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Prefer 0 to EmptyBoardBB

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Easier and even faster or at least easier to optimize.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-12-03 11:56:11 +01:00
parent 5c5af4fa65
commit a44c5cf4f7
9 changed files with 41 additions and 43 deletions
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6
src/position.cpp
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@@ -89,7 +89,7 @@ CheckInfo::CheckInfo(const Position& pos) {
checkSq[BISHOP] = pos.attacks_from<BISHOP>(ksq);
checkSq[ROOK] = pos.attacks_from<ROOK>(ksq);
checkSq[QUEEN] = checkSq[BISHOP] | checkSq[ROOK];
checkSq[KING] = EmptyBoardBB;
checkSq[KING] = 0;
}
@@ -931,7 +931,7 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
st->key = key;
// Update checkers bitboard, piece must be already moved
st->checkersBB = EmptyBoardBB;
st->checkersBB = 0;
if (moveIsCheck)
{
@@ -1697,7 +1697,7 @@ bool Position::pos_is_ok(int* failedStep) const {
if (debugBitboards)
{
// The intersection of the white and black pieces must be empty
if ((pieces(WHITE) & pieces(BLACK)) != EmptyBoardBB)
if (!(pieces(WHITE) & pieces(BLACK)))
return false;
// The union of the white and black pieces must be equal to all