From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 22954 invoked by alias); 11 Nov 2011 23:04:08 -0000 Received: (qmail 22943 invoked by uid 22791); 11 Nov 2011 23:04:07 -0000 X-SWARE-Spam-Status: No, hits=-2.9 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 11 Nov 2011 23:03:53 +0000 From: "paolo.carlini at oracle dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/51078] [PATCH] performance improvement of std::count algorithm Date: Fri, 11 Nov 2011 23:36:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Keywords: X-Bugzilla-Severity: enhancement X-Bugzilla-Who: paolo.carlini at oracle dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 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 X-SW-Source: 2011-11/txt/msg01267.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51078 --- Comment #13 from Paolo Carlini 2011-11-11 23:03:38 UTC --- I would say, the next step, is analyzing why: std::count seems a very simple algorithm, no aliasing issues for example, compiler should be able to unroll, maybe vectorize too, and everything else, without having to fiddle with the code in an ad-hoc way.