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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/111764] [11 Regression] Wrong code at -O3 on
 x86_64-linux-gnu
Date: Fri, 15 Dec 2023 12:18:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111764

--- Comment #11 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:7473b2742aa1637d14a64505e855aa09452536b1

commit r11-11143-g7473b2742aa1637d14a64505e855aa09452536b1
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Oct 12 09:09:46 2023 +0200

    tree-optimization/111764 - wrong reduction vectorization

    The following removes a misguided attempt to allow x + x in a reduction
    path, also allowing x * x which isn't valid.  x + x actually never
    arrives this way but instead is canonicalized to 2 * x.  This makes
    reduction path handling consistent with how we handle the single-stmt
    reduction case.

            PR tree-optimization/111764
            * tree-vect-loop.c (check_reduction_path): Remove the attempt
            to allow x + x via special-casing of assigns.

            * gcc.dg/vect/pr111764.c: New testcase.

    (cherry picked from commit 05f98310b54da95e468d799f4a910174320cccbb)=