From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.devel Subject: Re: Optimizing =?utf-8?b?4oCYc3RyaW5nPeKAmQ==?= Date: Fri, 02 Jul 2010 15:32:15 +0200 Message-ID: <871vbmui00.fsf@gnu.org> References: <87k4pqj1pc.fsf@gnu.org> <87eifyhhxg.fsf@gnu.org> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Trace: dough.gmane.org 1278077550 19099 80.91.229.12 (2 Jul 2010 13:32:30 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Fri, 2 Jul 2010 13:32:30 +0000 (UTC) Cc: guile-devel@gnu.org To: Andy Wingo Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Fri Jul 02 15:32:27 2010 Return-path: Envelope-to: guile-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 1OUgLx-00035j-Mu for guile-devel@m.gmane.org; Fri, 02 Jul 2010 15:32:26 +0200 Original-Received: from localhost ([127.0.0.1]:55555 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OUgLx-0007Vf-66 for guile-devel@m.gmane.org; Fri, 02 Jul 2010 09:32:25 -0400 Original-Received: from [140.186.70.92] (port=43618 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OUgLs-0007St-V3 for guile-devel@gnu.org; Fri, 02 Jul 2010 09:32:22 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OUgLr-0006gu-Jw for guile-devel@gnu.org; Fri, 02 Jul 2010 09:32:20 -0400 Original-Received: from mail2-relais-roc.national.inria.fr ([192.134.164.83]:2902) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OUgLr-0006gg-Bq for guile-devel@gnu.org; Fri, 02 Jul 2010 09:32:19 -0400 X-IronPort-AV: E=Sophos;i="4.53,526,1272837600"; d="scan'208";a="54384532" Original-Received: from reverse-83.fdn.fr (HELO nixey) ([80.67.176.83]) by mail2-relais-roc.national.inria.fr with ESMTP/TLS/DHE-RSA-AES128-SHA; 02 Jul 2010 15:32:17 +0200 X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 14 Messidor an 218 de la =?iso-8859-1?Q?R=E9volution?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 83C4 F8E5 10A3 3B4C 5BEA D15D 77DD 95E2 EA52 ECF4 X-OS: x86_64-unknown-linux-gnu In-Reply-To: (Andy Wingo's message of "Tue, 22 Jun 2010 23:54:38 +0200") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:10603 Archived-At: Hello Andy! Andy Wingo writes: > On Tue 22 Jun 2010 23:32, ludo@gnu.org (Ludovic Court=C3=A8s) writes: > >> Andy Wingo writes: >> >>> Nasty, but OK I guess if you need it. Why not also add a fast path for >>> scm_is_eq (s1, s2), or for comparing stringbufs, or something ? >> >> Hmm yes. Though if there are too many fast paths the whole thing ends >> up being slow. ;-) > >> I don=E2=80=99t expect (eq? s1 s2) and (eq? (string-buf s1) (string-buf = s2)) to >> be common enough to warrant a more specific special case, though. > > Does it affect your original case at all? No, I was just comparing strings not eq?. > In any event, it doesn't involve a memory dereference, only a > branch. It's a cheap check. Even cheaper to not do it. :-) Thanks, Ludo=E2=80=99.