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 7E7313858D28; Fri, 27 Jan 2023 22:56:39 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7E7313858D28
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1674860199;
	bh=6Dkl1MCvrM7YbNW1PSeA7EiJAiAzpHWw1B91+1GuDJY=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=ZSauT0atDQOVNn7ZEiH2LL8xEi40kWuk8x9Pg1PnzII1/kbdHhj51+HI17iULrZtC
	 a/2e5pTINYYTYumNWN+C4nQMP4pql2jD26U7W6x9LsDoJxrzot27tbhXhOb90xkLr3
	 pt+YEfPM2a8C8RrGz9aQqILKqcqM7hfXX9DGxrOc=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/108574] [13 Regression] wrong code at -Os and
 above on x86_64-linux-gnu
Date: Fri, 27 Jan 2023 22:56:39 +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: unknown
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 13.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: everconfirmed short_desc target_milestone keywords
 cf_reconfirmed_on bug_status
Message-ID: <bug-108574-4-IbDSY3QIWJ@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-108574-4@http.gcc.gnu.org/bugzilla/>
References: <bug-108574-4@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=3D108574

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
            Summary|wrong code at -Os and above |[13 Regression] wrong code
                   |on x86_64-linux-gnu         |at -Os and above on
                   |                            |x86_64-linux-gnu
   Target Milestone|---                         |13.0
           Keywords|                            |wrong-code
   Last reconfirmed|                            |2023-01-27
             Status|UNCONFIRMED                 |NEW

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Zhendong Su from comment #0)
> It appears to be a recent regression from 12.2.

In the testcase from comment #0, pre is messing it up because of an
uninitialized variable on one path (which is not taken).

Note somehow the statement:
d >=3D b;
changes the IR slightly ...

testcase in comment #1 also depends on an uninitialized variable on a path =
not
taken too (in that case j).

testcase in comment #2 also looks similar and depends on an unintialized
variable on a path not taken too.=