[Bug tree-optimization/46491] New: [4.3/4.4/4.5 Regression] ipa-pure-const.c miscompilation

[Bug tree-optimization/46491] New: [4.3/4.4/4.5 Regression] ipa-pure-const.c miscompilation

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491

           Summary: [4.3/4.4/4.5 Regression] ipa-pure-const.c
                    miscompilation
           Product: gcc
           Version: 4.5.2
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: jakub@gcc.gnu.org
        ReportedBy: jakub@gcc.gnu.org


extern void abort (void);

__attribute__((noinline)) int
foo (int *p)
{
  int r;
  asm ("movl $6, (%1)\n\txorl %0, %0" : "=r" (r) : "r" (p) : "memory");
  return r;
}

int
main (void)
{
  int p = 8;
  if ((foo (&p) ? : p) != 6)
    abort ();
  return 0;
}

is miscompiled with -O2 in 4.5 (and with -O2 -fno-ipa-reference in
4.1/4.2/4.3/4.4).

[Bug tree-optimization/46491] [4.3/4.4/4.5 Regression] ipa-pure-const.c miscompilation

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2010.11.15 19:59:56
      Known to work|                            |4.0.0, 4.6.0
   Target Milestone|---                         |4.3.6
     Ever Confirmed|0                           |1
      Known to fail|                            |4.4.5, 4.5.1

[Bug tree-optimization/46491] [4.3/4.4/4.5 Regression] ipa-pure-const.c miscompilation

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-15 22:27:29 UTC ---
Author: jakub
Date: Mon Nov 15 22:27:24 2010
New Revision: 166774

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=166774
Log:
    PR tree-optimization/46491
    Backport from mainline

    2010-05-14  Jan Hubicka  <jh@suse.cz>
    * ipa-pure-const.c (check_stmt): Do not use memory_identifier_string.

    * gcc.target/i386/pr46491.c: New test.

Added:
    branches/gcc-4_5-branch/gcc/testsuite/gcc.target/i386/pr46491.c
Modified:
    branches/gcc-4_5-branch/gcc/ChangeLog
    branches/gcc-4_5-branch/gcc/ipa-pure-const.c
    branches/gcc-4_5-branch/gcc/testsuite/ChangeLog

[Bug tree-optimization/46491] [4.3/4.4/4.5 Regression] ipa-pure-const.c miscompilation

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-15 22:31:52 UTC ---
Author: jakub
Date: Mon Nov 15 22:31:47 2010
New Revision: 166777

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=166777
Log:
    PR tree-optimization/46491
    * gcc.target/i386/pr46491.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr46491.c
Modified:
    trunk/gcc/testsuite/ChangeLog

[Bug tree-optimization/46491] [4.3/4.4 Regression] ipa-pure-const.c miscompilation

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.5.2
            Summary|[4.3/4.4/4.5 Regression]    |[4.3/4.4 Regression]
                   |ipa-pure-const.c            |ipa-pure-const.c
                   |miscompilation              |miscompilation

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-15 22:36:27 UTC ---
Fixed for 4.5 so far, testcase applied to trunk as well.

[Bug tree-optimization/46491] [4.3/4.4 Regression] ipa-pure-const.c miscompilation

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-04-07 21:25:51 UTC ---
Author: jakub
Date: Thu Apr  7 21:25:47 2011
New Revision: 172129

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=172129
Log:
    PR tree-optimization/46491
    Backported from mainline
    2010-05-14  Jan Hubicka  <jh@suse.cz>
    * ipa-pure-const.c (check_stmt): Do not use memory_identifier_string.

2011-04-07  Jakub Jelinek  <jakub@redhat.com>

    Backported from mainline
    2010-11-15  Jakub Jelinek  <jakub@redhat.com>

    PR tree-optimization/46491
    * gcc.target/i386/pr46491.c: New test.

Added:
    branches/gcc-4_4-branch/gcc/testsuite/gcc.target/i386/pr46491.c
Modified:
    branches/gcc-4_4-branch/gcc/ChangeLog
    branches/gcc-4_4-branch/gcc/ipa-pure-const.c
    branches/gcc-4_4-branch/gcc/testsuite/ChangeLog

[Bug tree-optimization/46491] [4.3 Regression] ipa-pure-const.c miscompilation

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2

[Bug tree-optimization/46491] [4.3 Regression] ipa-pure-const.c miscompilation

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46491

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|4.3.6                       |4.4.6

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-06-27 12:00:06 UTC ---
Fixed for 4.4.6.