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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/100864] (a&!b) | b is not opimized to a | b
 for comparisons
Date: Mon, 31 Jul 2023 17:12:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100864

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Andrew Pinski <pinskia@gcc.gnu.org>:

https://gcc.gnu.org/g:b9237226fdc9387bccf584a811b30c5d3689ffd2

commit r14-2885-gb9237226fdc9387bccf584a811b30c5d3689ffd2
Author: Andrew Pinski <apinski@marvell.com>
Date:   Fri Jul 28 20:27:03 2023 -0700

    tree-optimization: [PR100864] `(a&!b) | b` is not opimized to `a | b` f=
or
comparisons

    This is a new version of the patch.
    Instead of doing the matching of inversion comparison directly inside
    match, creating a new function (bitwise_inverted_equal_p) to do it.
    It is very similar to bitwise_equal_p that was added in
r14-2751-g2a3556376c69a1fb
    but instead it says `expr1 =3D=3D ~expr2`. A follow on patch, will
    use this function in other patterns where we try to match `@0` and
`(bit_not @0)`.

    Changed the name bitwise_not_equal_p to bitwise_inverted_equal_p.

    Committed as approved after a Bootstrapped and test on x86_64-linux-gnu
with no regressions.

            PR tree-optimization/100864

    gcc/ChangeLog:

            * generic-match-head.cc (bitwise_inverted_equal_p): New functio=
n.
            * gimple-match-head.cc (bitwise_inverted_equal_p): New macro.
            (gimple_bitwise_inverted_equal_p): New function.
            * match.pd ((~x | y) & x): Use bitwise_inverted_equal_p
            instead of direct matching bit_not.

    gcc/testsuite/ChangeLog:

            * gcc.dg/tree-ssa/bitops-3.c: New test.=