Author: Robert Hyatt
Date: 07:44:25 10/31/98
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On October 31, 1998 at 07:27:43, Bo Persson wrote: >On October 29, 1998 at 13:20:45, Roberto Waldteufel wrote: >[snip] >>Of course, once I started using assembler on the intel CPU, the bsf and bsr >>instructions were a god-send and I stopped all this nonsense with modular >>arithmetic....:-) >> >>Best wishes, >>Roberto > >I thought these instructions were microcoded and extremely slow on anything >newer than a 386! When testing on a Pentium, a table lookup was actually much >faster for me. > > >Bo Persson >bop@malmo.mail.telia.com ditto here. But I only tested this on a P5 (non-mmx) when I started doing this stuff. the instructions were grossly slow. Someone even tried some hand-coded stuff to help and it was still slower than what I do at present (table lookup).
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