Re: Cyrix M2

Aaron Tiensivu (
Thu, 24 Apr 1997 16:14:55 -0400

On Thu, Apr 24, 1997 at 05:46:29PM +0200, Ingo Molnar wrote:
> On Thu, 24 Apr 1997, Mike Jagdis wrote:
> > (Cyrix had to use FP registers for MMX to be at all compatible
> > with Intel. I don't think they liked having to do it :-). Intel
> > did it to save the cost of engineering their silicon to hold a
> > few more registers.)
> has anyone measured how fast the K6 switches between MMX and FPU mode?
> - -- mingo

It's rumoured to take 1 cycle, unlike P5MMX's 60 cycles.
I'd really like to see some benchmarks to prove it though.

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