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 9099D3858C2F; Mon, 30 Oct 2023 14:21:11 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9099D3858C2F
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1698675671;
	bh=ujiKSgbB5466Ha/YeP/Qzuvh+nf5sUty9vVDjRdyqvA=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=qD81Lw/h73YfzuHMfOXPAlgYlHl6I2XnIFRGkUXxfezf8fEin+r5IiA3jIoPxQGh5
	 Geg3M2A8SLJytC/9Tg2mDEp2qJ3AfwSjltLuwglCZOc8c59626RCOQISzUfH9tu8vt
	 FDFnRznAE+ovWftDZaSv+zdw7Qm+Az7ZJ4rIlFTw=
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/112281] [12/13/14 Regression] wrong code at
 -O3 on x86_64-linux-gnu since r12-2097-g9f34b780b0461e
Date: Mon, 30 Oct 2023 14:21:11 +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: 13.2.1
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 12.4
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: version priority assigned_to bug_status
Message-ID: <bug-112281-4-SM92bHk0BC@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-112281-4@http.gcc.gnu.org/bugzilla/>
References: <bug-112281-4@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=3D112281

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unknown                     |13.2.1
           Priority|P3                          |P2
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot =
gnu.org
             Status|NEW                         |ASSIGNED

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Possibly a mixup of dependence direction somewhere.  If c would not iterate
backwards the transform would be correct.

We compute

(build_classic_dist_vector
  dist_vector =3D (1 0
  )

and then possibly get partition order wrong.  With 11 we had fixes there,
possibly this broke it.

I will have a look.  At some point ...=