From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 5032 invoked by alias); 8 Jul 2014 15:27:45 -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 4934 invoked by uid 48); 8 Jul 2014 15:27:40 -0000 From: "glisse at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/61747] min,max pattern not always properly optimized (for sse4 targets) Date: Tue, 08 Jul 2014 15:27:00 -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: 4.9.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: glisse at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED 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: 2014-07/txt/msg00479.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61747 --- Comment #3 from Marc Glisse --- (In reply to vincenzo Innocente from comment #2) > > I think you need -fno-signed-zeros for the transformation to be valid. > possible. > but then is the O2 code that is wrong? > in any case adding -fno-signed-zeros makes no difference w/r/t O2 alone -fno-signed-zeros comes in addition to some flag saying there are no NaNs (-ffinite-math-only for instance).