Author: Eugene Nalimov
Date: 11:56:38 05/03/99
Go up one level in this thread
On May 03, 1999 at 14:47:20, James Robertson wrote: >On May 03, 1999 at 14:40:18, Ian Kennedy wrote: > >>On May 03, 1999 at 12:58:39, James Robertson wrote: >> >>>On May 03, 1999 at 03:09:32, Jouni Uski wrote: >>> >>>>I have compared Crafty 16.6 and Fritz5.32 in P90 and Celeron 300 PCs. Here is >>>>average NPS: >>>> >>>> P90 Cel 300 speed-up >>>> Fritz 5.32 88 kn/s 288 kn/s 3.3 x >>>> Crafty 16.6 20 kn/s 175 kn/s 8.8 x !! >>> >>>I think it is due to the bitboards. The newer chips have much better machine >>>operations (bsf, bsr) to do 64-bit math, so Crafty will have a much better time >>>on the newer machine. >>> >>>James >> >>Not quite sure what you're saying here since bsr and bsf have been around since >>the 386, do you mean they have been improved in some way? >> >>Ian Kennedy > >I think bsf/bsr are faster on a PII/PPro than on a plain Pentium. > >James bsr/bsf instructions can use up to 70 CPU ticks at the older Pentiums (bsf r32,r32 - 6-43; bsr r32,r32 - 7-71). With newer Intel processors you can use them - they converts into 4 ROPs (I don’t know about AMD/ Cyrix/IDT processors). Eugene
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