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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/114027] [11/12/13/14 Regression] miscompile
 at `-O3 -fno-vect-cost-model -msse4.2`
Date: Thu, 22 Feb 2024 12:14:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114027

--- Comment #15 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:549f251f055e3a0b0084189a3012c4f15d635e75

commit r14-9134-g549f251f055e3a0b0084189a3012c4f15d635e75
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Feb 22 10:50:12 2024 +0100

    tree-optimization/114027 - conditional reduction chain

    When we classify a conditional reduction chain as CONST_COND_REDUCTION
    we fail to verify all involved conditionals have the same constant.
    That's a quite unlikely situation so the following simply disables
    such classification when there's more than one reduction statement.

            PR tree-optimization/114027
            * tree-vect-loop.cc (vecctorizable_reduction): Use optimized
            condition reduction classification only for single-element
            chains.

            * gcc.dg/vect/pr114027.c: New testcase.=