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100 lines
2.0 KiB
Fortran
100 lines
2.0 KiB
Fortran
! { dg-do run }
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! { dg-additional-options "-w" }
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! subroutine reduction
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program reduction
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integer, parameter :: n = 40, c = 10
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integer :: i, vsum, gs, ws, vs, cs, ns
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call redsub_gang (gs, n, c)
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call redsub_worker (ws, n, c)
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call redsub_vector (vs, n, c)
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call redsub_combined (cs, n, c)
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call redsub_nested (ns, n, c)
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vsum = 0
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! Verify the results
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do i = 1, n
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vsum = vsum + c
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end do
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if (gs .ne. vsum) STOP 1
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if (ws .ne. vsum) STOP 2
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if (vs .ne. vsum) STOP 3
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if (cs .ne. vsum) STOP 4
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if (ns .ne. vsum) STOP 5
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end program reduction
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subroutine redsub_gang(sum, n, c)
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integer :: sum, n, c
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sum = 0
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!$acc parallel copyin (n, c) num_gangs(n) copy(sum)
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!$acc loop reduction(+:sum) gang
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do i = 1, n
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sum = sum + c
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end do
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!$acc end parallel
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end subroutine redsub_gang
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subroutine redsub_worker(sum, n, c)
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integer :: sum, n, c
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sum = 0
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!$acc parallel copyin (n, c) num_workers(4) vector_length (32) copy(sum)
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!$acc loop reduction(+:sum) worker
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do i = 1, n
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sum = sum + c
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end do
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!$acc end parallel
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end subroutine redsub_worker
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subroutine redsub_vector(sum, n, c)
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integer :: sum, n, c
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sum = 0
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!$acc parallel copyin (n, c) vector_length(32) copy(sum)
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!$acc loop reduction(+:sum) vector
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do i = 1, n
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sum = sum + c
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end do
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!$acc end parallel
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end subroutine redsub_vector
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subroutine redsub_combined(sum, n, c)
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integer :: sum, n, c
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sum = 0
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!$acc parallel num_gangs (8) num_workers (4) vector_length(32) copy(sum)
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!$acc loop reduction(+:sum) gang worker vector
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do i = 1, n
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sum = sum + c
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end do
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!$acc end parallel
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end subroutine redsub_combined
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subroutine redsub_nested(sum, n, c)
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integer :: sum, n, c
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integer :: ii, jj
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ii = n / 10;
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jj = 10;
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sum = 0
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!$acc parallel num_gangs (8) copy(sum)
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!$acc loop reduction(+:sum) gang
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do i = 1, ii
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!$acc loop reduction(+:sum) vector
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do j = 1, jj
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sum = sum + c
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end do
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end do
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!$acc end parallel
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end subroutine redsub_nested
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