RE: AMD optimizations?

Jones D (djones2@glam.ac.uk)
Thu, 26 Aug 1999 13:48:35 +0100

> > Yes, I just read about the fpu patch on
> > http://www.tiac.net/users/rlk/linux.html
> > As the AMD CPU's don't have pipelined FPU's, this probably
> isn't a good
> > thing to apply for K6 systems, but it may have a good
> result on the Athlon.
> For K6 or Cyrix you would use MMX not FPU for this.

Anyone know if any MMX patches exist for this function anywhere?
If not, I may give it a try this weekend.

> MMX memcpy is about 45% faster on the Athlon than rep movs

I heard the Athlon's FPU performance beats all x86's.
If MMX is faster than FPU, then yes, the patch in the URL above
would be useless, but I've no hardware to bench on yet.. :-)

d.

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