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 C7D3F3857BB3; Mon, 24 Oct 2022 12:56:13 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C7D3F3857BB3
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1666616173;
	bh=uPKCEaqQ8FKpXvVvEy0AYlT5xq1D5deAiacNz1DVsnk=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=tAMx0aol8MqOHBnofjf5ebD30plopXfFPOg4naeBiMQlr4DMaU0tT2G31A+gq8YlO
	 8orWpmbh7HuzIyE3qPO3n9+WfLabxbsxOPpRv4Zu1FxIUknPmmGNLibzUR8eu8B/db
	 ej3hHEuvKBORyAMdNSq05/iqDlpBVGYohIYimnhI=
From: "clyon at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/102516] [12/13 regression] pr65947-13.c and
 vect-alias-check-18.c fail on armeb since r12-3893
Date: Mon, 24 Oct 2022 12:56:12 +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: 12.0
X-Bugzilla-Keywords: testsuite-fail
X-Bugzilla-Severity: normal
X-Bugzilla-Who: clyon at gcc dot gnu.org
X-Bugzilla-Status: WAITING
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 12.3
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-102516-4-Lmd8JG0AFX@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-102516-4@http.gcc.gnu.org/bugzilla/>
References: <bug-102516-4@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=3D102516

--- Comment #9 from Christophe Lyon <clyon at gcc dot gnu.org> ---
Indeed it works again on trunk, I bisected and it started with one of our
commits: r12-3958-g4c7731081647c22cbd249dc0faa20c3df9ed6411
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Sep 29 11:18:23 2021 +0200

    Fix peeling for alignment with negative step

    The following fixes a regression causing us to no longer peel
    negative step loops for alignment.  With dr_misalignment now
    applying the bias for negative step we have to do the reverse
    when adjusting the misalignment for peeled DRs.

    2021-09-29  Richard Biener  <rguenther@suse.de>

            * tree-vect-data-refs.c (vect_dr_misalign_for_aligned_access):
            New helper.
            (vect_update_misalignment_for_peel): Use it to update
            misaligned to the value necessary for an aligned access.
            (vect_get_peeling_costs_all_drs): Likewise.
            (vect_enhance_data_refs_alignment): Likewise.

            * gcc.target/i386/vect-alignment-peeling-1.c: New testcase.
            * gcc.target/i386/vect-alignment-peeling-2.c: Likewise.


We still have
FAIL: gcc.dg/vect/pr65947-13.c scan-tree-dump-times vect "condition express=
ion
based on integer induction." 2
but based on the original report, this was already present=