From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: [Emacs-diffs] /srv/bzr/emacs/trunk r107377: * src/lisp.h: Improve comment about USE_LSB_TAG. Date: Wed, 22 Feb 2012 22:28:28 -0800 Message-ID: <4F45DC8C.9040607@verizon.net> References: <4F459455.8070206@verizon.net> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1329978510 28577 80.91.229.3 (23 Feb 2012 06:28:30 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Thu, 23 Feb 2012 06:28:30 +0000 (UTC) Cc: emacs-devel@gnu.org To: YAMAMOTO Mitsuharu Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Feb 23 07:28:30 2012 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([140.186.70.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1S0SAH-0007Mm-05 for ged-emacs-devel@m.gmane.org; Thu, 23 Feb 2012 07:28:29 +0100 Original-Received: from localhost ([::1]:42058 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1S0SAG-0001hu-Eb for ged-emacs-devel@m.gmane.org; Thu, 23 Feb 2012 01:28:28 -0500 Original-Received: from eggs.gnu.org ([140.186.70.92]:49025) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1S0SAE-0001hp-Hx for emacs-devel@gnu.org; Thu, 23 Feb 2012 01:28:27 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1S0SAD-0008DL-5u for emacs-devel@gnu.org; Thu, 23 Feb 2012 01:28:26 -0500 Original-Received: from vms173001pub.verizon.net ([206.46.173.1]:56271) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1S0SAD-0008DG-2b for emacs-devel@gnu.org; Thu, 23 Feb 2012 01:28:25 -0500 Original-Received: from [192.168.1.10] ([unknown] [71.189.109.235]) by vms173001.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0LZU0099N1ZBCJFV@vms173001.mailsrvcs.net> for emacs-devel@gnu.org; Thu, 23 Feb 2012 00:28:24 -0600 (CST) User-Agent: Mozilla/5.0 (X11; Linux i686; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 In-reply-to: X-detected-operating-system: by eggs.gnu.org: Solaris 10 (1203?) X-Received-From: 206.46.173.1 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:148719 Archived-At: On 02/22/2012 07:57 PM, YAMAMOTO Mitsuharu wrote: > Does "untagging by subtraction instead of masking" improve the > performance of USE_LSB_TAG in your platform? I'm sure it would, though I haven't measured it. I'm surprised that this hasn't been implemented in Emacs already. It's a standard technique (I first saw it in the 1980s), and it's clearly faster that what Emacs is doing now. We should look into incorporating it after 24.1 comes out.