/*
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) 2015-2017 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+ Copyright (C) 2004-2020 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <cassert>
#include <cctype>
-#include <climits>
#include <cstdint>
#include <cstdlib>
+#include <algorithm>
#if defined(_MSC_VER)
// Disable some silly and noisy warning from MSVC compiler
/// _WIN32 Building on Windows (any)
/// _WIN64 Building on Windows 64 bit
+#if defined(__GNUC__ ) && (__GNUC__ < 9 || (__GNUC__ == 9 && __GNUC_MINOR__ <= 2)) && defined(_WIN32) && !defined(__clang__)
+#define ALIGNAS_ON_STACK_VARIABLES_BROKEN
+#endif
+
+#define ASSERT_ALIGNED(ptr, alignment) assert(reinterpret_cast<uintptr_t>(ptr) % alignment == 0)
+
#if defined(_WIN64) && defined(_MSC_VER) // No Makefile used
# include <intrin.h> // Microsoft header for _BitScanForward64()
# define IS_64BIT
# include <immintrin.h> // Header for _pext_u64() intrinsic
# define pext(b, m) _pext_u64(b, m)
#else
-# define pext(b, m) (0)
+# define pext(b, m) 0
#endif
#ifdef USE_POPCNT
-const bool HasPopCnt = true;
+constexpr bool HasPopCnt = true;
#else
-const bool HasPopCnt = false;
+constexpr bool HasPopCnt = false;
#endif
#ifdef USE_PEXT
-const bool HasPext = true;
+constexpr bool HasPext = true;
#else
-const bool HasPext = false;
+constexpr bool HasPext = false;
#endif
#ifdef IS_64BIT
-const bool Is64Bit = true;
+constexpr bool Is64Bit = true;
#else
-const bool Is64Bit = false;
+constexpr bool Is64Bit = false;
#endif
typedef uint64_t Key;
typedef uint64_t Bitboard;
-const int MAX_MOVES = 256;
-const int MAX_PLY = 128;
+constexpr int MAX_MOVES = 256;
+constexpr int MAX_PLY = 246;
/// A move needs 16 bits to be stored
///
};
enum Color {
- WHITE, BLACK, NO_COLOR, COLOR_NB = 2
-};
-
-enum CastlingSide {
- KING_SIDE, QUEEN_SIDE, CASTLING_SIDE_NB = 2
+ WHITE, BLACK, COLOR_NB = 2
};
-enum CastlingRight {
+enum CastlingRights {
NO_CASTLING,
WHITE_OO,
WHITE_OOO = WHITE_OO << 1,
BLACK_OO = WHITE_OO << 2,
BLACK_OOO = WHITE_OO << 3,
- ANY_CASTLING = WHITE_OO | WHITE_OOO | BLACK_OO | BLACK_OOO,
- CASTLING_RIGHT_NB = 16
-};
-template<Color C, CastlingSide S> struct MakeCastling {
- static const CastlingRight
- right = C == WHITE ? S == QUEEN_SIDE ? WHITE_OOO : WHITE_OO
- : S == QUEEN_SIDE ? BLACK_OOO : BLACK_OO;
+ KING_SIDE = WHITE_OO | BLACK_OO,
+ QUEEN_SIDE = WHITE_OOO | BLACK_OOO,
+ WHITE_CASTLING = WHITE_OO | WHITE_OOO,
+ BLACK_CASTLING = BLACK_OO | BLACK_OOO,
+ ANY_CASTLING = WHITE_CASTLING | BLACK_CASTLING,
+
+ CASTLING_RIGHT_NB = 16
};
enum Phase {
enum ScaleFactor {
SCALE_FACTOR_DRAW = 0,
- SCALE_FACTOR_ONEPAWN = 48,
SCALE_FACTOR_NORMAL = 64,
SCALE_FACTOR_MAX = 128,
SCALE_FACTOR_NONE = 255
VALUE_INFINITE = 32001,
VALUE_NONE = 32002,
- VALUE_MATE_IN_MAX_PLY = VALUE_MATE - 2 * MAX_PLY,
- VALUE_MATED_IN_MAX_PLY = -VALUE_MATE + 2 * MAX_PLY,
+ VALUE_TB_WIN_IN_MAX_PLY = VALUE_MATE - 2 * MAX_PLY,
+ VALUE_TB_LOSS_IN_MAX_PLY = -VALUE_TB_WIN_IN_MAX_PLY,
+ VALUE_MATE_IN_MAX_PLY = VALUE_MATE - MAX_PLY,
+ VALUE_MATED_IN_MAX_PLY = -VALUE_MATE_IN_MAX_PLY,
- PawnValueMg = 188, PawnValueEg = 248,
- KnightValueMg = 753, KnightValueEg = 832,
- BishopValueMg = 826, BishopValueEg = 897,
- RookValueMg = 1285, RookValueEg = 1371,
- QueenValueMg = 2513, QueenValueEg = 2650,
+ PawnValueMg = 126, PawnValueEg = 208,
+ KnightValueMg = 781, KnightValueEg = 854,
+ BishopValueMg = 825, BishopValueEg = 915,
+ RookValueMg = 1276, RookValueEg = 1380,
+ QueenValueMg = 2538, QueenValueEg = 2682,
+ Tempo = 28,
MidgameLimit = 15258, EndgameLimit = 3915
};
enum Piece {
NO_PIECE,
- W_PAWN = 1, W_KNIGHT, W_BISHOP, W_ROOK, W_QUEEN, W_KING,
- B_PAWN = 9, B_KNIGHT, B_BISHOP, B_ROOK, B_QUEEN, B_KING,
+ W_PAWN = PAWN, W_KNIGHT, W_BISHOP, W_ROOK, W_QUEEN, W_KING,
+ B_PAWN = PAWN + 8, B_KNIGHT, B_BISHOP, B_ROOK, B_QUEEN, B_KING,
PIECE_NB = 16
};
-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];
+constexpr Value PieceValue[PHASE_NB][PIECE_NB] = {
+ { VALUE_ZERO, PawnValueMg, KnightValueMg, BishopValueMg, RookValueMg, QueenValueMg, VALUE_ZERO, VALUE_ZERO,
+ VALUE_ZERO, PawnValueMg, KnightValueMg, BishopValueMg, RookValueMg, QueenValueMg, VALUE_ZERO, VALUE_ZERO },
+ { VALUE_ZERO, PawnValueEg, KnightValueEg, BishopValueEg, RookValueEg, QueenValueEg, VALUE_ZERO, VALUE_ZERO,
+ VALUE_ZERO, PawnValueEg, KnightValueEg, BishopValueEg, RookValueEg, QueenValueEg, VALUE_ZERO, VALUE_ZERO }
+};
-enum Depth : int {
+typedef int Depth;
- ONE_PLY = 1,
+enum : int {
+ DEPTH_QS_CHECKS = 0,
+ DEPTH_QS_NO_CHECKS = -1,
+ DEPTH_QS_RECAPTURES = -5,
- DEPTH_ZERO = 0 * ONE_PLY,
- DEPTH_QS_CHECKS = 0 * ONE_PLY,
- DEPTH_QS_NO_CHECKS = -1 * ONE_PLY,
- DEPTH_QS_RECAPTURES = -5 * ONE_PLY,
+ DEPTH_NONE = -6,
- DEPTH_NONE = -6 * ONE_PLY,
- DEPTH_MAX = MAX_PLY * ONE_PLY
+ DEPTH_OFFSET = -7 // value used only for TT entry occupancy check
};
-static_assert(!(ONE_PLY & (ONE_PLY - 1)), "ONE_PLY is not a power of 2");
-
-enum Square {
+enum Square : int {
SQ_A1, SQ_B1, SQ_C1, SQ_D1, SQ_E1, SQ_F1, SQ_G1, SQ_H1,
SQ_A2, SQ_B2, SQ_C2, SQ_D2, SQ_E2, SQ_F2, SQ_G2, SQ_H2,
SQ_A3, SQ_B3, SQ_C3, SQ_D3, SQ_E3, SQ_F3, SQ_G3, SQ_H3,
SQ_A8, SQ_B8, SQ_C8, SQ_D8, SQ_E8, SQ_F8, SQ_G8, SQ_H8,
SQ_NONE,
- SQUARE_NB = 64,
+ SQUARE_ZERO = 0,
+ SQUARE_NB = 64
+};
+enum Direction : int {
NORTH = 8,
EAST = 1,
- SOUTH = -8,
- WEST = -1,
+ SOUTH = -NORTH,
+ WEST = -EAST,
NORTH_EAST = NORTH + EAST,
SOUTH_EAST = SOUTH + EAST,
RANK_1, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8, RANK_NB
};
+// Keep track of what a move changes on the board (used by NNUE)
+struct DirtyPiece {
+
+ // Number of changed pieces
+ int dirty_num;
-/// 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. Take some
-/// care to avoid left-shifting a signed int to avoid undefined behavior.
+ // Max 3 pieces can change in one move. A promotion with capture moves
+ // both the pawn and the captured piece to SQ_NONE and the piece promoted
+ // to from SQ_NONE to the capture square.
+ Piece piece[3];
+
+ // From and to squares, which may be SQ_NONE
+ Square from[3];
+ Square to[3];
+};
+
+/// Score enum stores a middlegame and an endgame value in a single integer (enum).
+/// The least significant 16 bits are used to store the middlegame value and the
+/// upper 16 bits are used to store the endgame value. We have to take 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) {
+constexpr Score make_score(int mg, int eg) {
return Score((int)((unsigned int)eg << 16) + mg);
}
/// according to the standard a simple cast to short is implementation defined
/// and so is a right shift of a signed integer.
inline Value eg_value(Score s) {
-
union { uint16_t u; int16_t s; } eg = { uint16_t(unsigned(s + 0x8000) >> 16) };
return Value(eg.s);
}
inline Value mg_value(Score 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-(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; } \
-
-#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); } \
+#define ENABLE_BASE_OPERATORS_ON(T) \
+constexpr T operator+(T d1, int d2) { return T(int(d1) + d2); } \
+constexpr T operator-(T d1, int d2) { return T(int(d1) - d2); } \
+constexpr T operator-(T d) { return T(-int(d)); } \
+inline T& operator+=(T& d1, int d2) { return d1 = d1 + d2; } \
+inline T& operator-=(T& d1, int d2) { return d1 = d1 - d2; }
+
+#define ENABLE_INCR_OPERATORS_ON(T) \
+inline T& operator++(T& d) { return d = T(int(d) + 1); } \
+inline T& operator--(T& d) { return d = T(int(d) - 1); }
+
+#define ENABLE_FULL_OPERATORS_ON(T) \
+ENABLE_BASE_OPERATORS_ON(T) \
+constexpr T operator*(int i, T d) { return T(i * int(d)); } \
+constexpr T operator*(T d, int i) { return T(int(d) * i); } \
+constexpr T operator/(T d, int i) { return T(int(d) / i); } \
+constexpr 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)
-ENABLE_FULL_OPERATORS_ON(PieceType)
-ENABLE_FULL_OPERATORS_ON(Piece)
-ENABLE_FULL_OPERATORS_ON(Color)
-ENABLE_FULL_OPERATORS_ON(Depth)
-ENABLE_FULL_OPERATORS_ON(Square)
-ENABLE_FULL_OPERATORS_ON(File)
-ENABLE_FULL_OPERATORS_ON(Rank)
+ENABLE_FULL_OPERATORS_ON(Direction)
+
+ENABLE_INCR_OPERATORS_ON(Piece)
+ENABLE_INCR_OPERATORS_ON(PieceType)
+ENABLE_INCR_OPERATORS_ON(Square)
+ENABLE_INCR_OPERATORS_ON(File)
+ENABLE_INCR_OPERATORS_ON(Rank)
ENABLE_BASE_OPERATORS_ON(Score)
#undef ENABLE_FULL_OPERATORS_ON
+#undef ENABLE_INCR_OPERATORS_ON
#undef ENABLE_BASE_OPERATORS_ON
-/// Additional operators to add integers to a Value
-inline Value operator+(Value v, int i) { return Value(int(v) + i); }
-inline Value operator-(Value v, int i) { return Value(int(v) - i); }
-inline Value& operator+=(Value& v, int i) { return v = v + i; }
-inline Value& operator-=(Value& v, int i) { return v = v - i; }
+/// Additional operators to add a Direction to a Square
+constexpr Square operator+(Square s, Direction d) { return Square(int(s) + int(d)); }
+constexpr Square operator-(Square s, Direction d) { return Square(int(s) - int(d)); }
+inline Square& operator+=(Square& s, Direction d) { return s = s + d; }
+inline Square& operator-=(Square& s, Direction d) { return s = s - d; }
/// Only declared but not defined. We don't want to multiply two scores due to
/// a very high risk of overflow. So user should explicitly convert to integer.
-inline Score operator*(Score s1, Score s2);
+Score operator*(Score, Score) = delete;
/// Division of a Score must be handled separately for each term
inline Score operator/(Score s, int i) {
/// 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 );
+ assert((i == 0) || (result / i) == s);
return result;
}
-inline Color operator~(Color c) {
+/// Multiplication of a Score by a boolean
+inline Score operator*(Score s, bool b) {
+ return b ? s : SCORE_ZERO;
+}
+
+constexpr Color operator~(Color c) {
return Color(c ^ BLACK); // Toggle color
}
-inline Square operator~(Square s) {
- return Square(s ^ SQ_A8); // Vertical flip SQ_A1 -> SQ_A8
+constexpr Square flip_rank(Square s) { // Swap A1 <-> A8
+ return Square(s ^ SQ_A8);
+}
+
+constexpr Square flip_file(Square s) { // Swap A1 <-> H1
+ return Square(s ^ SQ_H1);
}
-inline Piece operator~(Piece pc) {
- return Piece(pc ^ 8); // Swap color of piece B_KNIGHT -> W_KNIGHT
+constexpr 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));
+constexpr CastlingRights operator&(Color c, CastlingRights cr) {
+ return CastlingRights((c == WHITE ? WHITE_CASTLING : BLACK_CASTLING) & cr);
}
-inline Value mate_in(int ply) {
+constexpr Value mate_in(int ply) {
return VALUE_MATE - ply;
}
-inline Value mated_in(int ply) {
+constexpr Value mated_in(int ply) {
return -VALUE_MATE + ply;
}
-inline Square make_square(File f, Rank r) {
+constexpr Square make_square(File f, Rank r) {
return Square((r << 3) + f);
}
-inline Piece make_piece(Color c, PieceType pt) {
+constexpr Piece make_piece(Color c, PieceType pt) {
return Piece((c << 3) + pt);
}
-inline PieceType type_of(Piece pc) {
+constexpr PieceType type_of(Piece pc) {
return PieceType(pc & 7);
}
return Color(pc >> 3);
}
-inline bool is_ok(Square s) {
+constexpr bool is_ok(Square s) {
return s >= SQ_A1 && s <= SQ_H8;
}
-inline File file_of(Square s) {
+constexpr File file_of(Square s) {
return File(s & 7);
}
-inline Rank rank_of(Square s) {
+constexpr Rank rank_of(Square s) {
return Rank(s >> 3);
}
-inline Square relative_square(Color c, Square s) {
+constexpr Square relative_square(Color c, Square s) {
return Square(s ^ (c * 56));
}
-inline Rank relative_rank(Color c, Rank r) {
+constexpr Rank relative_rank(Color c, Rank r) {
return Rank(r ^ (c * 7));
}
-inline Rank relative_rank(Color c, Square s) {
+constexpr Rank relative_rank(Color c, Square s) {
return relative_rank(c, rank_of(s));
}
-inline bool opposite_colors(Square s1, Square s2) {
- int s = int(s1) ^ int(s2);
- return ((s >> 3) ^ s) & 1;
-}
-
-inline Square pawn_push(Color c) {
+constexpr Direction pawn_push(Color c) {
return c == WHITE ? NORTH : SOUTH;
}
-inline Square from_sq(Move m) {
+constexpr Square from_sq(Move m) {
return Square((m >> 6) & 0x3F);
}
-inline Square to_sq(Move m) {
+constexpr Square to_sq(Move m) {
return Square(m & 0x3F);
}
-inline MoveType type_of(Move m) {
+constexpr int from_to(Move m) {
+ return m & 0xFFF;
+}
+
+constexpr MoveType type_of(Move m) {
return MoveType(m & (3 << 14));
}
-inline PieceType promotion_type(Move m) {
+constexpr PieceType promotion_type(Move m) {
return PieceType(((m >> 12) & 3) + KNIGHT);
}
-inline Move make_move(Square from, Square to) {
+constexpr Move make_move(Square from, Square to) {
return Move((from << 6) + to);
}
+constexpr Move reverse_move(Move m) {
+ return make_move(to_sq(m), from_sq(m));
+}
+
template<MoveType T>
-inline Move make(Square from, Square to, PieceType pt = KNIGHT) {
+constexpr Move make(Square from, Square to, PieceType pt = KNIGHT) {
return Move(T + ((pt - KNIGHT) << 12) + (from << 6) + to);
}
-inline bool is_ok(Move m) {
+constexpr bool is_ok(Move m) {
return from_sq(m) != to_sq(m); // Catch MOVE_NULL and MOVE_NONE
}
+/// Based on a congruential pseudo random number generator
+constexpr Key make_key(uint64_t seed) {
+ return seed * 6364136223846793005ULL + 1442695040888963407ULL;
+}
+
#endif // #ifndef TYPES_H_INCLUDED
+
+#include "tune.h" // Global visibility to tuning setup
projects / stockfish / blobdiff