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* [Bug c/110243] New: Wrong code at -O3 on x86_64-linux-gnu
@ 2023-06-13 21:10 shaohua.li at inf dot ethz.ch
  2023-06-13 21:26 ` [Bug tree-optimization/110243] [13/14 Regression] " pinskia at gcc dot gnu.org
                   ` (16 more replies)
  0 siblings, 17 replies; 18+ messages in thread
From: shaohua.li at inf dot ethz.ch @ 2023-06-13 21:10 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110243

            Bug ID: 110243
           Summary: Wrong code 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 at -O3 produces wrong code.

Compiler explorer: https://godbolt.org/z/jnroxhddY

$ cat a.c
#define X 1100000000
char a;
long b = X;
int c[9][1];
unsigned d;
static long *e = &b, *f = &b;
int g() {
  if (a && a <= '9')
    return '0';
  if (a)
    return 10;
  return -1;
}
int main() {
  d = 0;
  for (; (int)*f -(X-1) + d < 9; d++)
    c[g() + (int)*f + ((int)*e - X) -(X-1) + d]
     [0] = 0;
}
$
$ gcc-tk -O3 a.c &&./a.out
Segmentation fault
$
$ gcc-tk -O0 a.c &&./a.out
$
$ gcc-tk -fsanitize=address,undefined a.c &&./a.out
$
$ 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] 18+ messages in thread
end of thread, other threads:[~2024-02-06 13:21 UTC | newest]

Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-06-13 21:10 [Bug c/110243] New: Wrong code at -O3 on x86_64-linux-gnu shaohua.li at inf dot ethz.ch
2023-06-13 21:26 ` [Bug tree-optimization/110243] [13/14 Regression] " pinskia at gcc dot gnu.org
2023-06-14 12:13 ` rguenth at gcc dot gnu.org
2023-06-16 11:32 ` rguenth at gcc dot gnu.org
2023-06-16 11:43 ` rguenth at gcc dot gnu.org
2023-06-21 13:50 ` rguenth at gcc dot gnu.org
2023-07-27  9:26 ` rguenth at gcc dot gnu.org
2023-07-30 14:35 ` shaohua.li at inf dot ethz.ch
2023-07-31  7:14 ` rguenth at gcc dot gnu.org
2023-10-17 14:35 ` [Bug tree-optimization/110243] [13/14 Regression] Wrong code at -O3 on x86_64-linux-gnu since r13-3875-g9e11ceef165 rguenth at gcc dot gnu.org
2023-10-20 13:15 ` cvs-commit at gcc dot gnu.org
2023-10-20 13:16 ` [Bug tree-optimization/110243] [13 " rguenth at gcc dot gnu.org
2023-10-20 13:50 ` rguenth at gcc dot gnu.org
2023-10-20 13:54 ` cvs-commit at gcc dot gnu.org
2023-10-20 13:55 ` [Bug tree-optimization/110243] [12/13 " rguenth at gcc dot gnu.org
2023-10-20 13:57 ` rguenth at gcc dot gnu.org
2023-10-20 13:58 ` rguenth at gcc dot gnu.org
2024-02-06 13:21 ` rguenth at gcc dot gnu.org

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