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Try to keep memory access in the same cache line

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-06-04 16:36:52 +01:00
parent 3b2bcee0a8
commit 2f6142cb9b
2 changed files with 74 additions and 72 deletions
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55
src/bitboard.h
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@@ -60,24 +60,25 @@ extern Bitboard SquaresInFrontMask[2][64];
extern Bitboard PassedPawnMask[2][64];
extern Bitboard AttackSpanMask[2][64];
extern const uint64_t RMult[64];
extern const int RShift[64];
extern Bitboard RMask[64];
extern int RAttackIndex[64];
extern Bitboard RAttacks[0x19000];
extern const uint64_t BMult[64];
extern const int BShift[64];
extern Bitboard BMask[64];
extern int BAttackIndex[64];
extern Bitboard BAttacks[0x1480];
extern Bitboard BishopPseudoAttacks[64];
extern Bitboard RookPseudoAttacks[64];
extern Bitboard QueenPseudoAttacks[64];
extern uint8_t BitCount8Bit[256];
struct Magics {
Bitboard mask;
uint64_t mult;
uint32_t index;
uint32_t shift;
};
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.
@@ -173,28 +174,30 @@ inline Bitboard in_front_bb(Color c, Square s) {
#if defined(IS_64BIT)
inline Bitboard rook_attacks_bb(Square s, Bitboard blockers) {
Bitboard b = blockers & RMask[s];
return RAttacks[RAttackIndex[s] + ((b * RMult[s]) >> RShift[s])];
inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
const Magics& m = RMagics[s];
return RAttacks[m.index + (((occ & m.mask) * m.mult) >> m.shift)];
}
inline Bitboard bishop_attacks_bb(Square s, Bitboard blockers) {
Bitboard b = blockers & BMask[s];
return BAttacks[BAttackIndex[s] + ((b * BMult[s]) >> BShift[s])];
inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) {
const Magics& m = BMagics[s];
return BAttacks[m.index + (((occ & m.mask) * m.mult) >> m.shift)];
}
#else // if !defined(IS_64BIT)
inline Bitboard rook_attacks_bb(Square s, Bitboard blockers) {
Bitboard b = blockers & RMask[s];
return RAttacks[RAttackIndex[s] +
(unsigned(int(b) * int(RMult[s]) ^ int(b >> 32) * int(RMult[s] >> 32)) >> RShift[s])];
inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
const Magics& m = RMagics[s];
Bitboard b = occ & m.mask;
return RAttacks[m.index +
((unsigned(b) * unsigned(m.mult) ^ unsigned(b >> 32) * unsigned(m.mult >> 32)) >> m.shift)];
}
inline Bitboard bishop_attacks_bb(Square s, Bitboard blockers) {
Bitboard b = blockers & BMask[s];
return BAttacks[BAttackIndex[s] +
(unsigned(int(b) * int(BMult[s]) ^ int(b >> 32) * int(BMult[s] >> 32)) >> BShift[s])];
inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) {
const Magics& m = BMagics[s];
Bitboard b = occ & m.mask;
return BAttacks[m.index +
((unsigned(b) * unsigned(m.mult) ^ unsigned(b >> 32) * unsigned(m.mult >> 32)) >> m.shift)];
}
#endif