Messages in this thread | | | Date | Thu, 24 Apr 1997 10:44:58 -0400 | From | Raul Miller <> | Subject | Re: Cyrix M2 |
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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.)
On Apr 24, Joerg Pommnitz wrote > AFAIK the main reason was, not to break existing operating systems. > These OS don't know how to save MMX registers on task switchs. I > don't see how Cyrix would have solved this problem.
Wouldn't be hard to put in a state bit which defaults to MMX overlays FP but could be set to MMX independent of FP. [Presuming you wanted to invest in the real estate for the separate register set.]
-- Raul
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