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 42B9F38930D5; Fri, 24 Apr 2020 07:52:20 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 42B9F38930D5
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1587714740;
 bh=c/0wlIDDlaAQc7/MjRxYp3RT215hnLhatsz+hL4xwUU=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=IGcXWl79V87b5vN5Ewbb+qYCY7iKM6s3km2aJanF3Tkld6C/qTFhPCQBIPy7SeDdt
 DfN4iQVHw9EVn4g6cWnbbHHCR0FY7ciDgRueiEHSb0ZKT+1YDP8ODnVf3bv8a50NAU
 6nCw3XVgq4f+PayvPowaGVOccTDDjQoduVy5pILs=
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 07:52:20 +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-OZrpwEwA7y@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 07:52:20 -0000

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

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
In particular tree_could_trap_p woudl consider the load possibly trapping
due to the variable indexing but the patch seems to override that which
I agree is bogus.  I think we need to revert it and re-implement for GCC 11.
All testcases contain a dominating load in the condition and what we _can_
do is treat loads of stack variables the same as stores as far as
non-trappingness is concerned.=