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Re-arrange history update code 

Unify the quites moves loop for both cases,
the compiler optimizes away the

 if (is_ok((ss-1)->currentMove))

inside loop, so that the result is same
speed as original.

No functional change.
pull/293/head
Marco Costalba 2015-03-15 10:05:57 +01:00
parent 13d4df95cd
commit a4b2eeea75
1 changed files with 18 additions and 22 deletions
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40
src/search.cpp
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@ -1396,8 +1396,8 @@ moves_loop: // When in check and at SpNode search starts from here
*pv = MOVE_NONE;
}
// update_stats() updates killers, history, countermoves and followupmoves stats after a fail-high
// of a quiet move.
// update_stats() updates killers, history, countermoves and followupmoves
// stats after a fail-high of a quiet move.
void update_stats(const Position& pos, Stack* ss, Move move, Depth depth, Move* quiets, int quietsCnt) {
@ -1407,36 +1407,32 @@ moves_loop: // When in check and at SpNode search starts from here
ss->killers[0] = move;
}
// Increase history value of the cut-off move and decrease all the other
// played quiet moves.
Value bonus = Value((depth / ONE_PLY) * (depth / ONE_PLY));
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);
}
Square prevSq = to_sq((ss-1)->currentMove);
HistoryStats& cmh = CounterMovesHistory[pos.piece_on(prevSq)][prevSq];
History.update(pos.moved_piece(move), to_sq(move), bonus);
if (is_ok((ss-1)->currentMove))
{
Square prevMoveSq = to_sq((ss-1)->currentMove);
Piece prevMovePiece = pos.piece_on(prevMoveSq);
Countermoves.update(prevMovePiece, prevMoveSq, move);
HistoryStats& cmh = CounterMovesHistory[prevMovePiece][prevMoveSq];
Countermoves.update(pos.piece_on(prevSq), prevSq, move);
cmh.update(pos.moved_piece(move), to_sq(move), bonus);
for (int i = 0; i < quietsCnt; ++i)
{
Move m = quiets[i];
cmh.update(pos.moved_piece(m), to_sq(m), -bonus);
}
}
// Decrease all the other played quiet moves
for (int i = 0; i < quietsCnt; ++i)
{
History.update(pos.moved_piece(quiets[i]), to_sq(quiets[i]), -bonus);
if (is_ok((ss-1)->currentMove))
cmh.update(pos.moved_piece(quiets[i]), to_sq(quiets[i]), -bonus);
}
if (is_ok((ss-2)->currentMove) && (ss-1)->currentMove == (ss-1)->ttMove)
{
Square prevOwnMoveSq = to_sq((ss-2)->currentMove);
Followupmoves.update(pos.piece_on(prevOwnMoveSq), prevOwnMoveSq, move);
Square prevPrevSq = to_sq((ss-2)->currentMove);
Followupmoves.update(pos.piece_on(prevPrevSq), prevPrevSq, move);
}
}