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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/111679] `(~a) | (a ^ b)` is not simplified to
 `~(a & b)`
Date: Thu, 05 Oct 2023 04:15:00 +0000
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X-Bugzilla-Product: gcc
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=3D111679

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
/* (~a) | (a ^ b)  -->  (~a) | (~b)
   (which might be done into ~(a & b) depending on if ~a is not a cmp)  */
(simplify
 (bit_ior:c @0 (bit_xor:c @1 @2))
 (with { bool wascmp; }
 (if (bitwise_inverted_equal_p (@0, @1, wascmp)
      && (!wascmp || element_precision (type) =3D=3D 1))
  (bit_ior @0 (bit_not @2)))))
```

Still need some testcases.=