libgomp/testsuite/libgomp.fortran/examples-4/teams-3.f90

   1 ! { dg-do run }
   2
   3 function dotprod_ref (B, C, N) result (sum)
   4   implicit none
   5   real :: B(N), C(N), sum
   6   integer :: N, i
   7   sum = 0.0e0
   8   do i = 1, N
   9     sum = sum + B(i) * C(i)
  10   end do
  11 end function
  12
  13 function dotprod (B, C, N) result(sum)
  14   real :: B(N), C(N), sum
  15   integer :: N, i
  16   sum = 0.0e0
  17   !$omp target teams map(to: B, C) map(tofrom: sum) &
  18   !$omp& reduction(+:sum)
  19     !$omp distribute parallel do reduction(+:sum)
  20     do i = 1, N
  21       sum = sum + B(i) * C(i)
  22     end do
  23   !$omp end target teams
  24 end function
  25
  26 subroutine init (B, C, N)
  27   real :: B(N), C(N)
  28   integer :: N, i
  29   do i = 1, N
  30     B(i) = 0.0001 * i
  31     C(i) = 0.000001 * i * i
  32   end do
  33 end subroutine
  34
  35 subroutine check (a, b)
  36   real :: a, b, err
  37   real, parameter :: EPS = 0.0001
  38   if (b == 0.0) then
  39     err = a
  40   else if (a == 0.0) then
  41     err = b
  42   else
  43     err = (a - b) / b
  44   end if
  45   if (err > EPS .or. err < -EPS) call abort
  46 end subroutine
  47
  48 program e_54_3
  49   integer :: n
  50   real :: ref, d
  51   real, pointer, dimension(:) :: B, C
  52   n = 1024 * 1024
  53   allocate (B(n), C(n))
  54   call init (B, C, n)
  55   ref = dotprod_ref (B, C, n)
  56   d = dotprod (B, C, n)
  57   call check (ref, d)
  58   deallocate (B, C)
  59 end program