Author: Dan Newman
Date: 00:37:59 04/19/00
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I should add that BSF and BSR are extremely fast on P6's, PII's, PIII's, Celerons, and the like, and beat out any C code that I've come up with, but are extremely slow on older processors. I don't remember exactly at what point this change occurred, but I suspect that it came with the P6 and that plain Pentiums do these slowly--but I really don't know. I don't know how they do on the various AMD's either... -Dan.
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