From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 29560 invoked by alias); 16 Feb 2014 23:10:48 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 29536 invoked by uid 48); 16 Feb 2014 23:10:45 -0000 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/60229] wrong code at -O2 and -O3 on x86_64-linux-gnu Date: Sun, 16 Feb 2014 23:10:00 -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: 4.7.4 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: RESOLVED 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: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2014-02/txt/msg01621.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60229 --- Comment #2 from Andrew Pinski --- Note there is no overflow happening here at all. In that a++ is the same as a = a + 1 which is the same as a = (short)(((int)a) + 1) due to promotion rules in C.