// Global bitboards definitions with static storage duration are
// automatically set to zero before enter main().
-Bitboard RAttacks[0x19000];
-Bitboard BAttacks[0x1480];
-
Magics RMagics[64];
Magics BMagics[64];
namespace {
+ CACHE_LINE_ALIGNMENT
+
+ int BSFTable[64];
+
+ Bitboard RAttacks[0x19000];
+ Bitboard BAttacks[0x1480];
+
+ void init_sliding_attacks(Bitboard attacks[], Magics m[], const Bitboard mult[], Square deltas[]);
+
#if defined(IS_64BIT)
const uint64_t DeBruijnMagic = 0x218A392CD3D5DBFULL;
#endif // defined(IS_64BIT)
- CACHE_LINE_ALIGNMENT int BSFTable[64];
-
- void init_sliding_attacks(Bitboard attacks[], Magics m[], const Bitboard mult[], Square deltas[]);
}
{
excluded = ((Rank1BB | Rank8BB) & ~rank_bb(s)) | ((FileABB | FileHBB) & ~file_bb(s));
- m[s].offset = offset;
- m[s].mult = mult[s];
- m[s].mask = sliding_attacks(s, EmptyBoardBB, deltas, excluded);
- m[s].shift = (CpuIs64Bit ? 64 : 32) - count_1s<CNT64>(m[s].mask);
+ m[s].attacks = &attacks[offset];
+ m[s].mult = mult[s];
+ m[s].mask = sliding_attacks(s, EmptyBoardBB, deltas, excluded);
+ m[s].shift = (CpuIs64Bit ? 64 : 32) - count_1s<CNT64>(m[s].mask);
maxKey = 1 << count_1s<CNT64>(m[s].mask);
index = CpuIs64Bit ? occupancy * mult[s]
: unsigned(occupancy * mult[s] ^ (occupancy >> 32) * (mult[s] >> 32));
- attacks[offset + (index >> m[s].shift)] = sliding_attacks(s, occupancy, deltas, EmptyBoardBB);
+ m[s].attacks[index >> m[s].shift] = sliding_attacks(s, occupancy, deltas, EmptyBoardBB);
}
offset += maxKey;
}
struct Magics {
Bitboard mask;
uint64_t mult;
- uint32_t offset;
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.offset + (((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.offset + (((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.offset +
- ((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.offset +
- ((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