Date: Sun, 24 Dec 2000 08:35:05 +1100 From: "Andrew Reilly" <areilly@bigpond.net.au> To: Mike Smith <msmith@FreeBSD.ORG> Cc: Sergey Babkin <babkin@bellatlantic.net>, heckfordj@psi-domain.co.uk, freebsd-hackers@FreeBSD.ORG Subject: Re: Pentium 4 Message-ID: <20001224083504.A4161@gurney.reilly.home> In-Reply-To: <200012222338.eBMNcfj06065@mass.osd.bsdi.com>; from msmith@FreeBSD.ORG on Fri, Dec 22, 2000 at 03:38:41PM -0800 References: <3A43E22B.61A7A49C@bellatlantic.net> <200012222338.eBMNcfj06065@mass.osd.bsdi.com>
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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
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