#include "types.h"
+CACHE_LINE_ALIGNMENT
+
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];
extern Bitboard PseudoAttacks[6][64];
-/// Functions for testing whether a given bit is set in a bitboard, and for
-/// setting and clearing bits.
+/// 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 Bitboard bit_is_set(Bitboard b, Square s) {
+inline Bitboard operator&(Bitboard b, Square s) {
return b & SquareBB[s];
}
-inline void set_bit(Bitboard* b, Square s) {
- *b |= SquareBB[s];
-}
-
-inline void xor_bit(Bitboard* b, Square s) {
- *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 SquareBB[from] | SquareBB[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;
}
#else // if !defined(IS_64BIT)
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];
+ unsigned lo = unsigned(occ) & unsigned(RMasks[s]);
+ unsigned hi = unsigned(occ >> 32) & unsigned(RMasks[s] >> 32);
+ return (lo * unsigned(RMagics[s]) ^ hi * unsigned(RMagics[s] >> 32)) >> RShifts[s];
}
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];
+ unsigned lo = unsigned(occ) & unsigned(BMasks[s]);
+ unsigned hi = unsigned(occ >> 32) & unsigned(BMasks[s] >> 32);
+ return (lo * unsigned(BMagics[s]) ^ hi * unsigned(BMagics[s] >> 32)) >> BShifts[s];
}
#endif
/// 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;
}