#include "types.h"
+CACHE_LINE_ALIGNMENT
+
+extern Bitboard RMasks[64];
+extern Bitboard RMagics[64];
+extern Bitboard* RAttacks[64];
+extern int RShifts[64];
+
+extern Bitboard BMasks[64];
+extern Bitboard BMagics[64];
+extern Bitboard* BAttacks[64];
+extern int BShifts[64];
+
+extern Bitboard SquareBB[64];
extern Bitboard FileBB[8];
+extern Bitboard RankBB[8];
extern Bitboard AdjacentFilesBB[8];
extern Bitboard ThisAndAdjacentFilesBB[8];
-extern Bitboard RankBB[8];
extern Bitboard InFrontBB[2][8];
-
-extern Bitboard SetMaskBB[65];
-extern Bitboard ClearMaskBB[65];
-
extern Bitboard StepAttacksBB[16][64];
extern Bitboard BetweenBB[64][64];
-
extern Bitboard SquaresInFrontMask[2][64];
extern Bitboard PassedPawnMask[2][64];
extern Bitboard AttackSpanMask[2][64];
-
-extern uint64_t RMagics[64];
-extern int RShifts[64];
-extern Bitboard RMasks[64];
-extern Bitboard* RAttacks[64];
-
-extern uint64_t BMagics[64];
-extern int BShifts[64];
-extern Bitboard BMasks[64];
-extern Bitboard* BAttacks[64];
-
extern Bitboard PseudoAttacks[6][64];
-extern uint8_t BitCount8Bit[256];
-
-
-/// Functions for testing whether a given bit is set in a bitboard, and for
-/// setting and clearing bits.
-inline Bitboard bit_is_set(Bitboard b, Square s) {
- return b & SetMaskBB[s];
-}
-
-inline void set_bit(Bitboard* b, Square s) {
- *b |= SetMaskBB[s];
-}
+/// Overloads of bitwise operators between a Bitboard and a Square for testing
+/// whether a given bit is set in a bitboard, and for setting and clearing bits.
-inline void clear_bit(Bitboard* b, Square s) {
- *b &= ClearMaskBB[s];
+inline Bitboard operator&(Bitboard b, Square s) {
+ return b & SquareBB[s];
}
-
-/// Functions used to update a bitboard after a move. This is faster
-/// then calling a sequence of clear_bit() + set_bit()
-
-inline Bitboard make_move_bb(Square from, Square to) {
- return SetMaskBB[from] | SetMaskBB[to];
+inline Bitboard& operator|=(Bitboard& b, Square s) {
+ return b |= SquareBB[s], b;
}
-inline void do_move_bb(Bitboard* b, Bitboard move_bb) {
- *b ^= move_bb;
+inline Bitboard& operator^=(Bitboard& b, Square s) {
+ return b ^= SquareBB[s], b;
}
#if defined(IS_64BIT)
-FORCE_INLINE unsigned rook_index(Square s, Bitboard occ) {
+FORCE_INLINE unsigned r_index(Square s, Bitboard occ) {
return unsigned(((occ & RMasks[s]) * RMagics[s]) >> RShifts[s]);
}
-FORCE_INLINE unsigned bishop_index(Square s, Bitboard occ) {
+FORCE_INLINE unsigned b_index(Square s, Bitboard occ) {
return unsigned(((occ & BMasks[s]) * BMagics[s]) >> BShifts[s]);
}
#else // if !defined(IS_64BIT)
-FORCE_INLINE unsigned rook_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];
}
-FORCE_INLINE unsigned bishop_index(Square s, Bitboard occ) {
+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
inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
- return RAttacks[s][rook_index(s, occ)];
+ return RAttacks[s][r_index(s, occ)];
}
inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) {
- return BAttacks[s][bishop_index(s, occ)];
-}
-
-inline Bitboard queen_attacks_bb(Square s, Bitboard blockers) {
- return rook_attacks_bb(s, blockers) | bishop_attacks_bb(s, blockers);
+ return BAttacks[s][b_index(s, occ)];
}
inline bool squares_aligned(Square s1, Square s2, Square s3) {
return (BetweenBB[s1][s2] | BetweenBB[s1][s3] | BetweenBB[s2][s3])
- & ( SetMaskBB[s1] | SetMaskBB[s2] | SetMaskBB[s3]);
+ & ( SquareBB[s1] | SquareBB[s2] | SquareBB[s3]);
}
/// the same color of the given square.
inline Bitboard same_color_squares(Square s) {
- return bit_is_set(0xAA55AA55AA55AA55ULL, s) ? 0xAA55AA55AA55AA55ULL
- : ~0xAA55AA55AA55AA55ULL;
+ return Bitboard(0xAA55AA55AA55AA55ULL) & s ? 0xAA55AA55AA55AA55ULL
+ : ~0xAA55AA55AA55AA55ULL;
}