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 83A31385828C; Tue, 18 Oct 2022 00:19:43 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 83A31385828C
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1666052383;
	bh=rDdgV2D2dTnma4wTL3gVubzzYCUkdoY/y6x78owv0fA=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=FFf4OkYlgTpkmn8vP8ZDd4nf0UpsECF2ENDXeyrdkFK8dMDFqF+n57mfI0WTVPKSb
	 xtpSpXiepHTStjDuI3xTtITnDWtuguxleZA1MWSzaCcZY6zr9jTsTeZ/5ggI/sc/cv
	 QO09CI+MS7iRN6MzoB4xU81eNmCw/bnOaCHQXteA=
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, 18 Oct 2022 00:19:41 +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-PuCU4Hhn7S@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 #39 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Segher Boessenkool from comment #38)
> You cannot put a const_int in a MODE_CC.  It is meaningless.

Reg 17 in

(insn 49 10 50 2 (parallel [
            (set (reg:CCC 17 flags)
                (ne:CCC (reg:SI 82 [ a.1_2 ])
                    (const_int 0 [0])))
            (set (reg:SI 92)
                (neg:SI (reg:SI 82 [ a.1_2 ])))
        ]) "107172.c":4:10 680 {*negsi_ccc_1}

becomes const_int 1 since a.1_2 is known non-zero.  Roger's patch simplifies
const_int in a MODE_CC properly.=