From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 2D9D038582A6; Thu, 13 Oct 2022 14:28:26 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2D9D038582A6
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1665671306;
	bh=xy08mPHI3md/M4ZIyt65a6gEyMnssTxkaPm/qTK4pxk=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=RWMdHPOP4zJHiLuF74t4yS4QKie8dhfZUXQpBYGXBJIJ+anNPE+5hxOceV+Pif7Cu
	 jbpnKHeHG5ZoxssR+jHA3NMtFW+mmQzczMZC1zX7yrPHYH0jQMJc/sFLj4GHkk15Ev
	 jSBHjC5l+P+PT9PNZT6XbGtfuKJIvOxio/RjWulM=
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107247] SLP reduction results fail to reduce
 to a single accumulator
Date: Thu, 13 Oct 2022 14:28:25 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-107247-4-XkZMIBRzVm@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-107247-4@http.gcc.gnu.org/bugzilla/>
References: <bug-107247-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107247

--- Comment #2 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:e5139d18dfb8130876ea59178e8471fb1b34bb80

commit r13-3276-ge5139d18dfb8130876ea59178e8471fb1b34bb80
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Oct 13 14:56:01 2022 +0200

    tree-optimization/107247 - reduce SLP reduction accumulator

    The following makes sure to reduce a multi-vector SLP reduction
    accumulator to a single vector using vector operations if
    easily possible (if the number of lanes in the vector type is
    a multiple of the number of scalar accumulators).

            PR tree-optimization/107247
            * tree-vect-loop.cc (vect_create_epilog_for_reduction):
            Reduce multi vector SLP reduction accumulators.  Check
            the adjusted number of accumulator vectors against
            one for the re-use in the epilogue.=