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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/111282] `a & (b ^ ~a)` (or `a & ~(a ^ b)`)
 not optimized to `a & b` in gimple
Date: Wed, 11 Oct 2023 16:46:51 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111282

--- Comment #6 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:e8d418df3dc609f27487deece796d4aa69004b8c

commit r14-4561-ge8d418df3dc609f27487deece796d4aa69004b8c
Author: Andrew Pinski <pinskia@gmail.com>
Date:   Tue Oct 10 12:45:56 2023 -0700

    MATCH: [PR111282] Simplify `a & (b ^ ~a)` to `a & b`

    While `a & (b ^ ~a)` is optimized to `a & b` on the rtl level,
    it is always good to optimize this at the gimple level and allows
    us to match a few extra things including where a is a comparison.

    Note I had to update/change the testcase and-1.c to avoid matching
    this case as we can match -2 and 1 as bitwise inversions.

            PR tree-optimization/111282

    gcc/ChangeLog:

            * match.pd (`a & ~(a ^ b)`, `a & (a =3D=3D b)`,
            `a & ((~a) ^ b)`): New patterns.

    gcc/testsuite/ChangeLog:

            * gcc.dg/tree-ssa/and-1.c: Update testcase to avoid
            matching `~1 & (a ^ 1)` simplification.
            * gcc.dg/tree-ssa/bitops-6.c: New test.=