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! { dg-do run }
! Test the fix for PR25746, in which dependency checking was not being
! done for elemental subroutines and therefore for interface assignments.
!
! This test is based on
! http://home.comcast.net/~kmbtib/Fortran_stuff/elem_assign.f90
! as reported by Harald Anlauf <anlauf@gmx.de> in the PR.
!
module elem_assign
implicit none
type mytype
integer x
end type mytype
interface assignment(=)
module procedure myassign
end interface assignment(=)
contains
elemental subroutine myassign(x,y)
type(mytype), intent(out) :: x
type(mytype), intent(in) :: y
! Multiply the components by 2 to verify that this is being called.
x%x = y%x*2
end subroutine myassign
end module elem_assign
program test
use elem_assign
implicit none
type(mytype) :: y(6), x(6) = (/mytype(1),mytype(20),mytype(300),&
mytype(4000),mytype(50000),&
mytype(1000000)/)
type(mytype) :: z(2, 3)
! The original case - dependency between lhs and rhs.
x = x((/2,3,1,4,5,6/))
if (any(x%x .ne. (/40, 600, 2, 8000, 100000, 2000000/))) STOP 1
! Slightly more elborate case with non-trivial array ref on lhs.
x(4:1:-1) = x((/1,3,2,4/))
if (any(x%x .ne. (/16000, 1200, 4, 80, 100000, 2000000/))) STOP 2
! Check that no-dependence case works....
y = x
if (any(y%x .ne. (/32000, 2400, 8, 160, 200000, 4000000/))) STOP 3
! ...and now a case that caused headaches during the preparation of the patch
x(2:5) = x(1:4)
if (any(x%x .ne. (/16000, 32000, 2400, 8, 160, 2000000/))) STOP 4
! Check offsets are done correctly in multi-dimensional cases
z = reshape (x, (/2,3/))
z(:, 3:2:-1) = z(:, 1:2)
y = reshape (z, (/6/))
if (any(y%x .ne. (/ 64000, 128000, 19200, 64, 128000, 256000/))) STOP 5
end program test
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