Author: Anthony Cozzie
Date: 07:59:05 07/19/04
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On July 18, 2004 at 15:33:33, Gerd Isenberg wrote: > >>I am guessing something like 50 cycles? Really not that bad . . . probably >>close to the speed of a scan over attack tables. >> >>anthony > >14.45ns on a 2.2GHz Athlon64, ~32 cycles now. > >Some minor changes, byte vector values (weights) 0..63, therefore only one >psadbw, no movd but two pextrw, final add with gp. Computed bit masks in two >xmm-registers (0x02:0x01). Some better instruction scheduling. > >Gerd If you would ship me the new code I would be much obliged (acozzie@verizon.net). I am concentrating on parallel code right now, but once that is done I am going to do some serious work on my eval. I want to prove Vincent wrong that a good eval cannot be done with bitboards :) 32 cycles is _really_ good. I think that on average rotated bitboard attack generation is 20 cycles, so that is 50 cycles / piece / mobility = 500 cycles (~250 ns on my computer) for all pieces, which is really not bad. In fact, 32 cycles is not that much slower than popcount! anthony
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