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 C54203858C62; Wed, 22 May 2024 21:43:55 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C54203858C62
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1716414235;
	bh=+5mtKkUArwADfWlMCwIQkRrKosR6UZ4txN/uXROJV6Y=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=LYpNN6ZM2e5JQFc2t9/JyfSeZVdiQTgp4szaBfm+2AHBbY7dBmoRXYBUl9o+LZoeB
	 f3hp1fvP6LfppOCAzudT3jvSJMwy/l/VQ+ovA/C50+Yu2W0Un1wOeoI+6+dVb5Mm0+
	 pdcxYRwY61AR37uf82iS4e6AuPQrmQEwn0sMIf3U=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/115199] [15 regression] gettext
 (libtextstyle) testsuite miscompiled
Date: Wed, 22 May 2024 21:43:55 +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: alias, 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: 15.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: target_milestone bug_status cc keywords
 cf_reconfirmed_on everconfirmed
Message-ID: <bug-115199-4-EwFGRSa3D9@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-115199-4@http.gcc.gnu.org/bugzilla/>
References: <bug-115199-4@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=3D115199

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |15.0
             Status|UNCONFIRMED                 |NEW
                 CC|                            |rguenth at gcc dot gnu.org
           Keywords|                            |alias
   Last reconfirmed|                            |2024-05-22
     Ever confirmed|0                           |1

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
```
  Deleted dead call: # .MEM_6 =3D VDEF <.MEM_4>
# PT =3D null { D.2790 }
# ALIGN =3D 8, MISALIGN =3D 0
e_7 =3D memcpyD.1670 (f_5, "z", 1);
```

Note the volatile makes the difference. It seems like we miss that the memo=
ry
escapes through the volatile store so we delete the memcpy as being dead.=