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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/110931] [14 Regression] Dead Code Elimination
 Regression since r14-2890-gcc2003cd875
Date: Mon, 07 Aug 2023 15:11:58 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110931

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=3D1000;

int main(void)
{
  short t =3D l;
  unsigned t1 =3D t;
  if (t1 =3D=3D 0) {
#if 1
    char b =3D t1;
#else
    char b =3D l;
#endif
    if (b !=3D 1) __builtin_unreachable();
    foo();
  }
}
```

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