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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/114551] New: wrong code at -O3 on
 x86_64-linux-gnu
Date: Mon, 01 Apr 2024 19:31:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114551

            Bug ID: 114551
           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 as it does not reproduce for 13.2 and
earlier.=20

Compiler Explorer: https://godbolt.org/z/q3hrz8MW1

[587] % 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/14.0.1/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 14.0.1 20240401 (experimental) (GCC)=20
[588] %=20
[588] % gcctk -O2 small.c; ./a.out
[589] %=20
[589] % gcctk -O3 small.c
[590] % ./a.out
Segmentation fault
[591] %=20
[591] % cat small.c
int a, b[4], c, d, e, f;
int main() {
  a--;
  for (f =3D 3; f >=3D 0; f--) {
    for (e =3D 0; e < 4; e++)
      c =3D 0;
    for (; c < 4; c++) {
      d =3D f && a > 0 && f > (2147483647 - a) ? 0 : b[f];
      continue;
    }
  }
  return 0;
}=