[Bug tree-optimization/110931] [14 Regression] Dead Code Elimination Regression since r14-2890-gcc2003cd875

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110931

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-08-07
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
```
void foo(void);
int l=1000;

int main(void)
{
  short t = l;
  unsigned t1 = t;
  if (t1 == 0) {
#if 1
    char b = t1;
#else
    char b = l;
#endif
    if (b != 1) __builtin_unreachable();
    foo();
  }
}
```

Changing 1 to 0 in the #if, shows the missed optimization too.