[Bug tree-optimization/61742] New: wrong code at -O3 on x86_64-linux-gnu

[Bug tree-optimization/61742] New: wrong code at -O3 on x86_64-linux-gnu

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61742

            Bug ID: 61742
           Summary: wrong code at -O3 on x86_64-linux-gnu
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The current gcc trunk miscompiles the following testcase on x86_64-linux at -O3
in both 32-bit and 64-bit modes.  

This is a regression from 4.9.x.  

$ gcc-trunk -v 
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.10.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 4.10.0 20140707 (experimental) [trunk revision 212329] (GCC) 
$ 
$ gcc-trunk -O2 small.c; a.out
1
$ gcc-4.9 -O3 small.c; a.out
1
$ 
$ gcc-trunk -O3 small.c; a.out
0
$ 


---------------------------------


int printf (const char *, ...);

int a, b, c, e, f, g, h, i, j, k;
int d[1];

int
main ()
{
  int l, m;
  k = 0;
  for (; g < 1; g++)
    {
      for (i = 0; i < 1; i++)
    m = b ? b : 1;
      if (m)
    j = d[e] = 0;
      else
    f = 0;
      l = k ? k : a;
      if (d[0] < 1)
    {
      c++;
      h = (l || e) > 0;
    }
    }
  printf ("%d\n", c);
  return 0;
}

[Bug tree-optimization/61742] [4.10 Regression] wrong code at -O3 on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61742

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-07-08
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |kyukhin at gcc dot gnu.org,
                   |                            |ysrumyan at gmail dot com
   Target Milestone|---                         |4.10.0
            Summary|wrong code at -O3 on        |[4.10 Regression] wrong
                   |x86_64-linux-gnu            |code at -O3 on
                   |                            |x86_64-linux-gnu
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r209972.

[Bug tree-optimization/61742] [4.10 Regression] wrong code at -O3 on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61742

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
           Priority|P3                          |P1

[Bug tree-optimization/61742] [4.10 Regression] wrong code at -O3 on x86_64-linux-gnu

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61742

--- Comment #2 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
This is duplicate of PR 61576 and it should pass after r212347.

[Bug tree-optimization/61742] [4.10 Regression] wrong code at -O3 on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61742

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Indeed, it is.  Can you add the testcase from this PR to trunk?  Then we can
close it.

[Bug tree-optimization/61742] [4.10 Regression] wrong code at -O3 on x86_64-linux-gnu

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61742

--- Comment #4 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
Ok. I will add it.

2014-07-08 14:45 GMT+04:00 jakub at gcc dot gnu.org <gcc-bugzilla@gcc.gnu.org>:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61742
>
> --- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> Indeed, it is.  Can you add the testcase from this PR to trunk?  Then we can
> close it.
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.

[Bug tree-optimization/61742] [4.10 Regression] wrong code at -O3 on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61742

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Thanks.