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! { dg-do run }
! { dg-options "-fdump-tree-original " }
! Checks the fix for PR46896, in which the optimization that passes
! the argument of TRANSPOSE directly missed the possible aliasing
! through host association.
!
! Contributed by Jerry DeLisle <jvdelisle@gcc.gnu.org>
!
module mod
integer :: b(2,3) = reshape([1,2,3,4,5,6], [2,3])
contains
subroutine msub(x)
integer :: x(:,:)
b(1,:) = 99
b(2,:) = x(:,1)
if (any (b(:,1) /= [99, 1]).or.any (b(:,2) /= [99, 3])) call abort()
end subroutine msub
subroutine pure_msub(x, y)
integer, intent(in) :: x(:,:)
integer, intent(OUT) :: y(size (x, 2), size (x, 1))
y = transpose (x)
end subroutine pure_msub
end
use mod
integer :: a(2,3) = reshape([1,2,3,4,5,6], [2,3])
call impure
call purity
contains
!
! pure_sub and pure_msub could be PURE, if so declared. They do not
! need a temporary.
!
subroutine purity
integer :: c(2,3)
call pure_sub(transpose(a), c)
if (any (c .ne. a)) call abort
call pure_msub(transpose(b), c)
if (any (c .ne. b)) call abort
end subroutine purity
!
! sub and msub both need temporaries to avoid aliasing.
!
subroutine impure
call sub(transpose(a))
end subroutine impure
subroutine sub(x)
integer :: x(:,:)
a(1,:) = 88
a(2,:) = x(:,1)
if (any (a(:,1) /= [88, 1]).or.any (a(:,2) /= [88, 3])) call abort()
end subroutine sub
subroutine pure_sub(x, y)
integer, intent(in) :: x(:,:)
integer, intent(OUT) :: y(size (x, 2), size (x, 1))
y = transpose (x)
end subroutine pure_sub
end
!
! The check below for temporaries gave 14 and 33 for "parm" and "atmp".
!
! { dg-final { scan-tree-dump-times "parm" 66 "original" } }
! { dg-final { scan-tree-dump-times "atmp" 12 "original" } }
! { dg-final { cleanup-tree-dump "original" } }
! { dg-final { cleanup-modules "mod" } }
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