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* [Bug tree-optimization/100740] New: wrong code at -O1 and above on x86_64-linux-gnu
@ 2021-05-24 11:10 zhendong.su at inf dot ethz.ch
  2021-05-24 11:25 ` [Bug tree-optimization/100740] [9/10/11/12 Regression] wrong code at -O1 and above on x86_64-linux-gnu since r9-4145 jakub at gcc dot gnu.org
                   ` (15 more replies)
  0 siblings, 16 replies; 17+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2021-05-24 11:10 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100740

            Bug ID: 100740
           Summary: wrong code at -O1 and above 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: ---

This seems to be quite long-latent, impacting GCC 9.1 and later. 

[636] % 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 20210524 (experimental) [master revision
dc084c487e9:bd7ae6b8ef8:9d38e096c5e3b1c2233b28d0e6ff8ee81517af56] (GCC) 
[637] % 
[637] % gcctk -O0 small.c; ./a.out
[638] % 
[638] % gcctk -O1 small.c
[639] % ./a.out
Aborted
[640] % 
[640] % cat small.c
unsigned a, b;
int main() {
  unsigned c = 0;
  for (a = 0; a < 2; a++)
    for (b = 0; b < 2; b++)
      if (++c < a)
        __builtin_abort ();
  return 0;
}

^ permalink raw reply	[flat|nested] 17+ messages in thread
end of thread, other threads:[~2023-07-07 10:40 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-24 11:10 [Bug tree-optimization/100740] New: wrong code at -O1 and above on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2021-05-24 11:25 ` [Bug tree-optimization/100740] [9/10/11/12 Regression] wrong code at -O1 and above on x86_64-linux-gnu since r9-4145 jakub at gcc dot gnu.org
2021-05-24 11:58 ` amker at gcc dot gnu.org
2021-06-01  8:20 ` rguenth at gcc dot gnu.org
2021-07-27 23:13 ` pinskia at gcc dot gnu.org
2021-09-17 10:01 ` marxin at gcc dot gnu.org
2021-10-09 17:28 ` pinskia at gcc dot gnu.org
2021-10-19  8:38 ` marxin at gcc dot gnu.org
2021-11-17 21:20 ` [Bug tree-optimization/100740] [9/10/11/12 Regression] wrong code at -O1 and above on x86_64-linux-gnu since r9-4145-ga81e2c6240655f60 pinskia at gcc dot gnu.org
2022-01-24 12:15 ` cvs-commit at gcc dot gnu.org
2022-01-24 12:46 ` [Bug tree-optimization/100740] [9/10/11 " rguenth at gcc dot gnu.org
2022-01-24 12:46 ` rguenth at gcc dot gnu.org
2022-01-26 13:12 ` rguenth at gcc dot gnu.org
2022-04-07  9:46 ` rguenth at gcc dot gnu.org
2022-05-27  9:45 ` [Bug tree-optimization/100740] [10/11 " rguenth at gcc dot gnu.org
2022-06-28 10:45 ` jakub at gcc dot gnu.org
2023-07-07 10:40 ` [Bug tree-optimization/100740] [11 " rguenth at gcc dot gnu.org

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