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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/114027] [11/12 Regression] miscompile at `-O3
 -fno-vect-cost-model -msse4.2`
Date: Thu, 16 May 2024 09:56:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114027

--- Comment #21 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:6661a7c098a46eff4afc98b55c89e3a71d63d674

commit r12-10450-g6661a7c098a46eff4afc98b55c89e3a71d63d674
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.

    (cherry picked from commit 549f251f055e3a0b0084189a3012c4f15d635e75)=