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78 lines
1.7 KiB
Fortran
78 lines
1.7 KiB
Fortran
! { dg-do run }
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module e_52_2_mod
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contains
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subroutine init (v1, v2, N)
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integer :: i, N
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real :: v1(N), v2(N)
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do i = 1, N
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v1(i) = i + 2.0
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v2(i) = i - 3.0
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end do
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end subroutine
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subroutine init_again (v1, v2, N)
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integer :: i, N
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real :: v1(N), v2(N)
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do i = 1, N
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v1(i) = i - 3.0
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v2(i) = i + 2.0
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end do
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end subroutine
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subroutine check (p, N)
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integer :: i, N
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real, parameter :: EPS = 0.00001
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real :: diff, p(N)
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do i = 1, N
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diff = p(i) - (i * i + (i + 2.0) * (i - 3.0))
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if (diff > EPS .or. -diff > EPS) STOP 1
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end do
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end subroutine
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logical function maybe_init_again (v, N)
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real :: v(N)
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integer :: i, N
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do i = 1, N
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v(i) = i
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end do
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maybe_init_again = .true.
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end function
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subroutine vec_mult (p, v1, v2, N)
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real :: p(N), v1(N), v2(N)
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integer :: i, N
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logical :: changed
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call init (v1, v2, N)
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!$omp target data map(to: v1, v2) map(from: p)
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!$omp target
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!$omp parallel do
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do i = 1, N
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p(i) = v1(i) * v2(i)
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end do
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!$omp end target
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changed = maybe_init_again (v1, N)
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!$omp target update if(changed) to(v1(:N))
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changed = maybe_init_again (v2, N)
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!$omp target update if(changed) to(v2(:N))
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!$omp target
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!$omp parallel do
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do i = 1, N
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p(i) = p(i) + v1(i) * v2(i)
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end do
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!$omp end target
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!$omp end target data
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call check (p, N)
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end subroutine
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end module
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program e_52_2
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use e_52_2_mod, only : vec_mult
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integer :: n
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real, pointer :: p(:), v1(:), v2(:)
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n = 1000
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allocate (p(n), v1(n), v2(n))
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call vec_mult (p, v1, v2, n)
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deallocate (p, v1, v2)
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end program
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