ST(i) and MMj

[Jim Blandy]

I certainly could be missing something...

>   * Change functions that read and write registers from/to memory to
>     handle the MMX registers specially by looking at the appropriate
>     ST(i) register instead.

Which functions would these be, exactly?

On the i386, both variable references and direct register references
(like $eax) go through (via a torturous chain of calls)
read_register_gen, which just reaches directly into the register file.

I think I'd need to see a very specific explanation of how to do this,
showing which functions to change, etc.  Talking about it at a higher
level is just getting confusing.