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From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111792] New: wrong code at -O3 on
 x86_64-linux-gnu
Date: Fri, 13 Oct 2023 06:28:28 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111792

            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=3Dgcctk
COLLECT_LTO_WRAPPER=3D/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=3Dyes --prefix=3D/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=3Dc,c++ --disable-werror --enable-mu=
ltilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20231013 (experimental) (GCC)=20
[538] %=20
[538] % gcctk -O2 small.c; ./a.out
[539] %=20
[539] % gcctk -O3 small.c
[540] % ./a.out
Aborted
[541] % cat small.c
int c, d, h, i, j, l, *n =3D &h;
short e, f, g, *k, m;
long o;
short p(short p1, int q) { return q >=3D 32 || p1 > 5 >> q ? 1 : p1 << q; }
long u(unsigned p1) {
  int r =3D 50, s, *t =3D &c;
 L:
  m && (*k =3D 0);
  for (d =3D 1; d; d--)
    for (s =3D 0; s < 3; s++) {
      *n =3D i ^ p1;
      *t =3D p1 > (unsigned)p((unsigned)(o =3D 4073709551615) >=3D p1 && 5,=
 r);
      if (f)
        goto L;
    }
  for (; e < 1;)
    return j;
  int *b[2] =3D {&s, &r};
  for (; l; l--) {
    long a[1];
    for (r =3D 0; r < 1; r++) {
      h =3D a[0];
      if (g)
        goto L;
    }
  }
  return 0;
}
int main() {
  u(6);
  if (c !=3D 1)
    __builtin_abort();
  return 0;
}=