Author: Gian-Carlo Pascutto
Date: 11:17:42 11/19/02
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On November 19, 2002 at 14:11:18, Robert Hyatt wrote: >On November 19, 2002 at 12:25:11, Gian-Carlo Pascutto wrote: > >>On November 19, 2002 at 11:35:24, Robert Hyatt wrote: >> >>>Bitboards have a bit of a performance advantage on 64 bit processors, >> >>Proof? >> >>-- >>GCP > >Counter-proof? > >Seems intuitively obvious to me. It seems intuitively obvious to Vincent that bitboards suck, but I believe neither of you. >Bitmaps seem to suffer _no_ performance penalty on >X86 with 32 bits, compared to 0x88. How do you determine this? >Seems intuitively obvious to me that they will pick >up speed on a machine that does 64 bit operations. Not so obvious to me, I've posted a few issues with it here before. >Bruce and I did this comparison when he used the alpha in the WMCCC (1997 I >think). > >He re-compiled ferret for the alpha, did the same for Crafty. My speed >improvement was >significantly better than his on the _same_ machine. Because of the 64 bit >stuff. His program didn't need any 64 bit stuff so it was wasted... Doesn't say a thing. The programs are much more different than just bitboard vs nonbitboard. -- GCP
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