From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21645 invoked by alias); 16 Oct 2014 13:03:29 -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 21578 invoked by uid 48); 16 Oct 2014 13:03:25 -0000 From: "glisse at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/63185] Improve DSE with branches Date: Thu, 16 Oct 2014 13:03:00 -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: 5.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: glisse at gcc dot gnu.org X-Bugzilla-Status: NEW 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: 2014-10/txt/msg01262.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63185 --- Comment #4 from Marc Glisse --- (In reply to Richard Biener from comment #3) > Btw, what was the original testcase? Sorry, I don't remember. Probably something involving std::vector or std::string. Since llvm optimizes it just fine, I hadn't realized it would be so hard. > That is, without making the walk very much more expensive there isn't > anything we can do about this. Ok, thanks for looking at it. Down to P5?