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https://github.com/autc04/Retro68.git
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66 lines
1.5 KiB
Fortran
66 lines
1.5 KiB
Fortran
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! { dg-do run }
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function dotprod_ref (B, C, N) result (sum)
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implicit none
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real :: B(N), C(N), sum
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integer :: N, i
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sum = 0.0e0
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do i = 1, N
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sum = sum + B(i) * C(i)
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end do
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end function
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function dotprod (B, C, N, block_size, num_teams, block_threads) result (sum)
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implicit none
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real :: B(N), C(N), sum
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integer :: N, block_size, num_teams, block_threads, i, i0
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sum = 0.0e0
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!$omp target map(to: B, C, block_size, num_teams, block_threads)
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!$omp teams num_teams(num_teams) thread_limit(block_threads) &
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!$omp& reduction(+:sum)
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!$omp distribute
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do i0 = 1, N, block_size
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!$omp parallel do reduction(+:sum)
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do i = i0, min (i0 + block_size - 1, N)
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sum = sum + B(i) * C(i)
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end do
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end do
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!$omp end teams
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!$omp end target
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end function
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subroutine init (B, C, N)
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real :: B(N), C(N)
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integer :: N, i
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do i = 1, N
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B(i) = 0.0001 * i
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C(i) = 0.000001 * i * i
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end do
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end subroutine
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subroutine check (a, b)
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real :: a, b, err
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real, parameter :: EPS = 0.0001
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if (b == 0.0) then
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err = a
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else if (a == 0.0) then
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err = b
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else
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err = (a - b) / b
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end if
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if (err > EPS .or. err < -EPS) call abort
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end subroutine
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program e_54_1
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integer :: n
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real :: ref, d
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real, pointer, dimension(:) :: B, C
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n = 1024 * 1024
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allocate (B(n), C(n))
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call init (B, C, n)
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ref = dotprod_ref (B, C, n)
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d = dotprod (B, C, n, n / 8, 2, 8)
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call check (ref, d)
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deallocate (B, C)
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end program
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