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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/63851] New: ipa-icf miscompiles gfortran.dg/assumed_rank_(8|9|10).f90 at -O2 and above
Date: Thu, 13 Nov 2014 15:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63851

            Bug ID: 63851
           Summary: ipa-icf miscompiles
                    gfortran.dg/assumed_rank_(8|9|10).f90 at -O2 and above
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dominiq at lps dot ens.fr
                CC: fxcoudert at gcc dot gnu.org, iains at gcc dot gnu.org,
                    marxin at gcc dot gnu.org

On x86_64-apple-darwin14 ipa-icf miscompiles
gfortran.dg/assumed_rank_(8|9|10).f90 at -O2 and above (see pr63622 comment 7).
Reduced test for assumed_rank_8.f90

[Book15] f90/bug% cat assumed_rank_8_red.f90
program main
  implicit none

  interface
    subroutine check (x)
      integer :: x(..)
    end subroutine check
  end interface

  integer, allocatable :: kk
  integer, pointer :: ll

  call g (null())
  kk = 489
  call h (kk)

contains

  subroutine g (x)
    integer, pointer, intent(in) :: x(..)

    call check (x)
  end subroutine

  subroutine h (x)
    integer, allocatable :: x(..)

    call check (x)
  end subroutine

end program main
[Book15] f90/bug% cat assumed_rank_8_c_red.c
/* Called by assumed_rank_8.f90 and assumed_rank_9.f90.  */

#include <stdlib.h>  /* For abort().  */

struct a {
  int *dat;
};

void check_ (struct a *x)
{
  if (*x->dat != 489)
    abort ();
}
[Book15] f90/bug% gfc -O2 assumed_rank_8_red.f90 assumed_rank_8_c_red.c
[Book15] f90/bug% a.out

Program received signal SIGSEGV: Segmentation fault - invalid memory reference.

Backtrace for this error:
#0  0x10ec7a5c2
#1  0x10ec7ad60
#2  0x7fff81c71f19
#3  0x10ec71e73
#4  0x10ec71eb5
Segmentation fault

If I comment the first 'call check (x)', the abort goes away.

A reduced test for assumed_rank_10.f90 (fails only with -m32) has been posted
in pr63622 comment 34.