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* [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu
@ 2023-10-13  6:28 zhendong.su at inf dot ethz.ch
  2023-10-13  6:59 ` [Bug tree-optimization/111792] [14 Regression] " rguenth at gcc dot gnu.org
                   ` (7 more replies)
  0 siblings, 8 replies; 9+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2023-10-13  6:28 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111792

            Bug ID: 111792
           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.

compiler Explorer: https://godbolt.org/z/7vfzPYTrn

[537] % 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/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20231013 (experimental) (GCC) 
[538] % 
[538] % gcctk -O2 small.c; ./a.out
[539] % 
[539] % gcctk -O3 small.c
[540] % ./a.out
Aborted
[541] % cat small.c
int c, d, h, i, j, l, *n = &h;
short e, f, g, *k, m;
long o;
short p(short p1, int q) { return q >= 32 || p1 > 5 >> q ? 1 : p1 << q; }
long u(unsigned p1) {
  int r = 50, s, *t = &c;
 L:
  m && (*k = 0);
  for (d = 1; d; d--)
    for (s = 0; s < 3; s++) {
      *n = i ^ p1;
      *t = p1 > (unsigned)p((unsigned)(o = 4073709551615) >= p1 && 5, r);
      if (f)
        goto L;
    }
  for (; e < 1;)
    return j;
  int *b[2] = {&s, &r};
  for (; l; l--) {
    long a[1];
    for (r = 0; r < 1; r++) {
      h = a[0];
      if (g)
        goto L;
    }
  }
  return 0;
}
int main() {
  u(6);
  if (c != 1)
    __builtin_abort();
  return 0;
}

^ permalink raw reply	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2023-11-13 12:41 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-10-13  6:28 [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-10-13  6:59 ` [Bug tree-optimization/111792] [14 Regression] " rguenth at gcc dot gnu.org
2023-10-17 13:14 ` rguenth at gcc dot gnu.org
2023-10-17 13:59 ` [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-3414-g0cfc9c953d0221 ppalka at gcc dot gnu.org
2023-11-05 22:24 ` pinskia at gcc dot gnu.org
2023-11-10 16:23 ` jakub at gcc dot gnu.org
2023-11-13  9:42 ` rguenth at gcc dot gnu.org
2023-11-13 12:40 ` cvs-commit at gcc dot gnu.org
2023-11-13 12:41 ` rguenth at gcc dot gnu.org

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