#ifndef BITBOARD_H_INCLUDED
#define BITBOARD_H_INCLUDED
+#include <string>
+
#include "types.h"
namespace Bitboards {
const Bitboard Rank7BB = Rank1BB << (8 * 6);
const Bitboard Rank8BB = Rank1BB << (8 * 7);
-CACHE_LINE_ALIGNMENT
-
extern Bitboard RMasks[SQUARE_NB];
extern Bitboard RMagics[SQUARE_NB];
extern Bitboard* RAttacks[SQUARE_NB];
return b & (b - 1);
}
-inline int square_distance(Square s1, Square s2) {
- return SquareDistance[s1][s2];
-}
+template<typename T> inline int distance(T x, T y) { return x < y ? y - x : x - y; }
+template<> inline int distance<Square>(Square x, Square y) { return SquareDistance[x][y]; }
-inline int file_distance(Square s1, Square s2) {
- return abs(file_of(s1) - file_of(s2));
-}
-
-inline int rank_distance(Square s1, Square s2) {
- return abs(rank_of(s1) - rank_of(s2));
-}
+template<typename T1, typename T2> inline int distance(T2 x, T2 y);
+template<> inline int distance<File>(Square x, Square y) { return distance(file_of(x), file_of(y)); }
+template<> inline int distance<Rank>(Square x, Square y) { return distance(rank_of(x), rank_of(y)); }
/// shift_bb() moves bitboard one step along direction Delta. Mainly for pawns.
Bitboard* const Magics = Pt == ROOK ? RMagics : BMagics;
unsigned* const Shifts = Pt == ROOK ? RShifts : BShifts;
+ if (HasPext)
+ return unsigned(_pext_u64(occ, Masks[s]));
+
if (Is64Bit)
return unsigned(((occ & Masks[s]) * Magics[s]) >> Shifts[s]);
return (Pt == ROOK ? RAttacks : BAttacks)[s][magic_index<Pt>(s, occ)];
}
-inline Bitboard attacks_bb(Piece p, Square s, Bitboard occ) {
+inline Bitboard attacks_bb(Piece pc, Square s, Bitboard occ) {
- switch (type_of(p))
+ switch (type_of(pc))
{
case BISHOP: return attacks_bb<BISHOP>(s, occ);
case ROOK : return attacks_bb<ROOK>(s, occ);
case QUEEN : return attacks_bb<BISHOP>(s, occ) | attacks_bb<ROOK>(s, occ);
- default : return StepAttacksBB[p][s];
+ default : return StepAttacksBB[pc][s];
}
}
# if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
FORCE_INLINE Square lsb(Bitboard b) {
- unsigned long index;
- _BitScanForward64(&index, b);
- return (Square) index;
+ unsigned long idx;
+ _BitScanForward64(&idx, b);
+ return (Square) idx;
}
FORCE_INLINE Square msb(Bitboard b) {
- unsigned long index;
- _BitScanReverse64(&index, b);
- return (Square) index;
+ unsigned long idx;
+ _BitScanReverse64(&idx, b);
+ return (Square) idx;
}
# elif defined(__arm__)
# else
FORCE_INLINE Square lsb(Bitboard b) { // Assembly code by Heinz van Saanen
- Bitboard index;
- __asm__("bsfq %1, %0": "=r"(index): "rm"(b) );
- return (Square) index;
+ Bitboard idx;
+ __asm__("bsfq %1, %0": "=r"(idx): "rm"(b) );
+ return (Square) idx;
}
FORCE_INLINE Square msb(Bitboard b) {
- Bitboard index;
- __asm__("bsrq %1, %0": "=r"(index): "rm"(b) );
- return (Square) index;
+ Bitboard idx;
+ __asm__("bsrq %1, %0": "=r"(idx): "rm"(b) );
+ return (Square) idx;
}
# endif