[Bug tree-optimization/102636] New: wrong code at -O1 on x86_64-linux-gnu

[Bug tree-optimization/102636] New: wrong code at -O1 on x86_64-linux-gnu

[zhendong.su at inf dot ethz.ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102636

            Bug ID: 102636
           Summary: wrong code at -O1 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: ---

[591] % 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 --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20211007 (experimental) [master r12-4219-g6496ae5c965] (GCC) 
[592] % 
[592] % gcctk -O0 small.c; ./a.out
[593] % gcctk -Os small.c; ./a.out
[594] % gcctk -O2 small.c; ./a.out
[595] % gcctk -O3 small.c; ./a.out
[596] % 
[596] % gcctk -O1 small.c; ./a.out
Aborted
[597] % 
[597] % cat small.c
unsigned a;
int main() {
  unsigned b = 1;
  for (; b < 4; b++) {
    a = (a ^ 2000000000) * -b;
    if (b > a) {
      __builtin_abort ();
    }
    a = 3000000000;
  }
  return 0;
}

[Bug tree-optimization/102636] [12 Regression] wrong code at -O1 on x86_64-linux-gnu since r12-3136

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102636

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |guojiufu at gcc dot gnu.org,
                   |                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |12.0
            Version|unknown                     |12.0
     Ever confirmed|0                           |1
           Priority|P3                          |P1
   Last reconfirmed|                            |2021-10-07
             Status|UNCONFIRMED                 |NEW
            Summary|wrong code at -O1 on        |[12 Regression] wrong code
                   |x86_64-linux-gnu            |at -O1 on x86_64-linux-gnu
                   |                            |since r12-3136

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r12-3136-g3673dcf6d6baeb67bb70ff03d4cb3f92beed0075

[Bug tree-optimization/102636] [12 Regression] wrong code at -O1 on x86_64-linux-gnu since r12-3136

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102636

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |102131

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I almost want to say this is a dup of bug 102131.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102131
[Bug 102131] [12 Regression] wrong code at -O1 and above on x86_64-linux-gnu
since r12-3136

[Bug tree-optimization/102636] [12 Regression] wrong code at -O1 on x86_64-linux-gnu since r12-3136

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102636

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

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

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
dup

*** This bug has been marked as a duplicate of bug 102131 ***

[Bug tree-optimization/102636] [12 Regression] wrong code at -O1 on x86_64-linux-gnu since r12-3136

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102636
Bug 102636 depends on bug 102131, which changed state.

Bug 102131 Summary: [12 Regression] wrong code at -O1 and above on x86_64-linux-gnu since r12-3136
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102131

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