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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 tree-optimization/111444] New: Wrong code at -O2/3/s on
 x86_64-gnu since r14-3226-gd073e2d75d9
Date: Sun, 17 Sep 2023 13:09:17 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111444

            Bug ID: 111444
           Summary: Wrong code at -O2/3/s on x86_64-gnu since
                    r14-3226-gd073e2d75d9
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: shaohua.li at inf dot ethz.ch
                CC: mjambor at suse dot cz
  Target Milestone: ---

gcc at -O2/3/s produced the wrong code.

Bisected to r14-3226-gd073e2d75d9

Compiler explorer: https://godbolt.org/z/xWj9z8foe

$ cat a.c
int printf(const char *, ...);
int a =3D 3, d, e;
int *b =3D &a;
char c;
short f;
const int **g;
static long h(int **i, int **j) {
  const int *k[46];
  const int **l =3D &k[5];
  *j =3D &e;
  g =3D l;
  for (; d; d =3D d + 1)
    ;
  **i =3D 0;
  return f;
}
int main() {
  int *m =3D &a;
  h(&m, &m);
  c =3D *b;
  printf("%d\n", c);
}
$
$ gcc -O0 a.c && ./a.out
3
$ gcc -O2 a.c && ./a.out
0
$=