HCha/Stockfish
1
0
Fork 0
mirror of https://github.com/HChaZZY/Stockfish.git synced 2025-12-22 18:17:02 +08:00
Code Issues Packages Projects Releases Wiki Activity

Further touches to magic bitboards code

Browse Source 
No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-11-01 09:07:23 +01:00
parent ac7339877b
commit 22b9307aba
2 changed files with 52 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
src/bitboard.h
View File

@@ -171,30 +171,35 @@ inline Bitboard in_front_bb(Color c, Square s) {
#if defined(IS_64BIT)
inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
return RAttacks[s][((occ & RMasks[s]) * RMagics[s]) >> RShifts[s]];
FORCE_INLINE unsigned rook_index(Square s, Bitboard occ) {
return unsigned(((occ & RMasks[s]) * RMagics[s]) >> RShifts[s]);
}
inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) {
return BAttacks[s][((occ & BMasks[s]) * BMagics[s]) >> BShifts[s]];
FORCE_INLINE unsigned bishop_index(Square s, Bitboard occ) {
return unsigned(((occ & BMasks[s]) * BMagics[s]) >> BShifts[s]);
}
#else // if !defined(IS_64BIT)
inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
FORCE_INLINE unsigned rook_index(Square s, Bitboard occ) {
Bitboard b = occ & RMasks[s];
return RAttacks[s]
[unsigned(int(b) * int(RMagics[s]) ^ int(b >> 32) * int(RMagics[s] >> 32)) >> RShifts[s]];
return unsigned(int(b) * int(RMagics[s]) ^ int(b >> 32) * int(RMagics[s] >> 32)) >> RShifts[s];
}
FORCE_INLINE unsigned bishop_index(Square s, Bitboard occ) {
Bitboard b = occ & BMasks[s];
return unsigned(int(b) * int(BMagics[s]) ^ int(b >> 32) * int(BMagics[s] >> 32)) >> BShifts[s];
}
#endif
inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
return RAttacks[s][rook_index(s, occ)];
}
inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) {
Bitboard b = occ & BMasks[s];
return BAttacks[s]
[unsigned(int(b) * int(BMagics[s]) ^ int(b >> 32) * int(BMagics[s] >> 32)) >> BShifts[s]];
return BAttacks[s][bishop_index(s, occ)];
}
#endif
inline Bitboard queen_attacks_bb(Square s, Bitboard blockers) {
return rook_attacks_bb(s, blockers) | bishop_attacks_bb(s, blockers);
}