Date: Fri, 7 May 1999 23:25:15 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Andrew Reilly <andrew@lake.com.au> Cc: Zach Brown <zab@zabbo.net>, Matthew Dillon <dillon@apollo.backplane.com>, freebsd-hackers@freebsd.org Subject: Re: Pentium-III and FreeBSD? Message-ID: <Pine.BSF.4.05.9905072323390.18703-100000@herring.nlsystems.com> In-Reply-To: <19990508080842.A11385@gurney.reilly.home>
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On Sat, 8 May 1999, Andrew Reilly wrote: > On Fri, May 07, 1999 at 11:15:53AM -0400, Zach Brown wrote: > > > In regards to FP: The best place for extreme FP optimization is in > > > a high level FP library, not in native compiler-produced code. The > > > > yes. > > That's pretty much all I really want to do, but the catch with > the P-III is that the new SIMD registers do _not_ map over the > fp registers, the way MMX did. They are new processor state. > > So we need OS support to save and restore them on context > switches. Intel supplies a "patch" for NT that does this, > appently. > > Should be an interesting introduction to the bottom levels of > the kernel. If you fix this, I can review it. I more or less promised this support to the XFree86 folks if they started using the extra state. You should also consider the AMD 3DNow! stuff which also has extra state I think. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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