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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  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/))) call abort ()

! 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/))) call abort ()

! Check that no-dependence case works....

   y = x

   if (any(y%x .ne. (/32000, 2400, 8, 160, 200000, 4000000/))) call abort ()

! ...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/))) call abort ()

! 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/))) call abort ()

end program test

! { dg-final { cleanup-modules "elem_assign" } }