Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
- Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+ Copyright (C) 2015-2017 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
/// any normal move destination square is always different from origin square
/// while MOVE_NONE and MOVE_NULL have the same origin and destination square.
-enum Move {
+enum Move : int {
MOVE_NONE,
MOVE_NULL = 65
};
PIECE_NB = 16
};
-enum Depth {
+const Piece Pieces[] = { W_PAWN, W_KNIGHT, W_BISHOP, W_ROOK, W_QUEEN, W_KING,
+ B_PAWN, B_KNIGHT, B_BISHOP, B_ROOK, B_QUEEN, B_KING };
+extern Value PieceValue[PHASE_NB][PIECE_NB];
+
+enum Depth : int {
ONE_PLY = 1,
SQUARE_NB = 64,
- DELTA_N = 8,
- DELTA_E = 1,
- DELTA_S = -8,
- DELTA_W = -1,
-
- DELTA_NN = DELTA_N + DELTA_N,
- DELTA_NE = DELTA_N + DELTA_E,
- DELTA_SE = DELTA_S + DELTA_E,
- DELTA_SS = DELTA_S + DELTA_S,
- DELTA_SW = DELTA_S + DELTA_W,
- DELTA_NW = DELTA_N + DELTA_W
+ NORTH = 8,
+ EAST = 1,
+ SOUTH = -8,
+ WEST = -1,
+
+ NORTH_EAST = NORTH + EAST,
+ SOUTH_EAST = SOUTH + EAST,
+ SOUTH_WEST = SOUTH + WEST,
+ NORTH_WEST = NORTH + WEST
};
-enum File {
+enum File : int {
FILE_A, FILE_B, FILE_C, FILE_D, FILE_E, FILE_F, FILE_G, FILE_H, FILE_NB
};
-enum Rank {
+enum Rank : int {
RANK_1, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8, RANK_NB
};
/// Score enum stores a middlegame and an endgame value in a single integer
/// (enum). The least significant 16 bits are used to store the endgame value
-/// and the upper 16 bits are used to store the middlegame value.
+/// and the upper 16 bits are used to store the middlegame value. Take some
+/// care to avoid left-shifting a signed int to avoid undefined behavior.
enum Score : int { SCORE_ZERO };
inline Score make_score(int mg, int eg) {
- return Score((mg << 16) + eg);
+ return Score((int)((unsigned int)eg << 16) + mg);
}
/// Extracting the signed lower and upper 16 bits is not so trivial because
/// according to the standard a simple cast to short is implementation defined
/// and so is a right shift of a signed integer.
-inline Value mg_value(Score s) {
+inline Value eg_value(Score s) {
- union { uint16_t u; int16_t s; } mg = { uint16_t(unsigned(s + 0x8000) >> 16) };
- return Value(mg.s);
+ union { uint16_t u; int16_t s; } eg = { uint16_t(unsigned(s + 0x8000) >> 16) };
+ return Value(eg.s);
}
-inline Value eg_value(Score s) {
+inline Value mg_value(Score s) {
- union { uint16_t u; int16_t s; } eg = { uint16_t(unsigned(s)) };
- return Value(eg.s);
+ union { uint16_t u; int16_t s; } mg = { uint16_t(unsigned(s)) };
+ return Value(mg.s);
}
#define ENABLE_BASE_OPERATORS_ON(T) \
inline T operator+(T d1, T d2) { return T(int(d1) + int(d2)); } \
inline T operator-(T d1, T d2) { return T(int(d1) - int(d2)); } \
-inline T operator*(int i, T d) { return T(i * int(d)); } \
-inline T operator*(T d, int i) { return T(int(d) * i); } \
inline T operator-(T d) { return T(-int(d)); } \
inline T& operator+=(T& d1, T d2) { return d1 = d1 + d2; } \
inline T& operator-=(T& d1, T d2) { return d1 = d1 - d2; } \
-inline T& operator*=(T& d, int i) { return d = T(int(d) * i); }
#define ENABLE_FULL_OPERATORS_ON(T) \
ENABLE_BASE_OPERATORS_ON(T) \
+inline T operator*(int i, T d) { return T(i * int(d)); } \
+inline T operator*(T d, int i) { return T(int(d) * i); } \
inline T& operator++(T& d) { return d = T(int(d) + 1); } \
inline T& operator--(T& d) { return d = T(int(d) - 1); } \
inline T operator/(T d, int i) { return T(int(d) / i); } \
inline int operator/(T d1, T d2) { return int(d1) / int(d2); } \
+inline T& operator*=(T& d, int i) { return d = T(int(d) * i); } \
inline T& operator/=(T& d, int i) { return d = T(int(d) / i); }
ENABLE_FULL_OPERATORS_ON(Value)
return make_score(mg_value(s) / i, eg_value(s) / i);
}
-extern Value PieceValue[PHASE_NB][PIECE_NB];
+/// Multiplication of a Score by an integer. We check for overflow in debug mode.
+inline Score operator*(Score s, int i) {
+ Score result = Score(int(s) * i);
+
+ assert(eg_value(result) == (i * eg_value(s)));
+ assert(mg_value(result) == (i * mg_value(s)));
+ assert((i == 0) || (result / i) == s );
+
+ return result;
+}
inline Color operator~(Color c) {
- return Color(c ^ BLACK);
+ return Color(c ^ BLACK); // Toggle color
}
inline Square operator~(Square s) {
return Square(s ^ SQ_A8); // Vertical flip SQ_A1 -> SQ_A8
}
+inline Piece operator~(Piece pc) {
+ return Piece(pc ^ 8); // Swap color of piece B_KNIGHT -> W_KNIGHT
+}
+
inline CastlingRight operator|(Color c, CastlingSide s) {
return CastlingRight(WHITE_OO << ((s == QUEEN_SIDE) + 2 * c));
}
}
inline Square make_square(File f, Rank r) {
- return Square((r << 3) | f);
+ return Square((r << 3) + f);
}
inline Piece make_piece(Color c, PieceType pt) {
- return Piece((c << 3) | pt);
+ return Piece((c << 3) + pt);
}
inline PieceType type_of(Piece pc) {
}
inline Square pawn_push(Color c) {
- return c == WHITE ? DELTA_N : DELTA_S;
+ return c == WHITE ? NORTH : SOUTH;
}
inline Square from_sq(Move m) {
}
inline Move make_move(Square from, Square to) {
- return Move(to | (from << 6));
+ return Move((from << 6) + to);
}
template<MoveType T>
inline Move make(Square from, Square to, PieceType pt = KNIGHT) {
- return Move(to | (from << 6) | T | ((pt - KNIGHT) << 12));
+ return Move(T + ((pt - KNIGHT) << 12) + (from << 6) + to);
}
inline bool is_ok(Move m) {
projects / stockfish / blobdiff