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Subject: [Bug tree-optimization/103237] [10/11/12 Regression] wrong code with
 -ftree-vectorize at -O1 on x86_64-linux-gnu starting with
 r7-1219-gb28ead45fe630b9e
Date: Mon, 15 Nov 2021 12:08:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103237

--- Comment #8 from CVS 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:220bd61874cf114667b44f9ded76ed0639eb278b

commit r12-5266-g220bd61874cf114667b44f9ded76ed0639eb278b
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Nov 15 11:37:56 2021 +0100

    tree-optimization/103237 - avoid vectorizing unhandled double reductions

    Double reductions which have multiple LC PHIs in the inner loop
    are not handled correctly during transformation since those PHIs
    are not properly classified as reduction.  The following disables
    vectorizing them.

    2021-11-15  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/103237
            * tree-vect-loop.c (vect_is_simple_reduction): Fail for
            double reductions with multiple inner loop LC PHI nodes.

            * gcc.dg/torture/pr103237.c: New testcase.=