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From: "tkoenig 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: Mon, 23 Oct 2023 06:08:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111917

--- Comment #4 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #3)
> If someone is worried about uninitialized variables or an executed infini=
te
> 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(); }
> ```

It does not ICE with aa90195, for which the original test case ICEs,
so it is something else (although probably related).=