| ! { dg-do run } |
| |
| module e_52_1_mod |
| contains |
| subroutine init (v1, v2, N) |
| integer :: i, N |
| real :: v1(N), v2(N) |
| do i = 1, N |
| v1(i) = i + 2.0 |
| v2(i) = i - 3.0 |
| end do |
| end subroutine |
| |
| subroutine init_again (v1, v2, N) |
| integer :: i, N |
| real :: v1(N), v2(N) |
| do i = 1, N |
| v1(i) = i - 3.0 |
| v2(i) = i + 2.0 |
| end do |
| end subroutine |
| |
| subroutine check (p, N) |
| integer :: i, N |
| real, parameter :: EPS = 0.00001 |
| real :: diff, p(N) |
| do i = 1, N |
| diff = p(i) - 2 * (i + 2.0) * (i - 3.0) |
| if (diff > EPS .or. -diff > EPS) stop 1 |
| end do |
| end subroutine |
| |
| subroutine vec_mult (p, v1, v2, N) |
| real :: p(N), v1(N), v2(N) |
| integer :: i, N |
| call init (v1, v2, N) |
| !$omp target data map(to: v1, v2) map(from: p) |
| !$omp target |
| !$omp parallel do |
| do i = 1, N |
| p(i) = v1(i) * v2(i) |
| end do |
| !$omp end target |
| call init_again (v1, v2, N) |
| !$omp target update to(v1, v2) |
| !$omp target |
| !$omp parallel do |
| do i = 1, N |
| p(i) = p(i) + v1(i) * v2(i) |
| end do |
| !$omp end target |
| !$omp end target data |
| call check (p, N) |
| end subroutine |
| end module |
| |
| program e_52_1 |
| use e_52_1_mod, only : vec_mult |
| integer :: n |
| real, pointer :: p(:), v1(:), v2(:) |
| n = 1000 |
| allocate (p(n), v1(n), v2(n)) |
| call vec_mult (p, v1, v2, n) |
| deallocate (p, v1, v2) |
| end program |