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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111917] [11/12/13/14 Regression] ICE in as_a,
 at is-a.h:255 since GCC-7
Date: Sun, 22 Oct 2023 23:16:52 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: ice-on-valid-code, needs-bisection
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
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X-Bugzilla-Target-Milestone: 11.5
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Message-ID: <bug-111917-4-lShGBf5klG@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111917

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
If someone is worried about uninitialized variables or an executed infinite
loop, this also ICEs at -O3:
```
long t;
long a() {
  long b =3D t, c =3D t;
  for (; b < 31; b++)
    c <<=3D 1;
  return c;
}
long long t1;
static=20
int d() {
  if (!t1)
    return 0;
e:
f:
  for (; a();)
    ;
  goto f;
  return 0;
}
int main() { d(); }
```=