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psblas3/ext/impl/psb_z_dia_csmv.f90

136 lines
4.0 KiB
Fortran

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