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Introduce assert for stats update

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Make sure updates to the stats are done in a stable way.

No functional change

Closes #1038
Closes #1037
This commit is contained in:
Joost VandeVondele
2017-03-25 17:57:07 -07:00
committed by Joona Kiiski
parent 3b7c1a17e4
commit c5de4080db
2 changed files with 14 additions and 2 deletions
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12
src/movepick.h
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@@ -42,7 +42,11 @@ struct HistoryStats {
Square from = from_sq(m);
Square to = to_sq(m);
table[c][from][to] -= table[c][from][to] * abs(int(v)) / 324;
const int denom = 324;
assert(abs(int(v)) <= denom); // Needed for stability.
table[c][from][to] -= table[c][from][to] * abs(int(v)) / denom;
table[c][from][to] += int(v) * 32;
}
@@ -65,7 +69,11 @@ struct Stats {
void update(Piece pc, Square to, Move m) { table[pc][to] = m; }
void update(Piece pc, Square to, Value v) {
table[pc][to] -= table[pc][to] * abs(int(v)) / 936;
const int denom = 936;
assert(abs(int(v)) <= denom); // Needed for stability.
table[pc][to] -= table[pc][to] * abs(int(v)) / denom;
table[pc][to] += int(v) * 32;
}