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! { dg-do run }
module e_51_2_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) call abort
end do
end subroutine
subroutine vec_mult (N)
real :: p(N), v1(N), v2(N)
integer :: i, N
call init (v1, v2, N)
!$omp target data map(from: p)
!$omp target map(to: v1, v2 )
!$omp parallel do
do i = 1, N
p(i) = v1(i) * v2(i)
end do
!$omp end target
call init_again (v1, v2, N)
!$omp target map(to: v1, v2 )
!$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_51_2
use e_51_2_mod, only : vec_mult
integer :: n
n = 1000
call vec_mult (n)
end program
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