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Micro optimization of generate_piece_moves()

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This patch make the piece list always terminated by SQ_NONE,
so that we can use a simpler and faster loop in move
generation.

Speedup is about 0.6%.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-09-23 21:45:32 +01:00
parent dcb323bf0d
commit 48b74142ef
3 changed files with 12 additions and 4 deletions
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3
src/position.cpp
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@@ -838,6 +838,7 @@ void Position::do_move(Move m, StateInfo& newSt, Bitboard dcCandidates) {
Square lastPawnSquare = pieceList[us][PAWN][pieceCount[us][PAWN]];
index[lastPawnSquare] = index[to];
pieceList[us][PAWN][index[lastPawnSquare]] = lastPawnSquare;
pieceList[us][PAWN][pieceCount[us][PAWN]] = SQ_NONE;
index[to] = pieceCount[us][promotion] - 1;
pieceList[us][promotion][index[to]] = to;
@@ -943,6 +944,7 @@ void Position::do_capture_move(Bitboard& key, PieceType capture, Color them, Squ
Square lastPieceSquare = pieceList[them][capture][pieceCount[them][capture]];
index[lastPieceSquare] = index[capsq];
pieceList[them][capture][index[lastPieceSquare]] = lastPieceSquare;
pieceList[them][capture][pieceCount[them][capture]] = SQ_NONE;
// Reset rule 50 counter
st->rule50 = 0;
@@ -1099,6 +1101,7 @@ void Position::undo_move(Move m) {
Square lastPromotionSquare = pieceList[us][promotion][pieceCount[us][promotion]];
index[lastPromotionSquare] = index[to];
pieceList[us][promotion][index[lastPromotionSquare]] = lastPromotionSquare;
pieceList[us][promotion][pieceCount[us][promotion]] = SQ_NONE;
index[to] = pieceCount[us][PAWN] - 1;
pieceList[us][PAWN][index[to]] = to;
}