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History stat bonus: Move condition to bonus calculation

Browse source 
about 0.5% speedup.

No functional change

Closes #1034
This commit is contained in:
Joost VandeVondele 2017-03-17 14:45:27 -07:00 • committed by Joona Kiiski
parent c076216a32
commit c80d52c845
2 changed files with 1 additions and 7 deletions
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6
src/movepick.h
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@ -39,9 +39,6 @@ struct HistoryStats {
void clear() { std::memset(table, 0, sizeof(table)); }
void update(Color c, Move m, Value v) {
if (abs(int(v)) >= 324)
return;
Square from = from_sq(m);
Square to = to_sq(m);
@ -68,9 +65,6 @@ struct Stats {
void update(Piece pc, Square to, Move m) { table[pc][to] = m; }
void update(Piece pc, Square to, Value v) {
if (abs(int(v)) >= 324)
return;
table[pc][to] -= table[pc][to] * abs(int(v)) / 936;
table[pc][to] += int(v) * 32;
}

2
src/search.cpp
View file

@ -82,7 +82,7 @@ namespace {
// History and stats update bonus, based on depth
Value stat_bonus(Depth depth) {
int d = depth / ONE_PLY ;
return Value(d * d + 2 * d - 2);
return d > 17 ? VALUE_ZERO : Value(d * d + 2 * d - 2);
}
// Skill structure is used to implement strength limit