Author: Jeremiah Penery
Date: 02:41:00 04/19/00
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On April 18, 2000 at 22:44:25, Flemming Rodler wrote: >Hi, > >I am trying to implement a bitboard based chess program on a Pentium or AMD >computer. I need to be able to find the following information fast: >2) Count the number of bits that are 1 in a sequence of 64 bits. On some architectures (Alpha, for example), PopCnt is a hardware instruction. It will count the 1 bits in an int (or whatever). On a P6 (PII/PIII/Celeron), I think you could make use of the BSF/BSR instructions to do this counting. It might end up being really slow anyway, and may be difficult to implement. But I'm not going to worry about that part. :) Jeremiah
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