From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.devel Subject: Re: Compiling Elisp to a native code with a GCC plugin Date: Wed, 15 Sep 2010 17:31:22 +0200 Message-ID: References: <87bp805ecr.fsf@gmail.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: dough.gmane.org 1284564730 7419 80.91.229.12 (15 Sep 2010 15:32:10 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 15 Sep 2010 15:32:10 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Sep 15 17:32:09 2010 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Ovtxv-0004db-2V for ged-emacs-devel@m.gmane.org; Wed, 15 Sep 2010 17:32:07 +0200 Original-Received: from localhost ([127.0.0.1]:39232 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Ovtxt-0000fH-TJ for ged-emacs-devel@m.gmane.org; Wed, 15 Sep 2010 11:32:05 -0400 Original-Received: from [140.186.70.92] (port=36008 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OvtxY-0000XE-KD for emacs-devel@gnu.org; Wed, 15 Sep 2010 11:31:56 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OvtxE-0006ru-TJ for emacs-devel@gnu.org; Wed, 15 Sep 2010 11:31:44 -0400 Original-Received: from mail-out.m-online.net ([212.18.0.9]:38352) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OvtxE-0006ra-Ob for emacs-devel@gnu.org; Wed, 15 Sep 2010 11:31:24 -0400 Original-Received: from frontend1.mail.m-online.net (unknown [192.168.8.180]) by mail-out.m-online.net (Postfix) with ESMTP id AE2261C15AB6 for ; Wed, 15 Sep 2010 17:31:22 +0200 (CEST) Original-Received: from hase.home (ppp-88-217-113-189.dynamic.mnet-online.de [88.217.113.189]) by mail.mnet-online.de (Postfix) with ESMTP id 783A61C0026D for ; Wed, 15 Sep 2010 17:31:22 +0200 (CEST) X-Yow: What GOOD is a CARDBOARD suitcase ANYWAY? In-Reply-To: (Lars Magne Ingebrigtsen's message of "Wed, 15 Sep 2010 17:09:16 +0200") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:130212 Archived-At: Lars Magne Ingebrigtsen writes: > So you end up with > > (or (looking-at "foo ") (search-forward "\nfoo ")) > > which creates a regexp, anyway, and seems clumsy. > > So what I wonder is whether there is a smarter way to do this, in > general. (I'm assuming that a simple string search is faster than a > regexp search, but I've never actually benchmarked this.) Trivial regexp searches are already optimized to bypass the regexp engine. Doing a similar check in looking-at might be worthwhile. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."