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* [Bug c/110251] New: Hang at -O3 on x86_64-linux-gnu
@ 2023-06-14 14:16 shaohua.li at inf dot ethz.ch
  2023-06-15  3:42 ` [Bug tree-optimization/110251] [14 Regression] " pinskia at gcc dot gnu.org
                   ` (18 more replies)
  0 siblings, 19 replies; 20+ messages in thread
From: shaohua.li at inf dot ethz.ch @ 2023-06-14 14:16 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110251

            Bug ID: 110251
           Summary: Hang at -O3 on x86_64-linux-gnu
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: shaohua.li at inf dot ethz.ch
  Target Milestone: ---

Since GCC-13, gcc -O3 would hang on the following testcase.

Compiler Explorer: https://godbolt.org/z/z6zTv889c

$ cat a.c
int a, b;
char c;
int d(int e) {
  if (e >= 'a')
    return e;
}
int f(unsigned short e) {
  for (; e; a++)
    e &= e - 1;
}
void g() {
  for (; c < 1;)
    ;
  for (; f(c - 1); b = d(c))
    ;
}
$
$ gcc-tk -O3 a.c 
Killed - processing time exceeded
$
$ gcc-tk -v
Using built-in specs.
COLLECT_GCC=gcc-tk
COLLECT_LTO_WRAPPER=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-bf470895905e9152424076d1630a9d2c60de023b/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --disable-multilib --disable-bootstrap
--enable-languages=c,c++
--prefix=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-bf470895905e9152424076d1630a9d2c60de023b
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230612 (experimental) (GCC) 
$

^ permalink raw reply	[flat|nested] 20+ messages in thread

end of thread, other threads:[~2024-05-21  9:15 UTC | newest]

Thread overview: 20+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-06-14 14:16 [Bug c/110251] New: Hang at -O3 on x86_64-linux-gnu shaohua.li at inf dot ethz.ch
2023-06-15  3:42 ` [Bug tree-optimization/110251] [14 Regression] " pinskia at gcc dot gnu.org
2023-06-15  4:32 ` pinskia at gcc dot gnu.org
2023-06-15  4:37 ` [Bug tree-optimization/110251] [13/14 " pinskia at gcc dot gnu.org
2023-06-15  6:20 ` rguenth at gcc dot gnu.org
2023-06-20 10:21 ` jakub at gcc dot gnu.org
2023-06-20 10:35 ` jakub at gcc dot gnu.org
2023-06-21 13:30 ` amacleod at redhat dot com
2023-06-26 14:04 ` amacleod at redhat dot com
2023-06-26 14:05 ` amacleod at redhat dot com
2023-07-27  9:26 ` rguenth at gcc dot gnu.org
2024-01-16 14:54 ` iamanonymous.cs at gmail dot com
2024-01-16 14:58 ` pinskia at gcc dot gnu.org
2024-01-16 15:05 ` amacleod at redhat dot com
2024-01-16 18:06 ` amacleod at redhat dot com
2024-01-16 18:11 ` jakub at gcc dot gnu.org
2024-01-16 18:27 ` amacleod at redhat dot com
2024-01-17  1:21 ` iamanonymous.cs at gmail dot com
2024-01-17 10:34 ` cvs-commit at gcc dot gnu.org
2024-05-21  9:15 ` [Bug tree-optimization/110251] [13 " jakub at gcc dot gnu.org

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