36 lines
573 B
Fortran
36 lines
573 B
Fortran
! { dg-do run }
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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, sum
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call redsub (sum, 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 (sum.ne.vsum) call abort ()
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end program reduction
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subroutine redsub(sum, n, c)
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integer :: sum, n, c
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integer :: s
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s = 0
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!$acc parallel vector_length(32) copyin (n, c) copy (s) num_gangs(1)
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!$acc loop reduction(+:s)
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do i = 1, n
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s = s + c
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end do
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!$acc end parallel
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sum = s
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end subroutine redsub
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