From owner-freebsd-standards  Fri Apr 12 11:37:42 2002
Delivered-To: freebsd-standards@freebsd.org
Received: from rover.village.org (rover.bsdimp.com [204.144.255.66])
	by hub.freebsd.org (Postfix) with ESMTP id BF82637B404
	for <freebsd-standards@FreeBSD.ORG>; Fri, 12 Apr 2002 11:37:40 -0700 (PDT)
Received: from harmony.village.org (harmony.village.org [10.0.0.6])
	by rover.village.org (8.11.3/8.11.3) with ESMTP id g3CIbdi16001;
	Fri, 12 Apr 2002 12:37:39 -0600 (MDT)
	(envelope-from imp@village.org)
Received: from localhost (warner@rover2.village.org [10.0.0.1])
	by harmony.village.org (8.11.6/8.11.6) with ESMTP id g3CIbbc53110;
	Fri, 12 Apr 2002 12:37:37 -0600 (MDT)
	(envelope-from imp@village.org)
Date: Fri, 12 Apr 2002 12:37:34 -0600 (MDT)
Message-Id: <20020412.123734.61861702.imp@village.org>
To: wollman@lcs.mit.edu
Cc: tim@robbins.dropbear.id.au, freebsd-standards@FreeBSD.ORG
Subject: Re: standards/36783
From: "M. Warner Losh" <imp@village.org>
In-Reply-To: <200204121822.g3CIM4491247@khavrinen.lcs.mit.edu>
References: <200204121639.g3CGdOZ90234@khavrinen.lcs.mit.edu>
	<20020412.121645.03985114.imp@village.org>
	<200204121822.g3CIM4491247@khavrinen.lcs.mit.edu>
X-Mailer: Mew version 2.1 on Emacs 21.1 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-standards@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-standards.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-standards>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-standards>
X-Loop: FreeBSD.ORG

In message: <200204121822.g3CIM4491247@khavrinen.lcs.mit.edu>
            Garrett Wollman <wollman@lcs.mit.edu> writes:
: <<On Fri, 12 Apr 2002 12:16:45 -0600 (MDT), "M. Warner Losh" <imp@village.org> said:
: 
: > This is no longer true.  Long doubles can and do give better precision
: > than doubles, but at a high performance cost.
: 
: Is GCC now emitting code to change the rounding mode from 53-bit to
: 80-bit whenever it works with long doubles?

I haven't looked at the generated code, but I think so.  I've been
able to get better precision from long doubles than doubles in
experimental code. (eg, 1 + epsilon allows me a smaller epsilon with
long double than double).

Warner


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-standards" in the body of the message