Author: Daniel Clausen
Date: 05:49:32 07/22/04
Go up one level in this thread
On July 22, 2004 at 08:38:48, Gerd Isenberg wrote: [snip] >Another similar shuffling sequence, one instruction less and therefore slightly >faster with appropriate scheduling of independent initialization instructions. >It may be used with passed bitboard already in xmm0: > > movq xmm0, [bb] ; 0x0000000000000000:0xf0e1d2c3b4a59687 > punpcklbw xmm0, xmm0 ; 0xf0f0e1e1d2d2c3c3:0xb4b4a5a596968787 > movdqa xmm2, xmm0 > punpcklwd xmm0, xmm0 ; 0xb4b4b4b4a5a5a5a5:0x9696969687878787 > punpckhwd xmm2, xmm2 ; 0xf0f0f0f0e1e1e1e1:0xd2d2d2d2c3c3c3c3 > movdqa xmm1, xmm0 > movdqa xmm3, xmm2 > punpckldq xmm0, xmm0 ; 0x9696969696969696:0x8787878787878787 > punpckhdq xmm1, xmm1 ; 0xb4b4b4b4b4b4b4b4:0xa5a5a5a5a5a5a5a5 > punpckldq xmm2, xmm2 ; 0xd2d2d2d2d2d2d2d2:0xc3c3c3c3c3c3c3c3 > punpckhdq xmm3, xmm3 ; 0xf0f0f0f0f0f0f0f0:0xe1e1e1e1e1e1e1e1 > >The Unpack and Interleave instructions became familar now ;-) >Anyway i'm not quite sure whether to take this additional overhead or to stay >with the rotated weights. > > movq xmm0, [bb] ; 0x0000000000000000:0xf0e1d2c3b4a59687 > punpcklqdq xmm0, xmm0 ; 0xf0e1d2c3b4a59687:0xf0e1d2c3b4a59687 > movdqa xmm1, xmm0 ; 0xf0e1d2c3b4a59687:0xf0e1d2c3b4a59687 > movdqa xmm2, xmm0 ; 0xf0e1d2c3b4a59687:0xf0e1d2c3b4a59687 > movdqa xmm3, xmm0 ; 0xf0e1d2c3b4a59687:0xf0e1d2c3b4a59687 > >Rotating a square index here and there is not that expensive... >I plan most weights already precomputed and probably indexed by some >(king)squares and side. > >Gerd I just wanted to remind you guys that the goal of the game is to checkmate your opponent. With all these hex-numbers and asm instructions it's easy to lose track. ;) Sargon
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