Your opinion is, in many ways, flawed. The cost of doing
floating-point on non-FP hardware is such that the cost of emulation
is not a significant overhead. The same doesn't apply for MMX, which
is an integer optimization. Simply put, emulated MMX is too slow to
be used (typically, it will take over 500 cycles to do the two context
switches you need for emulation, and no MMX-instruction-equivalent is
even close to that.)
-hpa
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