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: Re: [RFC] bytecomp: simple source-level optimization Date: Mon, 23 Jun 2014 16:29:23 +0800 Message-ID: References: <53A7CCAB.7020807@yandex.ru> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1403512206 13720 80.91.229.3 (23 Jun 2014 08:30:06 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 23 Jun 2014 08:30:06 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Jun 23 10:30:00 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 1WyzdW-00052K-I3 for ged-emacs-devel@m.gmane.org; Mon, 23 Jun 2014 10:29:58 +0200 Original-Received: from localhost ([::1]:51789 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WyzdW-0002ML-4k for ged-emacs-devel@m.gmane.org; Mon, 23 Jun 2014 04:29:58 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:42308) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WyzdK-0002Ki-Rb for emacs-devel@gnu.org; Mon, 23 Jun 2014 04:29:55 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WyzdC-0006tm-EO for emacs-devel@gnu.org; Mon, 23 Jun 2014 04:29:46 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:38331) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WyzdC-0006tR-7U for emacs-devel@gnu.org; Mon, 23 Jun 2014 04:29:38 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Wyzd9-0004ff-Ap for emacs-devel@gnu.org; Mon, 23 Jun 2014 10:29:35 +0200 Original-Received: from 221.222.158.228 ([221.222.158.228]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 23 Jun 2014 10:29:35 +0200 Original-Received: from sdl.web by 221.222.158.228 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 23 Jun 2014 10:29:35 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 17 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 221.222.158.228 Face: iVBORw0KGgoAAAANSUhEUgAAACgAAAAoBAMAAAB+0KVeAAAAElBMVEUAAAAAAP+LRRP0pGC+ vr7///+7mT1iAAAAAWJLR0QAiAUdSAAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9cBBwMO DhglKe4AAAEsSURBVCjPbZNBboQwDEV/Cd4X9QJRThApmn0XYW+Jyf2v0m+HhqDBgiAe9rcTG7QH w/1Vn2Ar8gBb/ocywSN3qK9T3z4eFDB4eApocBpeBs1RSykoJd8gQcm8pGmHXFso3ajnmsqV0TnY DQkOfXUfN5NwaI7AWTVOyEhcu1aHmdWItHddUVUcUgUBCkitu8V6ditHVOVdqzl2EQ1ZVGTbdK0V 7cqn8vWzoU5Q/bF9Y/Y0cRU1xwkys5dJ+Dt6pBDWifcNQml8Gh2JVmPSoQzo7en0grswkxrUGYJ7 0hSxxAGr7ZMwYcHIzprpi7TENEE1xtiYxixRlCfPBsUUrwHD7uGIwATrbnODJcVrPpVn3hxiGloe m/S+z3CtuzUSMo83N4DPH+F0evwR3P4A2k+75838OKQAAAAASUVORK5CYII= User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (CentOS 6.5) Cancel-Lock: sha1:LOhvBhs/lK4Zb0bHzjdrXneZqXo= 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:172645 Archived-At: On 2014-06-23 10:43 +0400, Dmitry Antipov wrote: > Source forms like: > > (if (= (point) (point-min)) ...) > > or: > > (if (eq (point-max) (point)) ...) > > are widely used, but compiled as is, which is suboptimal. > The first one can be optimized to (if (bobp) ...) and the > second to (if (eobp) ...), respectively. Optimise for unidiomatic code in non-performace-critical cases? Not sure ;) Leo