From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3556 invoked by alias); 30 May 2014 08:33:25 -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 3479 invoked by uid 48); 30 May 2014 08:33:18 -0000 From: "ktietz at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/59429] Missed optimization opportunity in qsort-style comparison functions Date: Fri, 30 May 2014 08:33:00 -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: 4.8.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: minor X-Bugzilla-Who: ktietz 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: 2014-05/txt/msg02541.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59429 --- Comment #13 from Kai Tietz --- Hmm, I don't see what binary-combine helper would help here? It might be a good thing to have such a abstract-representation for doing logical optimizations of comparison chains. Nevertheless this seems to me being not the solution for the given issue here. The issue - described in this problem - is more related to simple pattern-matching. So normalization in such cases seems to be the way to go.