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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/115395] [15 regression] libarchive
 miscompiled with -O2 -march=znver2 -fno-vect-cost-model since
 r15-1006-gd93353e6423eca
Date: Mon, 10 Jun 2024 09:39:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115395

--- Comment #7 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:4ed9c5df7efeb98e190573cca42a4fd40666c45f

commit r15-1160-g4ed9c5df7efeb98e190573cca42a4fd40666c45f
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Jun 10 10:12:52 2024 +0200

    tree-optimization/115395 - wrong-code with SLP reduction in epilog

    When we continue a non-SLP reduction from the main loop in the
    epilog with a SLP reduction we currently fail to handle an
    adjustment by the initial value because that's not a thing with SLP.
    As long as we have the possibility to mix SLP and non-SLP we have
    to handle it though.

            PR tree-optimization/115395
            * tree-vect-loop.cc (vect_create_epilog_for_reduction):
            Handle STMT_VINFO_REDUC_EPILOGUE_ADJUSTMENT also for SLP
            reductions of group_size one.

            * gcc.dg/vect/pr115395.c: New testcase.=