From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 956 invoked by alias); 16 Jul 2004 17:09:58 -0000 Mailing-List: contact libc-hacker-help@sources.redhat.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-hacker-owner@sources.redhat.com Received: (qmail 899 invoked from network); 16 Jul 2004 17:09:55 -0000 Received: from unknown (HELO myware.akkadia.org) (148.63.57.162) by sourceware.org with SMTP; 16 Jul 2004 17:09:55 -0000 Received: from [192.168.7.70] (drepper@myware.akkadia.org [192.168.7.70]) by myware.akkadia.org (8.12.11/8.12.11) with ESMTP id i6GH7G9n016158; Fri, 16 Jul 2004 10:07:16 -0700 Message-ID: <40F80B44.9020305@redhat.com> Date: Fri, 16 Jul 2004 17:09:00 -0000 From: Ulrich Drepper Organization: Red Hat, Inc. User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8a2) Gecko/20040710 MIME-Version: 1.0 To: Jakub Jelinek CC: Glibc hackers Subject: Re: [PATCH] Fix powl on i386/x86_64 [BZ #258] (take 2) References: <20040714160203.GQ5191@sunsite.ms.mff.cuni.cz> <20040715093555.GA9816@sunsite.ms.mff.cuni.cz> In-Reply-To: <20040715093555.GA9816@sunsite.ms.mff.cuni.cz> X-Enigmail-Version: 0.84.1.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-SW-Source: 2004-07/txt/msg00035.txt.bz2 Jakub Jelinek wrote: > -4: fldl MO(one) // 1 : x > +4: fld1 // 1 : x I deliberately avoided the use of fld1 since all my measurements showed it is slower. Please some some measurements of your own. As far as I remember the only time when it paid off to use fld1 is when the fld was the only memory operation and therefore it could be avoided to load the PIC register. -- ➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖