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 D984F385840E; Mon, 28 Nov 2022 08:49:06 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D984F385840E
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1669625346;
	bh=QqXGLTUSridt1jaHwLGN9kJWpop5uxUsKWPyomjcJS4=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=TQIl41I6uYljMjza72sUifojFws0qnJi8sYuD9ELnUIiJJNbvc1080wMKZ9XGuZUo
	 7Y752oQSFvfI6jrTzNOo5Gx5PbJmhXpPkrdYAcKTDvlmwRaXFSlK+uhdYnTL9X4XnC
	 d6Bxxm8t33stl79hL0TciXC/ToDAqQa35t9+TIjU=
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/107893] gcc trunk at -O0 (UBSan) misses a
 Null-pointer-dereference
Date: Mon, 28 Nov 2022 08:49:06 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: sanitizer
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jakub 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-107893-4-SHQMgIMJCc@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-107893-4@http.gcc.gnu.org/bugzilla/>
References: <bug-107893-4@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=3D107893

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
You don't store the shift result anywhere and there are no side-effects in =
the
expression, so nothing prevents the compiler from optimizing out the whole
expression.=