Introduce Score struct

[stockfish] / src / value.h

diff --git a/src/value.h b/src/value.h
index f60e286fb46f70e46dd4fb1858a9996fc23d71b3..ee093a6e13dcc32ea4ef8adb1ac972812c4498be 100644 (file)
--- a/src/value.h
+++ b/src/value.h
@@ -1,17 +1,18 @@
 /*
-  Glaurung, a UCI chess playing engine.
-  Copyright (C) 2004-2008 Tord Romstad
+  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
 
-  Glaurung is free software: you can redistribute it and/or modify
+  Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
-  
-  Glaurung is distributed in the hope that it will be useful,
+
+  Stockfish is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
-  
+
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
@@ -35,7 +36,10 @@ enum ValueType {
   VALUE_TYPE_NONE = 0,
   VALUE_TYPE_UPPER = 1,  // Upper bound
   VALUE_TYPE_LOWER = 2,  // Lower bound
-  VALUE_TYPE_EXACT = 3   // Exact score
+  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
 };
 
 
@@ -48,6 +52,40 @@ enum 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;
+};
+
+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& 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; }
+
+    Value mg() const { return Value(v.v32.mgv); }
+    Value eg() const { return Value(v.v32.egv); }
+
+private:
+    ScoreValue v;
+};
+
+inline Score operator*(int i, Score s) { return Score(i * s.mg(), i * s.eg()); }
+inline Score operator*(Score s, int i) { return s * i; }
+inline Score operator-(Score s) { return Score(-s.mg(), -s.eg()); }
+
+extern std::ostream& operator<<(std::ostream& os, Score s);
+
 ////
 //// Constants and variables
 ////
@@ -57,17 +95,19 @@ enum Value {
 /// Important: If the material values are changed, one must also
 /// adjust the piece square tables, and the method game_phase() in the
 /// Position class!
-
-const Value PawnValueMidgame = Value(0xCC);
-const Value PawnValueEndgame = Value(0x100);
-const Value KnightValueMidgame = Value(0x340);
-const Value KnightValueEndgame = Value(0x340);
-const Value BishopValueMidgame = Value(0x340);
-const Value BishopValueEndgame = Value(0x340);
-const Value RookValueMidgame = Value(0x505);
-const Value RookValueEndgame = Value(0x505);
-const Value QueenValueMidgame = Value(0xA00);
-const Value QueenValueEndgame = Value(0xA00);
+///
+/// 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),
@@ -89,10 +129,9 @@ const Value PieceValueEndgame[17] = {
   Value(0), Value(0), Value(0)
 };
 
-/// Bonus for having the side to move
+/// Bonus for having the side to move (modified by Joona Kiiski)
 
-const Value TempoValueMidgame = Value(50);
-const Value TempoValueEndgame = Value(20);
+const Score TempoValue = Score(48, 22);
 
 
 ////
@@ -120,7 +159,7 @@ 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));
 }
-               
+
 inline Value value_mated_in(int ply) {
   return Value(-VALUE_MATE + Value(ply));
 }