From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: [Emacs-diffs] master c66aaa6: Recomplexify =?utf-8?Q?=E2=80=98delete-trailing-whitespace=E2=80=99?= by treating \n as whitespace again Date: Wed, 15 Mar 2017 23:08:02 -0400 Message-ID: References: <20170315023157.29463.36647@vcs0.savannah.gnu.org> <20170315023159.30AA520CAB@vcs0.savannah.gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1489633707 7609 195.159.176.226 (16 Mar 2017 03:08:27 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 16 Mar 2017 03:08:27 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Mar 16 04:08:23 2017 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1coLlz-0001Et-Iq for ged-emacs-devel@m.gmane.org; Thu, 16 Mar 2017 04:08:19 +0100 Original-Received: from localhost ([::1]:40591 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1coLm5-00018i-LR for ged-emacs-devel@m.gmane.org; Wed, 15 Mar 2017 23:08:25 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:59397) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1coLlz-00018I-Gb for emacs-devel@gnu.org; Wed, 15 Mar 2017 23:08:20 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1coLlw-0006gn-CA for emacs-devel@gnu.org; Wed, 15 Mar 2017 23:08:19 -0400 Original-Received: from [195.159.176.226] (port=40629 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1coLlw-0006gQ-4y for emacs-devel@gnu.org; Wed, 15 Mar 2017 23:08:16 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1coLlm-0008SD-OS for emacs-devel@gnu.org; Thu, 16 Mar 2017 04:08:06 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 11 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:vV8uRqA5xGd0sltAAbjqeU4cO6o= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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" Xref: news.gmane.org gmane.emacs.devel:213070 Archived-At: >> I don't understand how "\\s-+$" can be significantly faster than >> "[\s\t]+$" in this respect. > What? I though I said "\\s-+" is *slower* (though only by a factor of 2). The bug#26079 seems to indicate that the old Emacs-25 code was a lot faster. Oh, I see. It's that the old code used "\\s-$" rather than "\\s-+$". Yes, that old code does avoid the quadratic effect this way. Stefan