Author: Gerd Isenberg
Date: 15:52:11 10/22/02
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On October 22, 2002 at 18:47:54, Gerd Isenberg wrote: >one possible improvement :-) > >I would guess this reduces dependencies and may shlightly or microscopic faster: > >bitboard WhitePawnAttacks (bitboard b) >{ > bitboard c = b; > b ^= b; // b ^= c has to wait for the previous instruction > b |= (c << 7) & 0x7F7F7F7F7F7F7F7F; > b |= (c << 9) & 0xFEFEFEFEFEFEFEFE; > return b; >} > >Gerd Or of course: bitboard WhitePawnAttacks (bitboard b) { bitboard c = b; b = (c << 7) & 0x7F7F7F7F7F7F7F7F; b |= (c << 9) & 0xFEFEFEFEFEFEFEFE; return b; }
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