[Bug tree-optimization/103873] New: wrong code at -O3 on x86_64-linux-gnu

[Bug tree-optimization/103873] New: wrong code at -O3 on x86_64-linux-gnu

[zhendong.su at inf dot ethz.ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103873

            Bug ID: 103873
           Summary: wrong code at -O3 on x86_64-linux-gnu
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

It appears to be a recent regression.

[568] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++
--disable-werror --disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20211231 (experimental) (GCC) 
[569] % 
[569] % gcctk -O2 small.c; ./a.out
[570] % 
[570] % gcctk -O3 small.c
[571] % ./a.out
Aborted
[572] % 
[572] % cat small.c
int a, b, c, d[3], e, f;
int main() {
  if (b)
    goto L;
  for (; f < 1; f++)
    for (; a < 1; a++) {
      for (c = 0; c < 3; c++)
        for (e = 0; e < 3; e++)
          d[e] |= c;
      for (; b; b++)
      L:;
    }
  if (d[1] != 3)
    __builtin_abort();
  return 0;
}

[Bug tree-optimization/103873] [12 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=103873

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |matz at gcc dot gnu.org
            Summary|wrong code at -O3 on        |[12 Regression] wrong code
                   |x86_64-linux-gnu            |at -O3 on x86_64-linux-gnu
             Status|UNCONFIRMED                 |NEW
            Version|unknown                     |12.0
           Priority|P3                          |P1
   Target Milestone|---                         |12.0
   Last reconfirmed|                            |2021-12-31

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started to ICE with r12-4526-gd8edfadfc7a9795b65177a50ce44fd348858e844
(before it compiled and executed fine) and starting with
r12-5264-gd1ca8aeaf34a717dffd8f4a1f0333d25c7d1c904 it doesn't ICE anymore but
is instead miscompiled.
Perhaps related to PR103300 ?

[Bug tree-optimization/103873] [12 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=103873

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

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

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed by the fix for PR104543.

*** This bug has been marked as a duplicate of bug 104543 ***