2017-04-10 11:32:00 +00:00
|
|
|
! { dg-do run }
|
|
|
|
! { dg-additional-options "-w" }
|
|
|
|
|
|
|
|
! subroutine reduction with private and firstprivate variables
|
|
|
|
|
|
|
|
program reduction
|
|
|
|
integer, parameter :: n = 100
|
|
|
|
integer :: i, j, vsum, cs, arr(n)
|
|
|
|
|
|
|
|
call redsub_private (cs, n, arr)
|
|
|
|
call redsub_bogus (cs, n)
|
|
|
|
call redsub_combined (cs, n, arr)
|
|
|
|
|
|
|
|
vsum = 0
|
|
|
|
|
|
|
|
! Verify the results
|
|
|
|
do i = 1, n
|
|
|
|
vsum = i
|
|
|
|
do j = 1, n
|
|
|
|
vsum = vsum + 1;
|
|
|
|
end do
|
2018-12-28 15:30:48 +00:00
|
|
|
if (vsum .ne. arr(i)) STOP 1
|
2017-04-10 11:32:00 +00:00
|
|
|
end do
|
|
|
|
end program reduction
|
|
|
|
|
|
|
|
! This subroutine tests a reduction with an explicit private variable.
|
|
|
|
|
|
|
|
subroutine redsub_private(sum, n, arr)
|
|
|
|
integer :: sum, n, arr(n)
|
|
|
|
integer :: i, j, v
|
|
|
|
|
|
|
|
!$acc parallel copyout (arr)
|
|
|
|
!$acc loop gang private (v)
|
|
|
|
do j = 1, n
|
|
|
|
v = j
|
|
|
|
|
|
|
|
!$acc loop vector reduction (+:v)
|
|
|
|
do i = 1, 100
|
|
|
|
v = v + 1
|
|
|
|
end do
|
|
|
|
|
|
|
|
arr(j) = v
|
|
|
|
end do
|
|
|
|
!$acc end parallel
|
|
|
|
|
|
|
|
! verify the results
|
|
|
|
do i = 1, 10
|
2018-12-28 15:30:48 +00:00
|
|
|
if (arr(i) .ne. 100+i) STOP 2
|
2017-04-10 11:32:00 +00:00
|
|
|
end do
|
|
|
|
end subroutine redsub_private
|
|
|
|
|
|
|
|
|
|
|
|
! Bogus reduction on a firstprivate variable. The results do
|
|
|
|
! survive the parallel region. The goal here is to ensure that gfortran
|
|
|
|
! doesn't ICE.
|
|
|
|
|
|
|
|
subroutine redsub_bogus(sum, n)
|
|
|
|
integer :: sum, n, arr(n)
|
|
|
|
integer :: i
|
|
|
|
|
|
|
|
!$acc parallel firstprivate(sum)
|
|
|
|
!$acc loop gang worker vector reduction (+:sum)
|
|
|
|
do i = 1, n
|
|
|
|
sum = sum + 1
|
|
|
|
end do
|
|
|
|
!$acc end parallel
|
|
|
|
end subroutine redsub_bogus
|
|
|
|
|
|
|
|
! This reduction involving a firstprivate variable yields legitimate results.
|
|
|
|
|
|
|
|
subroutine redsub_combined(sum, n, arr)
|
|
|
|
integer :: sum, n, arr(n)
|
|
|
|
integer :: i, j
|
|
|
|
|
|
|
|
!$acc parallel copy (arr) firstprivate(sum)
|
|
|
|
!$acc loop gang
|
|
|
|
do i = 1, n
|
|
|
|
sum = i;
|
|
|
|
|
|
|
|
!$acc loop reduction(+:sum)
|
|
|
|
do j = 1, n
|
|
|
|
sum = sum + 1
|
|
|
|
end do
|
|
|
|
|
|
|
|
arr(i) = sum
|
|
|
|
end do
|
|
|
|
!$acc end parallel
|
|
|
|
end subroutine redsub_combined
|