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 EEDB13893649; Fri, 24 Apr 2020 09:22:00 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org EEDB13893649
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1587720120;
 bh=KiT1QaX1WpJd5+c7jxL8CfO2Rl4lk8PnJQkIcjPhzlY=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=kqPZgSr3X6DRZxQvhwmMCy8ET3JrZT1xFfvJrQBX9jVyGWMDTtCETgSUwmDOP6uq4
 RzLxeyzZVWYxSzBRFGmtIU4EMEu0nmYeG8kRz3ruEaxX5hWT3fsMvrcxOCA1QXVKjL
 MsNVJCEuM5OAxAzXES8V+W5DkCw++6FW3BhJ8PwQ=
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94734] [10 Regression] Program crashes when
 compiled with -O2 since r10-1892-gb9ef6a2e04bfd013
Date: Fri, 24 Apr 2020 09:22:00 +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: 10.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
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: 10.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-94734-4-1XX6iewbmg@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-94734-4@http.gcc.gnu.org/bugzilla/>
References: <bug-94734-4@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
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <http://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <http://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Fri, 24 Apr 2020 09:22:01 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94734

--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #13)
> Even better.

Note none of the committed testcases would be handled with this.  There's
also the issue of store data races (not sure if the notrap handling is
correct there, it looks like not) - for auto variables that would not
be an issue (but would need to be checked extra).  A dominating store
to the same location isn't enough to prove validity either since
that might be inside a different protected region.=