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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/111000] New: Wrong code at -O3 on x86_64-linux-gnu since
 r14-2944-g3d48c11ad08
Date: Sat, 12 Aug 2023 07:02:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111000

            Bug ID: 111000
           Summary: Wrong code at -O3 on x86_64-linux-gnu since
                    r14-2944-g3d48c11ad08
           Product: gcc
           Version: 14.0
            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 at -O3 produces the wrong code.

Bisected to r14-2944-g3d48c11ad08

Compiler explorer: https://godbolt.org/z/b67W17Gvb

$ cat a.c
int printf(const char *, ...);
long a =3D 68;
int b, d, e;
int main() {
  for (; d <=3D 6; d++) {
    b =3D 0;
    for (; b <=3D 6; b++) {
      int c =3D a;
      e =3D c >=3D 32 || d > 647 >> c ? d : 0;
    }
  }
  printf("%d\n", e);
}
$
$ gcc -O0 a.c &&./a.out
6
$ gcc -O3 a.c && ./a.out
4
$=