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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/100810] [12 Regression] wrong code at -O1 and above
 on x86_64-linux-gnu since r12-397-gda9e6e63d1ae22e530ec7baf59f6ed028bf05776
Date: Mon, 04 Apr 2022 13:00:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100810

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testcase from PR102902, since it runtime times-out difficult to adapt to the
testsuite bug fixed by both proposed patches.

[576] % gcctk -O2 small.c; ./a.out
[577] %=20
[577] % gcctk -O3 small.c
[578] % timeout -s 9 10 ./a.out
Killed
[579] %=20
[579] % cat small.c
int printf (const char *, ...);
int a, b, c, d, e, f;
int main() {
  int g;
  short h =3D 1;
  for (; e < 2; e++) {
  L1:
    f =3D 1;
    while (b > 0 || a > 0) {
      g++;
      h++;
      printf("%d", g);
    }
  L2:
    if (!h && (!c || a))
      goto L1;
    if (c)
      goto L2;
  }
  return 0;
}=