From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Leo Liu Newsgroups: gmane.emacs.devel Subject: why is reverse a string in-place so much slower than a vector? Date: Fri, 25 Apr 2014 16:12:16 +0800 Message-ID: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1398413583 15772 80.91.229.3 (25 Apr 2014 08:13:03 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 25 Apr 2014 08:13:03 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Apr 25 10:12:56 2014 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 1WdbFe-0004mB-0p for ged-emacs-devel@m.gmane.org; Fri, 25 Apr 2014 10:12:54 +0200 Original-Received: from localhost ([::1]:56513 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WdbFd-0001br-EY for ged-emacs-devel@m.gmane.org; Fri, 25 Apr 2014 04:12:53 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:34723) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WdbFT-0001Wj-21 for emacs-devel@gnu.org; Fri, 25 Apr 2014 04:12:50 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WdbFL-0005NB-IV for emacs-devel@gnu.org; Fri, 25 Apr 2014 04:12:42 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:40436) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WdbFL-0005Mz-Bl for emacs-devel@gnu.org; Fri, 25 Apr 2014 04:12:35 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1WdbFJ-0004Bb-KZ for emacs-devel@gnu.org; Fri, 25 Apr 2014 10:12:33 +0200 Original-Received: from 123.115.255.237 ([123.115.255.237]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 25 Apr 2014 10:12:33 +0200 Original-Received: from sdl.web by 123.115.255.237 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 25 Apr 2014 10:12:33 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 8 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 123.115.255.237 Face: iVBORw0KGgoAAAANSUhEUgAAACgAAAAoBAMAAAB+0KVeAAAAG1BMVEUAAAA9Cgm3Hx1WWFWA gn+WmJWsrqv4+vcCAwCRl2MkAAAAAXRSTlMAQObYZgAAAAFiS0dEAIgFHUgAAAAJcEhZcwAAAYoA AAGKATOXMFgAAAAHdElNRQfXAQwDNR+ZJmElAAABIklEQVQoz22SPW+DQAyGWUq65qasd9PNUSX4 AZHK2C1rJy5jpDS4IwRVup9dn7GNafpKIPPgzztXFSujqq1eM2n8h22oMkvxI/i9C97kRfMRUN55 dS3BrsAwBXUtMLAO4lryh8kTjOxKpQNniNxAgZOEe4bZwsDTFhKdqZRLNII4OQNHhEuq/RMkm6Cj TnnEA/fk0BorcYn5qA3oaeAxbaBOLrX+9G48NZ2Fzc2tzDM8Q+tMypEOqYHh8mAWaaK3U/cDMOT5 aMZMABgPXc7zPMs1A8DXO756GFJ/4fMEq47hTsAdn5avoxZ4ywl0c2w4Flu2Ybeyb3S+EqxX2DYA H8veJGEDTnHnrXvRaPyt+2kSfK6rfBZ2tUtfP/mR+pR6sX8BUZ/cDV7tvkoAAAAASUVORK5CYII= User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (CentOS 6.5) Cancel-Lock: sha1:lJ6b2vl2FUOOnk628nqVidtxoUQ= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 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:171620 Archived-At: (defun rev (a) (let ((l (length a))) (dotimes (i (floor l 2) a) (cl-rotatef (aref a i) (aref a (1- (- l i))))))) -- Sent from my Emacs