From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: "Eli Zaretskii" Newsgroups: gmane.emacs.devel Subject: Re: (elisp)Numbers Date: Sat, 25 Oct 2003 00:15:57 +0200 Sender: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Message-ID: <3099-Sat25Oct2003001556+0200-eliz@elta.co.il> References: <200310210229.h9L2TGl12085@raven.dms.auburn.edu> <9743-Wed22Oct2003174239+0200-eliz@elta.co.il> <9178-Fri24Oct2003155041+0200-eliz@elta.co.il> Reply-To: Eli Zaretskii NNTP-Posting-Host: deer.gmane.org X-Trace: sea.gmane.org 1067034347 20650 80.91.224.253 (24 Oct 2003 22:25:47 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Fri, 24 Oct 2003 22:25:47 +0000 (UTC) Cc: schwab@suse.de, emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Sat Oct 25 00:25:44 2003 Return-path: Original-Received: from quimby.gnus.org ([80.91.224.244]) by deer.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 1ADANM-0005xx-00 for ; Sat, 25 Oct 2003 00:25:44 +0200 Original-Received: from monty-python.gnu.org ([199.232.76.173]) by quimby.gnus.org with esmtp (Exim 3.35 #1 (Debian)) id 1ADANL-0004He-00 for ; Sat, 25 Oct 2003 00:25:43 +0200 Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org) by monty-python.gnu.org with esmtp (Exim 4.24) id 1ADANI-0000pX-M6 for emacs-devel@quimby.gnus.org; Fri, 24 Oct 2003 18:25:40 -0400 Original-Received: from list by monty-python.gnu.org with tmda-scanned (Exim 4.24) id 1ADANB-0000oj-CX for emacs-devel@gnu.org; Fri, 24 Oct 2003 18:25:33 -0400 Original-Received: from mail by monty-python.gnu.org with spam-scanned (Exim 4.24) id 1ADAMc-0000Xx-BF for emacs-devel@gnu.org; Fri, 24 Oct 2003 18:25:29 -0400 Original-Received: from [199.232.41.8] (helo=mx20.gnu.org) by monty-python.gnu.org with esmtp (TLSv1:DES-CBC3-SHA:168) (Exim 4.24) id 1ADAKZ-0007io-BC for emacs-devel@gnu.org; Fri, 24 Oct 2003 18:22:51 -0400 Original-Received: from [192.114.186.22] (helo=gollum.inter.net.il) by mx20.gnu.org with esmtp (Exim 4.24) id 1ADAJg-0003gH-Be for emacs-devel@gnu.org; Fri, 24 Oct 2003 18:21:56 -0400 Original-Received: from zaretski (pns03-204-110.inter.net.il [80.230.204.110]) by gollum.inter.net.il (Mirapoint Messaging Server MOS 3.3.7-GR) with ESMTP id BRP73944; Sat, 25 Oct 2003 00:21:51 +0200 (IST) Original-To: Eli Zaretskii X-Mailer: emacs 21.3.50 (via feedmail 8 I) and Blat ver 1.8.9 In-reply-to: <9178-Fri24Oct2003155041+0200-eliz@elta.co.il> X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.2 Precedence: list List-Id: Emacs development discussions. List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Xref: main.gmane.org gmane.emacs.devel:17412 X-Report-Spam: http://spam.gmane.org/gmane.emacs.devel:17412 > Date: Fri, 24 Oct 2003 15:50:41 +0200 > From: "Eli Zaretskii" > > > From: Andreas Schwab > > Date: Fri, 24 Oct 2003 10:43:06 +0200 > > > > > > also, i compile with -O0. should that really open-code sqrt? > > > > Please check that sqrt is not a macro. > > Yes, it seems that sqrt is expanded into inline code that always > issues the FSQRT instruction, and doesn't set errno. Here's the code I see with "gcc -E -O2" on fencepost (I reformatted it for better readability): extern __inline double sqrt ( double __x) { register double __result; __asm __volatile__ ( "fsqrt" : "=t" (__result) : "0" (__x) ); return __result; } As you see, it never sets errno.