Messages in this thread | | | Date | Mon, 17 Aug 1998 13:23:34 +0200 | From | Thomas Sailer <> | Subject | Re: Winmodem support, some performance tradeoff estimates |
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Alan Cox wrote:
> Way off. Firstly Im dubious about the 8Mhz, secondly the R4K's tend to > have DSP instructions (ones that are useful). Pentiums dont have an > add/multiply with no stall instruction once per clock.
The fastest MAC on Intel Pentiums I've seen is the floating point MAC code (single) by Phil Karn, and it achieves one MAC every 3 cycles. And the code is pretty ugly (which isn't Phil's fault).
When I've tried to use MMX in one of my own projects, I ended up having fast multiplication but about 20 instructions before and afterwards to setup/clean up registers.
Tom
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