extern Bitboard RMasks[64];
extern Bitboard RMagics[64];
extern Bitboard* RAttacks[64];
-extern int RShifts[64];
+extern unsigned RShifts[64];
extern Bitboard BMasks[64];
extern Bitboard BMagics[64];
extern Bitboard* BAttacks[64];
-extern int BShifts[64];
+extern unsigned BShifts[64];
extern Bitboard SquareBB[64];
extern Bitboard FileBB[8];
}
inline Bitboard& operator|=(Bitboard& b, Square s) {
- return b |= SquareBB[s], b;
+ return b |= SquareBB[s];
}
inline Bitboard& operator^=(Bitboard& b, Square s) {
- return b ^= SquareBB[s], b;
+ return b ^= SquareBB[s];
+}
+
+inline Bitboard operator|(Bitboard b, Square s) {
+ return b | SquareBB[s];
+}
+
+inline Bitboard operator^(Bitboard b, Square s) {
+ return b ^ SquareBB[s];
}
}
-/// Functions for computing sliding attack bitboards. rook_attacks_bb(),
-/// bishop_attacks_bb() and queen_attacks_bb() all take a square and a
-/// bitboard of occupied squares as input, and return a bitboard representing
-/// all squares attacked by a rook, bishop or queen on the given square.
-
-#if defined(IS_64BIT)
-
-FORCE_INLINE unsigned r_index(Square s, Bitboard occ) {
- return unsigned(((occ & RMasks[s]) * RMagics[s]) >> RShifts[s]);
-}
-
-FORCE_INLINE unsigned b_index(Square s, Bitboard occ) {
- return unsigned(((occ & BMasks[s]) * BMagics[s]) >> BShifts[s]);
-}
-
-#else // if !defined(IS_64BIT)
+/// Functions for computing sliding attack bitboards. Function attacks_bb() takes
+/// a square and a bitboard of occupied squares as input, and returns a bitboard
+/// representing all squares attacked by Pt (bishop or rook) on the given square.
+template<PieceType Pt>
+FORCE_INLINE unsigned magic_index(Square s, Bitboard occ) {
-FORCE_INLINE unsigned r_index(Square s, Bitboard occ) {
- Bitboard b = occ & RMasks[s];
- return unsigned(int(b) * int(RMagics[s]) ^ int(b >> 32) * int(RMagics[s] >> 32)) >> RShifts[s];
-}
+ Bitboard* const Masks = Pt == ROOK ? RMasks : BMasks;
+ Bitboard* const Magics = Pt == ROOK ? RMagics : BMagics;
+ unsigned* const Shifts = Pt == ROOK ? RShifts : BShifts;
-FORCE_INLINE unsigned b_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
+ if (Is64Bit)
+ return unsigned(((occ & Masks[s]) * Magics[s]) >> Shifts[s]);
-inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
- return RAttacks[s][r_index(s, occ)];
+ unsigned lo = unsigned(occ) & unsigned(Masks[s]);
+ unsigned hi = unsigned(occ >> 32) & unsigned(Masks[s] >> 32);
+ return (lo * unsigned(Magics[s]) ^ hi * unsigned(Magics[s] >> 32)) >> Shifts[s];
}
-inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) {
- return BAttacks[s][b_index(s, occ)];
+template<PieceType Pt>
+inline Bitboard attacks_bb(Square s, Bitboard occ) {
+ Bitboard** const Attacks = Pt == ROOK ? RAttacks : BAttacks;
+ return Attacks[s][magic_index<Pt>(s, occ)];
}