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 AAFAF385DC05; Tue, 11 Oct 2022 17:16:46 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org AAFAF385DC05
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1665508608;
	bh=WcFlO9Uy/EWsXSVphmjTHTCVhGY5qeg3cGqAj1VcoLs=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=kMTm19DNx79gB3GXpUY/pqmE84POedFqktApv1HsT5PztfAKvKKeIk4hbYVSz8/SJ
	 07q86BZl9FQ2CplyMxWR6ATZDC1vW7KoDB0oeBDTHt6KDe+7ht880QEntg3W0oLJom
	 H3VsjYxeLFIkS75Ty8xIiQvRN749v+eA31E4/7Dw=
From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107172] [13 Regression] wrong code with "-O1 -ftree-vrp"
 on x86_64-linux-gnu since r13-1268-g8c99e307b20c502e
Date: Tue, 11 Oct 2022 17:16:45 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: hjl.tools at gmail dot com
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P1
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 13.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-107172-4-nD1pycKxpL@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-107172-4@http.gcc.gnu.org/bugzilla/>
References: <bug-107172-4@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=3D107172

--- Comment #13 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Segher Boessenkool from comment #12)
>=20
> To determine the semantics of this piece of RTL you need to see the sette=
r(s)
> of reg 17 feeding this use.  In this case, the setter was
>   (set (reg:CCC 17)
>        (ne:CCC (reg:SI 82)
>                (const_int 0 [0])))
> which has no meaning for a use that uses "ltu".

What should a valid setter look like?  It should set reg 17 in CCC mode if
reg 82 in SI mode isn't 0.=