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Partially restore HistoryMax

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Should be not useful but better safe than sorry.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-01-15 11:21:00 +01:00
parent 13a42284b6
commit 877b468e3e
2 changed files with 6 additions and 8 deletions
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src/history.h
+4 -6
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@@ -45,6 +45,8 @@ public:
Value gain(Piece p, Square to) const;
void update_gain(Piece p, Square to, Value delta);
static const int MaxValue = (1 << 29); // To avoid an overflow
private:
Value history[16][64]; // [piece][to_square]
Value maxGains[16][64]; // [piece][to_square]
@@ -60,7 +62,7 @@ inline int History::value(Piece p, Square to) const {
}
inline void History::update(Piece p, Square to, Value bonus) {
history[p][to] += bonus;
if (abs(history[p][to]) < MaxValue) history[p][to] += bonus;
}
inline Value History::gain(Piece p, Square to) const {
@@ -68,11 +70,7 @@ inline Value History::gain(Piece p, Square to) const {
}
inline void History::update_gain(Piece p, Square to, Value gain) {
if (gain >= maxGains[p][to])
maxGains[p][to] = gain;
else
maxGains[p][to]--;
maxGains[p][to] = (gain >= maxGains[p][to] ? gain : maxGains[p][to] - 1);
}
#endif // !defined(HISTORY_H_INCLUDED)