From owner-freebsd-hackers Sat Dec 23 13:36:23 2000 From owner-freebsd-hackers@FreeBSD.ORG Sat Dec 23 13:36:21 2000 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from sr14.nsw-remote.bigpond.net.au (sr14.nsw-remote.bigpond.net.au [24.192.3.29]) by hub.freebsd.org (Postfix) with ESMTP id D9A1337B400 for ; Sat, 23 Dec 2000 13:35:14 -0800 (PST) Received: from areilly.bpc-users.org (CPE-144-132-234-126.nsw.bigpond.net.au [144.132.234.126]) by sr14.nsw-remote.bigpond.net.au (Pro-8.9.3/8.9.3) with SMTP id IAA28214 for ; Sun, 24 Dec 2000 08:35:06 +1100 (EDT) Received: (qmail 4184 invoked by uid 1000); 23 Dec 2000 21:35:05 -0000 From: "Andrew Reilly" Date: Sun, 24 Dec 2000 08:35:05 +1100 To: Mike Smith Cc: Sergey Babkin , heckfordj@psi-domain.co.uk, freebsd-hackers@FreeBSD.ORG Subject: Re: Pentium 4 Message-ID: <20001224083504.A4161@gurney.reilly.home> References: <3A43E22B.61A7A49C@bellatlantic.net> <200012222338.eBMNcfj06065@mass.osd.bsdi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <200012222338.eBMNcfj06065@mass.osd.bsdi.com>; from msmith@FreeBSD.ORG on Fri, Dec 22, 2000 at 03:38:41PM -0800 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG One big difference of the P4 is the SSE2 instructions and registers. It's now reasonable to ignore the old floating point stack altogether, and do floating point work with the SSE register file, getting the SIMD speed up where that's useful. (Because sse can now do doubles as well as floats.) However that depends on the OS doing the appropriate saves on the SSE register file on context switches. Do we do that (yet)? -- Andrew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message