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 E170E3882AC6; Tue, 18 Jun 2024 12:46:53 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E170E3882AC6
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1718714813;
	bh=016SfqaH0J+emnEN/U6q1wNkf57k6hJOY2M9Fjp7z58=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=KmHZFt1OnJZeVy9b3oQOLlyzmKgG0WzlHENRYfZ7PEGL6CZwOOzqCI60yyXyH2APD
	 cz3ZeyfKgxijonA+Ka+7vAw7663Lfr/NG/k4aPXGvCtX8h86RjOhnH1Ba6L1GSi+kh
	 bXEy00tNOdAIXyvx6+Ju830ib/tLRO1ZpETHkol0=
From: "sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/115539] Misoptimization of application at -O2 -g on x86-64
 causing segfaults on valid memory accesses where it works on both clang and
 gcc at -g (no -O2)
Date: Tue, 18 Jun 2024 12:46:53 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 14.1.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: sjames at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-115539-4-3vesPlfdKK@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-115539-4@http.gcc.gnu.org/bugzilla/>
References: <bug-115539-4@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=3D115539

--- Comment #5 from Sam James <sjames at gcc dot gnu.org> ---
fastreadl_fetch in particular looks aliasing unsafe, let alone the rest.=