From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Stephen J. Turnbull" Newsgroups: gmane.emacs.devel Subject: Re: fix for bug 10994 breaks ido customizations in major way Date: Sun, 05 May 2013 23:31:04 +0900 Message-ID: <87y5btjy6v.fsf@uwakimon.sk.tsukuba.ac.jp> References: <87ip2zm89w.fsf@wanadoo.es> <87vc6xsnhb.fsf@wanadoo.es> <87r4hlsjnj.fsf@wanadoo.es> <87mws9sg1a.fsf@wanadoo.es> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1367764392 13369 80.91.229.3 (5 May 2013 14:33:12 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 5 May 2013 14:33:12 +0000 (UTC) Cc: emacs-devel@gnu.org, Leo Liu , Le Wang To: =?utf-8?Q?=C3=93scar?= Fuentes Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sun May 05 16:33:10 2013 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UYzzw-0001xF-3g for ged-emacs-devel@m.gmane.org; Sun, 05 May 2013 16:33:08 +0200 Original-Received: from localhost ([::1]:45546 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UYzzv-0006gF-OT for ged-emacs-devel@m.gmane.org; Sun, 05 May 2013 10:33:07 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:52284) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UYzy6-0004mF-0q for emacs-devel@gnu.org; Sun, 05 May 2013 10:31:14 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UYzy5-0007Xo-6y for emacs-devel@gnu.org; Sun, 05 May 2013 10:31:13 -0400 Original-Received: from mgmt2.sk.tsukuba.ac.jp ([130.158.97.224]:50783) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UYzy4-0007XS-Rm for emacs-devel@gnu.org; Sun, 05 May 2013 10:31:13 -0400 Original-Received: from uwakimon.sk.tsukuba.ac.jp (uwakimon.sk.tsukuba.ac.jp [130.158.99.156]) by mgmt2.sk.tsukuba.ac.jp (Postfix) with ESMTP id F2EE7970957; Sun, 5 May 2013 23:31:04 +0900 (JST) Original-Received: by uwakimon.sk.tsukuba.ac.jp (Postfix, from userid 1000) id B9E2D1A2989; Sun, 5 May 2013 23:31:04 +0900 (JST) In-Reply-To: <87mws9sg1a.fsf@wanadoo.es> X-Mailer: VM undefined under 21.5 (beta32) "habanero" b0d40183ac79 XEmacs Lucid (x86_64-unknown-linux) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 130.158.97.224 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:159339 Archived-At: =C3=93scar Fuentes writes: > So it seems that delete-dups is faster for strings than symbols. My interpretation is different: something is broken in the benchmarks (or in the estimate that the CPUs are of comparable performance). Comparing symbols for equality is a pointer comparison. Comparing strings for equality is a pointer comparison, followed by more work (some variation on a memcmp) in case of failure.