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From: "shaohua.li at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/106892] New: Wrong code at -O3 on x86_64-linux-gnu
Date: Thu, 08 Sep 2022 21:37:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106892

            Bug ID: 106892
           Summary: Wrong code at -O3 on x86_64-linux-gnu
           Product: gcc
           Version: 13.0
            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: ---

$ gcc-tk -v
Using built-in specs.
COLLECT_GCC=3Dgcc-tk
COLLECT_LTO_WRAPPER=3D/zdata/shaoli/compilers/ccbuilder-compilers/gcc-75f59=
441cd63a1d07e86d70d59c518049f53904f/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/=
lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --disable-multilib --disable-bootstrap
--enable-languages=3Dc,c++
--prefix=3D/zdata/shaoli/compilers/ccbuilder-compilers/gcc-75f59441cd63a1d0=
7e86d70d59c518049f53904f
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20220830 (experimental) (GCC)
$
$ gcc-tk -w -O0 simple.c && ./a.out
0
$ gcc-tk -w -O0 simple.c && ./a.out
3
$=20
$ cat simple.c
a, b, c, d, e;
f[8];
g() {
  while (a)
    a >>=3D 4;
}
h(i) {
  if (i >=3D '0')
    return i - '0';
}
j(i) {
  b =3D 2;
  for (; g() <=3D 7; b++)
    if (i) {
      for (; e <=3D 7; e++) {
        c =3D 1;
        for (; c <=3D 7; c++) {
          d =3D h(b + 48);
          f[-d + 4] ^=3D 3;
        }
      }
      return;
    }
}
main() {
  j(1);
  printf("%d\n", f[2]);
}
$=