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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/112310] New: [14 Regression] Wrong code at
 -O2/3 on x86_64-linux-gnu since r14-1161-g5476de2618f
Date: Tue, 31 Oct 2023 11:13:33 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112310

            Bug ID: 112310
           Summary: [14 Regression] Wrong code at -O2/3 on
                    x86_64-linux-gnu since r14-1161-g5476de2618f
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: shaohua.li at inf dot ethz.ch
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---

gcc at -O2/3 produces the wrong code.

Bisected to r14-1161-g5476de2618f

Compiler explorer: https://godbolt.org/z/Kb4qMKE9K

$ cat a.c
int printf(const char *, ...);
short a, b;
static int c, d, e, f =3D -7;
char g;
int *h =3D &d;
int **i =3D &h;
int j;
short(k)(int l) { return l >=3D 2 ? 0 : l; }
int(m)(int l, int n) { return l < -2147483647 / n ? l : l * n; }
void o() { &c; }
int main() {
  {
    int p;
    for (; g <=3D 3; g++) {
      for (; c; c++)
        ;
      a =3D 2;
      for (; a <=3D 7; a++) {
        short *r =3D &b;
        p =3D m(*h, 2022160547);
        unsigned q =3D 2022160547;
        e =3D p * q;
        *r ^=3D e;
        j =3D k(c + 3);
        **i =3D 0;
      }
      *i =3D &f;
    }
  }
  printf("%d\n", b);
}
$
$ gcc -O0 a.c && ./a.out
-3189
$ gcc -O2 a.c && ./a.out
0
$=