One big difference of the P4 is the SSE2 instructions and
registers. It's now reasonable to ignore the old floating point
stack altogether, and do floating point work with the SSE
register file, getting the SIMD speed up where that's useful.
(Because sse can now do doubles as well as floats.)
However that depends on the OS doing the appropriate saves on
the SSE register file on context switches. Do we do that (yet)?
--
Andrew
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