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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 from = from_sq(m);
Square to = to_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; 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, Move m) { table[pc][to] = m; }
void update(Piece pc, Square to, Value v) { 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; table[pc][to] += int(v) * 32;
} }

4
tests/instrumented.sh
View file

@ -61,6 +61,10 @@ cat << EOF > game.exp
send "go nodes 1000\n" send "go nodes 1000\n"
expect "bestmove" expect "bestmove"
send "position fen 5rk1/1K4p1/8/8/3B4/8/8/8 b - - 0 1\n"
send "go depth 30\n"
expect "bestmove"
send "quit\n" send "quit\n"
expect eof expect eof