X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fhistory.h;h=0459c8fb48090b8b972438af6ad243d13ce630cd;hb=95212222c7444538b84326208e433ac12f15e9fb;hp=3fb74134466c272c08185476f918f558873e676c;hpb=4aeffc8c9a7ba870702974f62d1d3553ed227c00;p=stockfish
diff --git a/src/history.h b/src/history.h
index 3fb74134..0459c8fb 100644
--- a/src/history.h
+++ b/src/history.h
@@ -17,24 +17,17 @@
along with this program. If not, see .
*/
-
#if !defined(HISTORY_H_INCLUDED)
#define HISTORY_H_INCLUDED
-////
-//// Includes
-////
+#include
#include "depth.h"
-#include "move.h"
#include "piece.h"
+#include "square.h"
#include "value.h"
-////
-//// Types
-////
-
/// The History class stores statistics about how often different moves
/// have been successful or unsuccessful during the current search. These
/// statistics are used for reduction and move ordering decisions. History
@@ -45,45 +38,38 @@
class History {
public:
- History();
void clear();
- void success(Piece p, Square to, Depth d);
- void failure(Piece p, Square to, Depth d);
- int value(Piece p, Square to) const;
- void set_gain(Piece p, Square to, Value delta);
+ Value value(Piece p, Square to) const;
+ void update(Piece p, Square to, Value bonus);
Value gain(Piece p, Square to) const;
+ void update_gain(Piece p, Square to, Value gain);
+
+ static const Value MaxValue = Value(1 << 29); // To avoid an overflow
private:
- int history[16][64]; // [piece][square]
- int maxStaticValueDelta[16][64]; // [piece][from_square][to_square]
+ Value history[16][64]; // [piece][to_square]
+ Value maxGains[16][64]; // [piece][to_square]
};
+inline void History::clear() {
+ memset(history, 0, 16 * 64 * sizeof(Value));
+ memset(maxGains, 0, 16 * 64 * sizeof(Value));
+}
-////
-//// Constants and variables
-////
-
-/// HistoryMax controls how often the history counters will be scaled down:
-/// When the history score for a move gets bigger than HistoryMax, all
-/// entries in the table are divided by 2. It is difficult to guess what
-/// the ideal value of this constant is. Scaling down the scores often has
-/// the effect that parts of the search tree which have been searched
-/// recently have a bigger importance for move ordering than the moves which
-/// have been searched a long time ago.
-
-const int HistoryMax = 50000 * ONE_PLY;
-
-
-////
-//// Inline functions
-////
-
-inline int History::value(Piece p, Square to) const {
+inline Value History::value(Piece p, Square to) const {
return history[p][to];
}
+inline void History::update(Piece p, Square to, Value bonus) {
+ if (abs(history[p][to] + bonus) < MaxValue) history[p][to] += bonus;
+}
+
inline Value History::gain(Piece p, Square to) const {
- return Value(maxStaticValueDelta[p][to]);
+ return maxGains[p][to];
+}
+
+inline void History::update_gain(Piece p, Square to, Value gain) {
+ maxGains[p][to] = Max(gain, maxGains[p][to] - 1);
}
#endif // !defined(HISTORY_H_INCLUDED)