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Code Issues Releases Wiki Activity

Remove duplicated code

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Introduce update_stats() and remove correspondng
duplicated code.

No functional change.
This commit is contained in:
Pablo Vazquez 2014-01-05 14:08:26 +01:00 • committed by Marco Costalba
parent 8454d871ec
commit 0118623495
1 changed files with 35 additions and 43 deletions
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78
src/search.cpp
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@ -94,6 +94,7 @@ namespace {
void id_loop(Position& pos);
Value value_to_tt(Value v, int ply);
Value value_from_tt(Value v, int ply);
void update_stats(Position& pos, Stack* ss, Move move, Depth depth, Move* quiets, int quietsCnt);
string uci_pv(const Position& pos, int depth, Value alpha, Value beta);
struct Skill {
@ -566,27 +567,10 @@ namespace {
TT.refresh(tte);
ss->currentMove = ttMove; // Can be MOVE_NONE
// Update killers, history, and counter move on TT hit
if ( ttValue >= beta
&& ttMove
&& !pos.capture_or_promotion(ttMove)
&& !inCheck)
{
if (ss->killers[0] != ttMove)
{
ss->killers[1] = ss->killers[0];
ss->killers[0] = ttMove;
}
// If ttMove is quiet, update killers, history, and counter move on TT hit
if (ttValue >= beta && ttMove && !pos.capture_or_promotion(ttMove) && !inCheck)
update_stats(pos, ss, ttMove, depth, NULL, 0);
Value bonus = Value(int(depth) * int(depth));
History.update(pos.moved_piece(ttMove), to_sq(ttMove), bonus);
if (is_ok((ss-1)->currentMove))
{
Square prevMoveSq = to_sq((ss-1)->currentMove);
Countermoves.update(pos.piece_on(prevMoveSq), prevMoveSq, ttMove);
}
}
return ttValue;
}
@ -1063,29 +1047,8 @@ moves_loop: // When in check and at SpNode search starts from here
depth, bestMove, ss->staticEval);
// Quiet best move: update killers, history and countermoves
if ( bestValue >= beta
&& !pos.capture_or_promotion(bestMove)
&& !inCheck)
{
if (ss->killers[0] != bestMove)
{
ss->killers[1] = ss->killers[0];
ss->killers[0] = bestMove;
}
// Increase history value of the cut-off move and decrease all the other
// played non-capture moves.
Value bonus = Value(int(depth) * int(depth));
History.update(pos.moved_piece(bestMove), to_sq(bestMove), bonus);
for (int i = 0; i < quietCount - 1; ++i)
{
Move m = quietsSearched[i];
History.update(pos.moved_piece(m), to_sq(m), -bonus);
}
if (is_ok((ss-1)->currentMove))
Countermoves.update(pos.piece_on(prevMoveSq), prevMoveSq, bestMove);
}
if (bestValue >= beta && !pos.capture_or_promotion(bestMove) && !inCheck)
update_stats(pos, ss, bestMove, depth, quietsSearched, quietCount - 1);
assert(bestValue > -VALUE_INFINITE && bestValue < VALUE_INFINITE);
@ -1318,6 +1281,35 @@ moves_loop: // When in check and at SpNode search starts from here
}
// update_stats() updates killers, history and countermoves stats after a fail-high
// of a quiet move.
void update_stats(Position& pos, Stack* ss, Move move, Depth depth, Move* quiets, int quietsCnt) {
if (ss->killers[0] != move)
{
ss->killers[1] = ss->killers[0];
ss->killers[0] = move;
}
// Increase history value of the cut-off move and decrease all the other
// played quiet moves.
Value bonus = Value(int(depth) * int(depth));
History.update(pos.moved_piece(move), to_sq(move), bonus);
for (int i = 0; i < quietsCnt; ++i)
{
Move m = quiets[i];
History.update(pos.moved_piece(m), to_sq(m), -bonus);
}
if (is_ok((ss-1)->currentMove))
{
Square prevMoveSq = to_sq((ss-1)->currentMove);
Countermoves.update(pos.piece_on(prevMoveSq), prevMoveSq, move);
}
}
// When playing with a strength handicap, choose best move among the MultiPV
// set using a statistical rule dependent on 'level'. Idea by Heinz van Saanen.