From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 23564 invoked by alias); 15 Aug 2014 15:39:41 -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 23376 invoked by uid 48); 15 Aug 2014 15:39:37 -0000 From: "amker at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/62151] [5 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu Date: Fri, 15 Aug 2014 15:39:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: rtl-optimization X-Bugzilla-Version: 5.0 X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: amker at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 5.0 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: 2014-08/txt/msg01095.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62151 --- Comment #6 from amker at gcc dot gnu.org --- (In reply to Richard Biener from comment #5) > Note that probably also made a latent issue pop up. Indeed. After preliminary investigation, I think this case reveals two latent issues. The first one is a missed optimization opportunity on GIMPLE, while the second one is a wrong code issue in RTL combine. I will firstly look into the combine issue and send a report later. Thanks, bin