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kronmult1.F90
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kronmult1.F90
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subroutine kronmult1( nrow1,ncol1,A1,ldA1, nvec,X,Y)
use prec_mod
implicit none
! ------------------
! compute Y = A1 * X
! ------------------
integer, intent(in) :: nrow1, ncol1, nvec, ldA1
ZTYPE, intent(in) :: A1(ldA1,ncol1)
ZTYPE, intent(in) :: X(ncol1,nvec)
ZTYPE, intent(inout) :: Y(nrow1,nvec)
integer, parameter :: nb = 64
integer :: istart,iend,isize
integer :: jstart,jend,jsize
integer :: mm,nn,kk,ld1,ld2,ld3
ZTYPE, DIMENSION(2) :: alphabeta
alphabeta(1) = 1 ! alpha
alphabeta(2) = 0 ! beta
mm = nrow1
nn = nvec
kk = ncol1
ld1 = size(A1,1)
ld2 = size(X,1)
ld3 = size(Y,1)
#ifdef _OPENACC
!$acc data pcopyin(A1,X) pcopyout(Y) &
!$acc& pcopyin(alphabeta,mm,nn,kk,ld1,ld2,ld3)
#elif OMP_TARGET
!$omp target data map(to:A1,X) map(from:Y) &
!$omp& map(to:alphabeta,mm,nn,kk,ld1,ld2,ld3)
#endif
#ifdef _OPENACC
!$acc kernels present(A1,X,Y)
!$acc loop independent gang collapse(2) &
!$acc& private(iend,jend,isize,jsize)
#elif OMP_TARGET
!$omp target teams
!$omp distribute collapse(2) &
!$omp& private(iend,jend,isize,jsize)
#else
!$omp parallel do shared(A1,X,Y,mm,nn,kk,alphabeta,ld1,ld2,ld3) &
!$omp& private(iend,jend,isize,jsize)
#endif
do jstart=1,nn,nb
do istart=1,mm,nb
jend = min(nn,jstart+nb-1)
iend = min(mm,istart+nb-1)
isize = (iend-istart+1)
jsize = (jend-jstart+1)
call GEMM( 'N','N', isize,jsize,kk, &
& alphabeta(1), A1(istart,1),ld1, X(1,jstart), ld2, &
& alphabeta(2), Y(istart,jstart), ld3 )
enddo
enddo
#ifdef _OPENACC
!$acc end loop
!$acc end kernels
#elif OMP_TARGET
!$omp end target teams
#else
!$omp end parallel do
#endif
#ifdef _OPENACC
!$acc end data
#elif OMP_TARGET
!$omp end target data
#endif
return
end subroutine kronmult1