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Re: MMX: Messy Multimedia eXtensions



> Mapping one register to two numbers is hazardous to any code that might
> exist which saves/restores the register file by naively looping through
> the register numbers.

Right.  And in my quick survey, it looked like there were other
problems, too.  For example, what would write_register_bytes do?

> Don't the Pentium 3 "SSE" extensions make FP+MMX registers become truly
> distinct registers? I suppose you're taking it as a given that we already
> know how to handle this case; just thought I should mention it anyway...

The Streaming SIMD Extensions do add a new set of registers, but the
MMX registers remain mapped to the FP register mantissas.

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