/*
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
#if !defined(VALUE_H_INCLUDED)
#define VALUE_H_INCLUDED
-////
-//// Includes
-////
-
-#include "piece.h"
-
-
////
//// Types
////
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.
-union ScoreValue {
- int64_t v64;
- struct {
- int32_t mgv;
- int32_t egv;
- } v32;
+enum ScaleFactor {
+ SCALE_FACTOR_ZERO = 0,
+ SCALE_FACTOR_NORMAL = 64,
+ SCALE_FACTOR_MAX = 128,
+ SCALE_FACTOR_NONE = 255
};
-struct Score {
- Score() {}
- Score(const Score& s) { v = s.v; }
- Score(int mg, int eg) { v.v32.mgv = int32_t(mg); v.v32.egv = int32_t(eg); }
+/// 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.
- Score& operator=(const Score& s) { v = s.v; return *this; }
- Score& operator+=(const Score& s) { v.v32.mgv += s.v.v32.mgv; v.v32.egv += s.v.v32.egv; return *this; }
- Score& operator-=(const Score& s) { v.v32.mgv -= s.v.v32.mgv; v.v32.egv -= s.v.v32.egv; return *this; }
-
- bool operator==(const Score& s) { return v.v64 == s.v.v64; }
- bool operator!=(const Score& s) { return v.v64 != s.v.v64; }
-
- Value mg() const { return Value(v.v32.mgv); }
- Value eg() const { return Value(v.v32.egv); }
-
-private:
- ScoreValue v;
+// 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)
};
-inline Score operator+(Score s1, Score s2) { return Score(s1.mg() + s2.mg(), s1.eg() + s2.eg()); }
-inline Score operator-(Score s1, Score s2) { return Score(s1.mg() - s2.mg(), s1.eg() - s2.eg()); }
-inline Score operator*(Score s1, Score s2) { return Score(s1.mg() * s2.mg(), s1.eg() * s2.eg()); }
-inline Score operator*(int i, Score s) { return Score(i * s.mg(), i * s.eg()); }
-inline Score operator*(Score s, int i) { return Score(s.mg() * i, s.eg() * i); }
-inline Score operator/(Score s, int i) { return Score(s.mg() / i, s.eg() / i); }
-inline Score operator-(Score s) { return Score(-s.mg(), -s.eg()); }
+// 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); }
-extern std::ostream& operator<<(std::ostream& os, Score s);
+// 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)); }
+#else
+inline Value eg_value(Score s) { return Value((int)(unsigned(s) & 0x7fffu) - (int)(unsigned(s) & 0x8000u)); }
+#endif
-////
-//// Constants and variables
-////
-
-/// Piece values, middle game and endgame
-
-/// Important: If the material values are changed, one must also
-/// adjust the piece square tables, and the method game_phase() in the
-/// Position class!
-///
-/// Values modified by Joona Kiiski
-
-const Value PawnValueMidgame = Value(0x0C6);
-const Value PawnValueEndgame = Value(0x102);
-const Value KnightValueMidgame = Value(0x331);
-const Value KnightValueEndgame = Value(0x34E);
-const Value BishopValueMidgame = Value(0x344);
-const Value BishopValueEndgame = Value(0x359);
-const Value RookValueMidgame = Value(0x4F6);
-const Value RookValueEndgame = Value(0x4FE);
-const Value QueenValueMidgame = Value(0x9D9);
-const Value QueenValueEndgame = Value(0x9FE);
-
-const Value PieceValueMidgame[17] = {
- Value(0),
- PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
- RookValueMidgame, QueenValueMidgame,
- Value(0), Value(0), Value(0),
- PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
- RookValueMidgame, QueenValueMidgame,
- Value(0), Value(0), Value(0)
-};
+inline Score make_score(int mg, int eg) { return Score((mg << 16) + eg); }
-const Value PieceValueEndgame[17] = {
- Value(0),
- PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
- RookValueEndgame, QueenValueEndgame,
- Value(0), Value(0), Value(0),
- PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
- RookValueEndgame, QueenValueEndgame,
- Value(0), Value(0), Value(0)
-};
+// 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); }
-/// Bonus for having the side to move (modified by Joona Kiiski)
+// 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);
-const Score TempoValue = Score(48, 22);
+// Rest of operators are standard:
+inline Score operator+ (const Score d1, const Score d2) { return Score(int(d1) + int(d2)); }
+inline Score operator- (const Score d1, const Score d2) { return Score(int(d1) - int(d2)); }
+inline Score operator* (int i, const Score d) { return Score(i * int(d)); }
+inline Score operator* (const Score d, int i) { return Score(int(d) * i); }
+inline Score operator- (const Score d) { return Score(-int(d)); }
+inline void operator+= (Score& d1, const Score d2) { d1 = d1 + d2; }
+inline void operator-= (Score& d1, const Score d2) { d1 = d1 - d2; }
+inline void operator*= (Score& d, int i) { d = Score(int(d) * i); }
+inline void operator/= (Score& d, int i) { d = Score(int(d) / i); }
////
////
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 Value piece_value_midgame(PieceType pt) {
- return PieceValueMidgame[pt];
-}
-
-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