/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2009 Marco Costalba
+ Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, 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
////
enum ValueType {
- VALUE_TYPE_NONE = 0,
+ VALUE_TYPE_NONE = 0,
VALUE_TYPE_UPPER = 1, // Upper bound
VALUE_TYPE_LOWER = 2, // Lower bound
- VALUE_TYPE_EXACT = 3, // Exact score
- VALUE_TYPE_EVAL = 4, // Evaluation cache
- VALUE_TYPE_EV_UP = 5, // Evaluation cache for upper bound
- VALUE_TYPE_EV_LO = 6 // Evaluation cache for lower bound
+ VALUE_TYPE_EXACT = VALUE_TYPE_UPPER | VALUE_TYPE_LOWER
};
enum Value {
- VALUE_DRAW = 0,
+ VALUE_ZERO = 0,
+ VALUE_DRAW = 0,
VALUE_KNOWN_WIN = 15000,
- VALUE_MATE = 30000,
- VALUE_INFINITE = 30001,
- VALUE_NONE = 30002
+ VALUE_MATE = 30000,
+ VALUE_INFINITE = 30001,
+ VALUE_NONE = 30002,
+ VALUE_ENSURE_SIGNED = -1
};
+ENABLE_OPERATORS_ON(Value);
-/// Score struct keeps a midgame and an endgame value in a single
-/// ScoreValue 64 bit union.
-enum Score;
+enum ScaleFactor {
+ SCALE_FACTOR_ZERO = 0,
+ SCALE_FACTOR_NORMAL = 64,
+ SCALE_FACTOR_MAX = 128,
+ SCALE_FACTOR_NONE = 255
+};
+
+
+/// Score enum keeps a midgame and an endgame value in a single
+/// integer (enum), first LSB 16 bits are used to store endgame
+/// value, while upper bits are used for midgame value.
+
+// Compiler is free to choose the enum type as long as can keep
+// its data, so ensure Score to be an integer type.
+enum Score {
+ SCORE_ZERO = 0,
+ SCORE_ENSURE_32_BITS_SIZE_P = (1 << 16),
+ SCORE_ENSURE_32_BITS_SIZE_N = -(1 << 16)
+};
+
+ENABLE_OPERATORS_ON(Score);
+
+// Extracting the _signed_ lower and upper 16 bits it 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) { return Value(((int(s) + 32768) & ~0xffff) / 0x10000); }
+
+// Unfortunatly on Intel 64 bit we have a small speed regression, so use a faster code in
+// this case, although not 100% standard compliant it seems to work for Intel and MSVC.
+#if defined(IS_64BIT) && (!defined(__GNUC__) || defined(__INTEL_COMPILER))
inline Value eg_value(Score s) { return Value(int16_t(s & 0xffff)); }
-inline Value mg_value(Score s) { return Value((int(s) + 32768) >> 16); }
+#else
+inline Value eg_value(Score s) { return Value((int)(unsigned(s) & 0x7fffu) - (int)(unsigned(s) & 0x8000u)); }
+#endif
inline Score make_score(int mg, int eg) { return Score((mg << 16) + eg); }
-inline Score operator-(Score s) { return Score(-int(s)); }
-inline Score operator+(Score s1, Score s2) { return Score(int(s1) + int(s2)); }
-inline Score operator-(Score s1, Score s2) { return Score(int(s1) - int(s2)); }
-inline void operator+=(Score& s1, Score s2) { s1 = Score(int(s1) + int(s2)); }
-inline void operator-=(Score& s1, Score s2) { s1 = Score(int(s1) - int(s2)); }
-inline Score operator*(int i, Score s) { return Score(i * int(s)); }
-
// Division must be handled separately for each term
inline Score operator/(Score s, int i) { return make_score(mg_value(s) / i, eg_value(s) / i); }
const Value QueenValueEndgame = Value(0x9FE);
const Value PieceValueMidgame[17] = {
- Value(0),
+ VALUE_ZERO,
PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
RookValueMidgame, QueenValueMidgame,
- Value(0), Value(0), Value(0),
+ VALUE_ZERO, VALUE_ZERO, VALUE_ZERO,
PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
RookValueMidgame, QueenValueMidgame,
- Value(0), Value(0), Value(0)
+ VALUE_ZERO, VALUE_ZERO, VALUE_ZERO
};
const Value PieceValueEndgame[17] = {
- Value(0),
+ VALUE_ZERO,
PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
RookValueEndgame, QueenValueEndgame,
- Value(0), Value(0), Value(0),
+ VALUE_ZERO, VALUE_ZERO, VALUE_ZERO,
PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
RookValueEndgame, QueenValueEndgame,
- Value(0), Value(0), Value(0)
+ VALUE_ZERO, VALUE_ZERO, VALUE_ZERO
};
/// Bonus for having the side to move (modified by Joona Kiiski)
////
inline Value operator+ (Value v, int i) { return Value(int(v) + i); }
-inline Value operator+ (Value v1, Value v2) { return Value(int(v1) + int(v2)); }
-inline void operator+= (Value &v1, Value v2) {
- v1 = Value(int(v1) + int(v2));
-}
inline Value operator- (Value v, int i) { return Value(int(v) - i); }
-inline Value operator- (Value v) { return Value(-int(v)); }
-inline Value operator- (Value v1, Value v2) { return Value(int(v1) - int(v2)); }
-inline void operator-= (Value &v1, Value v2) {
- v1 = Value(int(v1) - int(v2));
-}
-inline Value operator* (Value v, int i) { return Value(int(v) * i); }
-inline void operator*= (Value &v, int i) { v = Value(int(v) * i); }
-inline Value operator* (int i, Value v) { return Value(int(v) * i); }
-inline Value operator/ (Value v, int i) { return Value(int(v) / i); }
-inline void operator/= (Value &v, int i) { v = Value(int(v) / i); }
inline Value value_mate_in(int ply) {
- return Value(VALUE_MATE - Value(ply));
+ return VALUE_MATE - ply;
}
inline Value value_mated_in(int ply) {
- return Value(-VALUE_MATE + Value(ply));
-}
-
-inline bool is_upper_bound(ValueType vt) {
- return (int(vt) & int(VALUE_TYPE_UPPER)) != 0;
+ return -VALUE_MATE + ply;
}
-inline bool is_lower_bound(ValueType vt) {
- return (int(vt) & int(VALUE_TYPE_LOWER)) != 0;
+inline int is_upper_bound(ValueType vt) {
+ return vt & VALUE_TYPE_UPPER;
}
-inline Value piece_value_midgame(PieceType pt) {
- return PieceValueMidgame[pt];
+inline int is_lower_bound(ValueType vt) {
+ return vt & VALUE_TYPE_LOWER;
}
-inline Value piece_value_endgame(PieceType pt) {
- return PieceValueEndgame[pt];
-}
-
-inline Value piece_value_midgame(Piece p) {
- return PieceValueMidgame[p];
-}
-
-inline Value piece_value_endgame(Piece p) {
- return PieceValueEndgame[p];
-}
-
-
-////
-//// Prototypes
-////
-
-extern Value value_to_tt(Value v, int ply);
-extern Value value_from_tt(Value v, int ply);
-extern int value_to_centipawns(Value v);
-extern Value value_from_centipawns(int cp);
-extern const std::string value_to_string(Value v);
-
-
#endif // !defined(VALUE_H_INCLUDED)
projects / stockfish / blobdiff