Author: Ernst A. Heinz
Date: 03:03:08 06/08/98
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On June 05, 1998 at 21:48:57, Robert Hyatt wrote: >On June 05, 1998 at 17:47:07, Bruce Moreland wrote: > >> >>On June 05, 1998 at 08:53:53, Ernst A. Heinz wrote: >> >>>BTW, we have been waiting to get our hands on a Alpha-21264 for roughly >>>a year because "DarkThought" will hopefully speed up as much on them >>>as "Crafty". >> >>What percentage of execution time do you and Bob spend doing these >>operations, do you think? >> >>bruce > >FindFirstOne() = 1-2% in crafty. popcnt is much less... so that won't >help a whole lot. but the 64 bit stuff helps in general... The greatest speedup I expect is not related to the "bean-counting" :-) execution time spent on the operations. Instead, our code will gain a lot in terms of simplicity w.r.t. to possible optimizations. Example: There are many loops over bitboards which need a function call to find the next bit prior to each iteration. Right now, these function calls never get inlined but with find-bit instructions they will thus opening the road for further optimizations ... =Ernst=
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