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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/113186] [13/14 Regression] `(a^c) & (a^!c)`
 is not optimized to 0 for bool
Date: Thu, 04 Jan 2024 20:52:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113186

--- Comment #5 from GCC 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:97def769e6b28832f5ba4087d6fcdd44e18bf005

commit r14-6927-g97def769e6b28832f5ba4087d6fcdd44e18bf005
Author: Andrew Pinski <quic_apinski@quicinc.com>
Date:   Sun Dec 31 16:38:30 2023 -0800

    Match: Improve inverted_equal_p for bool and `^` and `=3D=3D` [PR113186]

    For boolean types, `a ^ b` is a valid form for `a !=3D b`. This means f=
or
    gimple_bitwise_inverted_equal_p, we catch some inverted value forms. Th=
is
    patch extends inverted_equal_p to allow matching of `^` with the
    corresponding `=3D=3D`. Note in the testcase provided we used to optimi=
ze
    in GCC 12 to just `return 0` where `a =3D=3D b` was used,
    this allows us to do that again.

    Bootstrapped and tested on x86_64-linux-gnu with no regressions.

            PR tree-optimization/113186

    gcc/ChangeLog:

            * gimple-match-head.cc (gimple_bitwise_inverted_equal_p):
            Match `^` with the `=3D=3D` for 1bit integral types.
            * match.pd (maybe_cmp): Allow for bit_xor for 1bit
            integral types.

    gcc/testsuite/ChangeLog:

            * gcc.dg/tree-ssa/bitops-bool-1.c: New test.

    Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>=