Date: Wed, 26 Feb 1997 14:18:35 -0800 (PST) From: asami@vader.cs.berkeley.edu (Satoshi Asami) To: Brett_Glass_at_POST-IW1@infoworld.com Cc: bde@zeta.org.au, jin@george.lbl.gov, mark@quickweb.com, freebsd-hardware@FreeBSD.ORG, kuku@gilberto.physik.rwth-aachen.de, robsch@robkaos.ruhr.de Subject: Re: Memory speed of P6-200 (256k) Message-ID: <199702262218.OAA02909@vader.cs.berkeley.edu> In-Reply-To: <8825644A.00612942.00@IWND1.infoworld.com> (Brett_Glass_at_POST-IW1@infoworld.com)
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* How about MMX, guys? Is there any way to speed up copies by bursting in and * out of the MMX registers? The FPU? The P5-optimized copyin/out already uses the FPU. We've verified that it doesn't help the 486 and P6 (at least with Orion and Natoma). I don't know about MMX, but from what Bruce has observed, it may help lower the cost of load/store (which is pretty tough on CPUs for floating-point ops). If someone with an MMX can step forward to be the guinea pig, I'm sure Bruce will be happy to help. :) Satoshi
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