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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/110539] [14 Regression] Dead Code Elimination
 Regression at since r14-338-g1dd154f6407
Date: Thu, 06 Jul 2023 21:45:18 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110539

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is a testcase for the missing optimization (at -O1) which is optimized=
 at
the RTL level (for some targets but not all):
```
int f(int a)
{
        int b =3D a & 1;
        int c =3D b !=3D 0;
        return c =3D=3D b;
}
```

Though it does optimize at -O2 because VRP changes: `b !=3D 0` into `(_Bool)
b_4`.=