From owner-freebsd-amd64@FreeBSD.ORG Sun Feb 13 18:56:40 2005 Return-Path: Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CFBC616A4CE for ; Sun, 13 Feb 2005 18:56:40 +0000 (GMT) Received: from mta.webmatic.de (mta.webmatic.de [212.78.99.126]) by mx1.FreeBSD.org (Postfix) with ESMTP id D2FA543D45 for ; Sun, 13 Feb 2005 18:56:39 +0000 (GMT) (envelope-from freebsd-amd64@chef-ingenieur.de) Received: (qmail 1044 invoked by uid 1003); 13 Feb 2005 18:56:35 -0000 Received: from freebsd-amd64@chef-ingenieur.de by mta.webmatic.de by uid 89 with qmail-scanner-1.22 (spamassassin: 2.63. Clear:RC:1(217.186.17.95):. Processed in 0.083923 secs); 13 Feb 2005 18:56:35 -0000 Received: from unknown (HELO ?192.168.1.100?) (freebsd-stable@chef-ingenieur.de@217.186.17.95) by mta.webmatic.de with (DHE-RSA-AES256-SHA encrypted) SMTP; 13 Feb 2005 18:56:35 -0000 Message-ID: <420FA306.8010102@chef-ingenieur.de> Date: Sun, 13 Feb 2005 19:57:10 +0100 From: Thomas Krause -CI- User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206) X-Accept-Language: de-DE, de, en-us, en MIME-Version: 1.0 To: Steve Kargl , freebsd-amd64@freebsd.org References: <420F9CA1.4040207@chef-ingenieur.de> <20050213184051.GA41566@troutmask.apl.washington.edu> In-Reply-To: <20050213184051.GA41566@troutmask.apl.washington.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: -mno-sse -mno-sse2 -mno-mmx -mno-3dnow when compiling kernel X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 13 Feb 2005 18:56:41 -0000 Steve Kargl schrieb: > On Sun, Feb 13, 2005 at 07:29:53PM +0100, Thomas Krause -CI- wrote: > >>Hello, >>why are the Switches "-mno-sse -mno-sse2 -mno-mmx -mno-3dnow" are set >>when compiling an amd64 kernel? I think, the CPU supports all thease >>features. >> > > > AFAIK, floating point is not permitted in the kernel. Why would > you need to use sse, sse2, mmx, or 3dnow? > I don't know, if thease features are useful in the kernel. But when compiling a x86 kernel, they are not disabled. As I remember, you can compile libpng using mmx features. (I'm unsure, if you need a mmx-optimized kernel for that.) Regards, Thomas.