From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 30226 invoked by alias); 13 May 2014 13:25:42 -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 30205 invoked by uid 48); 13 May 2014 13:25:39 -0000 From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/61169] [4.6,4.7,4.8,4.9] unnecessarily honors bracket in mathematical statements Date: Tue, 13 May 2014 13:25:00 -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: 4.6.3 X-Bugzilla-Keywords: X-Bugzilla-Severity: minor X-Bugzilla-Who: rguenth 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: bug_status resolution 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: 2014-05/txt/msg01155.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61169 Richard Biener changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #2 from Richard Biener --- You want -ffast-math, or more specificall -fassociative-math. Re-association can change FP values which is not allowed and the first expression is (d * x) * x.