struct Magics {
Bitboard mask;
uint64_t mult;
- uint32_t index;
uint32_t shift;
+ Bitboard* attacks;
};
extern Magics RMagics[64];
extern Magics BMagics[64];
-extern Bitboard RAttacks[0x19000];
-extern Bitboard BAttacks[0x1480];
-
/// Functions for testing whether a given bit is set in a bitboard, and for
/// setting and clearing bits.
inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
const Magics& m = RMagics[s];
- return RAttacks[m.index + (((occ & m.mask) * m.mult) >> m.shift)];
+ return m.attacks[((occ & m.mask) * m.mult) >> m.shift];
}
inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) {
const Magics& m = BMagics[s];
- return BAttacks[m.index + (((occ & m.mask) * m.mult) >> m.shift)];
+ return m.attacks[((occ & m.mask) * m.mult) >> m.shift];
}
#else // if !defined(IS_64BIT)
inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
const Magics& m = RMagics[s];
Bitboard b = occ & m.mask;
- return RAttacks[m.index +
- ((unsigned(b) * unsigned(m.mult) ^ unsigned(b >> 32) * unsigned(m.mult >> 32)) >> m.shift)];
+ return m.attacks[(unsigned(b) * unsigned(m.mult) ^ unsigned(b >> 32) * unsigned(m.mult >> 32)) >> m.shift];
}
inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) {
const Magics& m = BMagics[s];
Bitboard b = occ & m.mask;
- return BAttacks[m.index +
- ((unsigned(b) * unsigned(m.mult) ^ unsigned(b >> 32) * unsigned(m.mult >> 32)) >> m.shift)];
+ return m.attacks[(unsigned(b) * unsigned(m.mult) ^ unsigned(b >> 32) * unsigned(m.mult >> 32)) >> m.shift];
}
#endif