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136 lines
4.0 KiB
Fortran
136 lines
4.0 KiB
Fortran
1 year ago
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! Parallel Sparse BLAS GPU plugin
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! (C) Copyright 2013
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!
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! Salvatore Filippone
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! Alessandro Fanfarillo
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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 PSBLAS 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 PSBLAS 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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subroutine psb_s_dia_csmv(alpha,a,x,beta,y,info,trans)
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use psb_base_mod
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use psb_s_dia_mat_mod, psb_protect_name => psb_s_dia_csmv
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implicit none
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class(psb_s_dia_sparse_mat), intent(in) :: a
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real(psb_spk_), intent(in) :: alpha, beta, x(:)
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real(psb_spk_), intent(inout) :: y(:)
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integer(psb_ipk_), intent(out) :: info
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character, optional, intent(in) :: trans
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character :: trans_
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integer(psb_ipk_) :: i,j,k,m,n, nnz, ir, jc
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logical :: tra, ctra
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integer(psb_ipk_) :: err_act
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character(len=20) :: name='s_dia_csmv'
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logical, parameter :: debug=.false.
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call psb_erractionsave(err_act)
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info = psb_success_
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if (.not.a%is_asb()) then
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info = psb_err_invalid_mat_state_
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call psb_errpush(info,name)
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goto 9999
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endif
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if (a%is_dev()) call a%sync()
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if (present(trans)) then
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trans_ = trans
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else
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trans_ = 'N'
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end if
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tra = (psb_toupper(trans_) == 'T')
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ctra = (psb_toupper(trans_) == 'C')
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if (tra.or.ctra) then
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m = a%get_ncols()
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n = a%get_nrows()
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else
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n = a%get_ncols()
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m = a%get_nrows()
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end if
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if (size(x,1)<n) then
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info = 36
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call psb_errpush(info,name,i_err=(/3*ione,n/))
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goto 9999
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end if
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if (size(y,1)<m) then
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info = 36
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call psb_errpush(info,name,i_err=(/5*ione,m/))
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goto 9999
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end if
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call psb_s_dia_csmv_inner(m,n,alpha,size(a%data,1,kind=psb_ipk_),&
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& size(a%data,2,kind=psb_ipk_),a%data,a%offset,x,beta,y)
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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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contains
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subroutine psb_s_dia_csmv_inner(m,n,alpha,nr,nc,data,off,&
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&x,beta,y)
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integer(psb_ipk_), intent(in) :: m,n,nr,nc,off(*)
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real(psb_spk_), intent(in) :: alpha, beta, x(*),data(nr,*)
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real(psb_spk_), intent(inout) :: y(*)
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integer(psb_ipk_) :: i,j,k, ir, jc, m4, ir1, ir2
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if (beta == szero) then
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do i = 1, m
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y(i) = szero
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enddo
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else
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do i = 1, m
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y(i) = beta*y(i)
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end do
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endif
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do j=1,nc
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if (off(j) > 0) then
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ir1 = 1
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ir2 = nr - off(j)
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else
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ir1 = 1 - off(j)
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ir2 = nr
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end if
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do i=ir1, ir2
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y(i) = y(i) + alpha*data(i,j)*x(i+off(j))
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enddo
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enddo
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end subroutine psb_s_dia_csmv_inner
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end subroutine psb_s_dia_csmv
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