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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/107541] New: wrong code at -O1, -O2 and -O3
 on x86_64-linux-gnu
Date: Sun, 06 Nov 2022 12:56:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107541

            Bug ID: 107541
           Summary: wrong code at -O1, -O2 and -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: ---

This appears to be a recent regression; 12.2 compiles it correctly.=20

Compiler Explorer: https://godbolt.org/z/6nq8jxn57

[661] % 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/13.0.0/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
--with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221104 (experimental) [master r13-3701-g07b0096e5b6] (=
GCC)=20
[662] %=20
[662] % gcctk -O0 small.c; ./a.out
[663] %=20
[663] % gcctk -O1 small.c
[664] % ./a.out
Aborted
[665] %=20
[665] % cat small.c
unsigned char a =3D 1;
char b, e;
long c;
short d;
int main() {
  a =3D ~(1 && a);
  c =3D ~((~a / 8 | -2) & 11007578330939886389LLU);
  e =3D -c;
  d =3D ~c / e;
  if (d < 2000)
    __builtin_abort();
  return 0;
}=