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https://github.com/sockspls/badfish
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Use a const pointer-to-member array for attacks
Allow the compiler to optimize member function access. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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4 changed files with 10 additions and 15 deletions
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@ -52,7 +52,6 @@ int main(int argc, char *argv[]) {
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// Initialization
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// Initialization
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init_piece_attacks_fn();
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init_mersenne();
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init_mersenne();
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init_direction_table();
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init_direction_table();
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init_bitboards();
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init_bitboards();
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@ -1004,9 +1004,10 @@ namespace {
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int generate_piece_moves(PieceType piece, const Position &pos, MoveStack *mlist,
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int generate_piece_moves(PieceType piece, const Position &pos, MoveStack *mlist,
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Color side, Bitboard target) {
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Color side, Bitboard target) {
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const Piece_attacks_fn mem_fn = piece_attacks_fn[piece];
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Square from, to;
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Square from, to;
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Bitboard b;
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Bitboard b;
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Piece_attacks_fn mem_fn = piece_attacks_fn[piece];
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int n = 0;
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int n = 0;
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for (int i = 0; i < pos.piece_count(side, piece); i++)
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for (int i = 0; i < pos.piece_count(side, piece); i++)
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@ -1095,5 +1096,4 @@ namespace {
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return n;
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return n;
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}
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}
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}
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}
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@ -48,21 +48,18 @@ Key Position::zobSideToMove;
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Value Position::MgPieceSquareTable[16][64];
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Value Position::MgPieceSquareTable[16][64];
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Value Position::EgPieceSquareTable[16][64];
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Value Position::EgPieceSquareTable[16][64];
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Piece_attacks_fn piece_attacks_fn[7];
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const Piece_attacks_fn piece_attacks_fn[] =
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{ 0, 0,
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&Position::knight_attacks,
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&Position::bishop_attacks,
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&Position::rook_attacks,
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&Position::queen_attacks,
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&Position::king_attacks };
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////
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////
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//// Functions
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//// Functions
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////
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////
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void init_piece_attacks_fn() {
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piece_attacks_fn[KNIGHT] = &Position::knight_attacks;
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piece_attacks_fn[BISHOP] = &Position::bishop_attacks;
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piece_attacks_fn[ROOK] = &Position::rook_attacks;
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piece_attacks_fn[QUEEN] = &Position::queen_attacks;
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piece_attacks_fn[KING] = &Position::king_attacks;
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}
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/// Constructors
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/// Constructors
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Position::Position(const Position &pos) {
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Position::Position(const Position &pos) {
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@ -372,8 +372,7 @@ private:
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/// An array of member functions to dispatch attacks_square
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/// An array of member functions to dispatch attacks_square
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typedef Bitboard (Position::* Piece_attacks_fn)(Square s) const;
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typedef Bitboard (Position::* Piece_attacks_fn)(Square s) const;
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extern Piece_attacks_fn piece_attacks_fn[7];
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extern const Piece_attacks_fn piece_attacks_fn[];
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extern void init_piece_attacks_fn();
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////
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////
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//// Inline functions
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//// Inline functions
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