https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110251
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like it is uninitialized variable related.
Here is one which shows that:
```
int a, b;
char c;
int d(int e) {
int t = 0;
if (e >= 'a')
return e;
return t;
}
int f(unsigned short e) {
int t2;
for (; e; a++)
e &= e - 1;
return t2;
}
void g() {
for (; c < 1;)
;
for (; f(c - 1); b = d(c))
;
}
```
If you initialize t2 to either 1 or 0, GCC will not hang.
