag_solver_apply
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implicit none
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type(psb_desc_type), intent(in) :: desc_data
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class(amg_s_diag_solver_type), intent(inout) :: sv
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real(psb_spk_), intent(inout) :: x(:)
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real(psb_spk_), intent(inout) :: y(:)
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real(psb_spk_),intent(in) :: alpha,beta
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character(len=1),intent(in) :: trans
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real(psb_spk_),target, intent(inout) :: work(:)
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integer(psb_ipk_), intent(out) :: info
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character, intent(in), optional :: init
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real(psb_spk_),intent(inout), optional :: initu(:)
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integer(psb_ipk_) :: n_row,n_col
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real(psb_spk_), pointer :: ww(:), aux(:), tx(:),ty(:)
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type(psb_ctxt_type) :: ctxt
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integer(psb_ipk_) :: np, me, i, err_act
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character :: trans_
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character(len=20) :: name='s_diag_solver_apply'
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call psb_erractionsave(err_act)
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info = psb_success_
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trans_ = psb_toupper(trans)
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select case(trans_)
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case('N')
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case('T','C')
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case default
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call psb_errpush(psb_err_iarg_invalid_i_,name)
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goto 9999
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end select
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!
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! For non-iterative solvers, init and initu are ignored.
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!
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n_row = desc_data%get_local_rows()
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n_col = desc_data%get_local_cols()
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if (trans_ == 'C') then
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if (beta == szero) then
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if (alpha == szero) then
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y(1:n_row) = szero
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else if (alpha == sone) then
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do i=1, n_row
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y(i) = (sv%d(i)) * x(i)
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end do
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else if (alpha == -sone) then
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do i=1, n_row
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y(i) = -(sv%d(i)) * x(i)
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end do
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else
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do i=1, n_row
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y(i) = alpha * (sv%d(i)) * x(i)
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end do
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end if
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else if (beta == sone) then
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if (alpha == szero) then
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!y(1:n_row) = szero
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else if (alpha == sone) then
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do i=1, n_row
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y(i) = (sv%d(i)) * x(i) + y(i)
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end do
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else if (alpha == -sone) then
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do i=1, n_row
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y(i) = -(sv%d(i)) * x(i) + y(i)
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end do
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else
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do i=1, n_row
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y(i) = alpha * (sv%d(i)) * x(i) + y(i)
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end do
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end if
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else if (beta == -sone) then
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if (alpha == szero) then
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y(1:n_row) = -y(1:n_row)
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else if (alpha == sone) then
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do i=1, n_row
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y(i) = (sv%d(i)) * x(i) - y(i)
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end do
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else if (alpha == -sone) then
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do i=1, n_row
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y(i) = -(sv%d(i)) * x(i) - y(i)
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end do
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else
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do i=1, n_row
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y(i) = alpha * (sv%d(i)) * x(i) - y(i)
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end do
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end if
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else
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if (alpha == szero) then
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y(1:n_row) = beta *y(1:n_row)
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else if (alpha == sone) then
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do i=1, n_row
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y(i) = (sv%d(i)) * x(i) + beta*y(i)
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end do
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else if (alpha == -sone) then
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do i=1, n_row
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y(i) = -(sv%d(i)) * x(i) + beta*y(i)
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end do
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else
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do i=1, n_row
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y(i) = alpha * (sv%d(i)) * x(i) + beta*y(i)
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end do
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end if
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end if
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else if (trans_ /= 'C') then
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if (beta == szero) then
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if (alpha == szero) then
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y(1:n_row) = szero
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else if (alpha == sone) then
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do i=1, n_row
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y(i) = sv%d(i) * x(i)
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end do
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else if (alpha == -sone) then
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do i=1, n_row
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y(i) = -sv%d(i) * x(i)
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end do
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else
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do i=1, n_row
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y(i) = alpha * sv%d(i) * x(i)
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end do
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end if
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else if (beta == sone) then
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if (alpha == szero) then
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!y(1:n_row) = szero
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else if (alpha == sone) then
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do i=1, n_row
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y(i) = sv%d(i) * x(i) + y(i)
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end do
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else if (alpha == -sone) then
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do i=1, n_row
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y(i) = -sv%d(i) * x(i) + y(i)
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end do
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else
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do i=1, n_row
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y(i) = alpha * sv%d(i) * x(i) + y(i)
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end do
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end if
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else if (beta == -sone) then
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if (alpha == szero) then
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y(1:n_row) = -y(1:n_row)
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else if (alpha == sone) then
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do i=1, n_row
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y(i) = sv%d(i) * x(i) - y(i)
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end do
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else if (alpha == -sone) then
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do i=1, n_row
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y(i) = -sv%d(i) * x(i) - y(i)
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end do
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else
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do i=1, n_row
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y(i) = alpha * sv%d(i) * x(i) - y(i)
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end do
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end if
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else
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if (alpha == szero) then
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y(1:n_row) = beta *y(1:n_row)
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else if (alpha == sone) then
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do i=1, n_row
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y(i) = sv%d(i) * x(i) + beta*y(i)
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end do
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else if (alpha == -sone) then
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do i=1, n_row
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y(i) = -sv%d(i) * x(i) + beta*y(i)
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end do
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else
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do i=1, n_row
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y(i) = alpha * sv%d(i) * x(i) + beta*y(i)
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end do
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end if
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end if
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end if
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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end subroutine amg_s_diag_solver_apply
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