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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/95906] Failure to recognize max pattern with
 mask
Date: Wed, 23 Aug 2023 05:18:49 +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: 11.0
X-Bugzilla-Keywords: easyhack, missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95906

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  cmp_8 =3D -_2;
  _3 =3D cmp_8 & a_6(D);
We convert that into:
_2 * a_6(D);

And then have:
  _11 =3D _2 + -1;
  _5 =3D b_7(D) & _11;

This could be convert into:
(_11 ^ 1) * b_7(D)

```
(simplify
 (bit_and:c (convert? (plus zero_one_valued_p@0 integer_all_onesp)) @1)
 (if (INTEGRAL_TYPE_P (type)
      && INTEGRAL_TYPE_P (TREE_TYPE (@0))
      && TREE_CODE (TREE_TYPE (@0)) !=3D BOOLEAN_TYPE
      /* Sign extending of the neg or a truncation of the neg
         is needed. */
      && (!TYPE_UNSIGNED (TREE_TYPE (@0))
          || TYPE_PRECISION (type) <=3D TYPE_PRECISION (TREE_TYPE (@0))))
 (mult (convert (bit_xor @0 { build_one_cst (TREE_TYPE (@0)); })) @1))
```=