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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/19832] don't remove an if when we know the
 value is the same as with the if (subtraction)
Date: Mon, 25 Dec 2023 04:02:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D19832

--- Comment #14 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:59ecd5ff096f800de17b804f1482055f2d84d629

commit r14-6827-g59ecd5ff096f800de17b804f1482055f2d84d629
Author: Andrew Pinski <quic_apinski@quicinc.com>
Date:   Sun Dec 24 15:51:35 2023 -0800

    match: Improve `(a !=3D b) ? (a + b) : (2 * a)` pattern [PR19832]

    In the testcase provided, we would match f_plus but not g_plus
    due to a missing `:c` on the plus operator. This fixes the oversight
    there.

    Note this was noted in https://github.com/llvm/llvm-project/issues/7631=
8 .

    Committed as obvious after bootstrap/test on x86_64-linux-gnu.

            PR tree-optimization/19832

    gcc/ChangeLog:

            * match.pd (`(a !=3D b) ? (a + b) : (2 * a)`): Add `:c`
            on the plus operator.

    gcc/testsuite/ChangeLog:

            * gcc.dg/tree-ssa/phi-opt-same-2.c: New test.

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