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Micro-optimize castling handling in do_move()

Browse Source 
And better self-document the code.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-06-11 12:41:20 +01:00
parent 735cac5d53
commit b21a5e2f06
4 changed files with 35 additions and 36 deletions
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33
src/position.cpp
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@@ -270,7 +270,7 @@ bool Position::set_castling_rights(char token) {
for (Square sq = sqH; sq >= sqA; sq--)
if (piece_on(sq) == rook)
{
do_allow_oo(c);
set_castle_kingside(c);
initialKRFile = square_file(sq);
break;
}
@@ -280,7 +280,7 @@ bool Position::set_castling_rights(char token) {
for (Square sq = sqA; sq <= sqH; sq++)
if (piece_on(sq) == rook)
{
do_allow_ooo(c);
set_castle_queenside(c);
initialQRFile = square_file(sq);
break;
}
@@ -290,12 +290,12 @@ bool Position::set_castling_rights(char token) {
File rookFile = File(token - 'A') + FILE_A;
if (rookFile < initialKFile)
{
do_allow_ooo(c);
set_castle_queenside(c);
initialQRFile = rookFile;
}
else
{
do_allow_oo(c);
set_castle_kingside(c);
initialKRFile = rookFile;
}
}
@@ -637,7 +637,7 @@ bool Position::move_is_pl(const Move m) const {
return move_is_pl_slow(m);
// Is not a promotion, so promotion piece must be empty
if (move_promotion_piece(m) - 2 != PIECE_TYPE_NONE)
if (promotion_piece_type(m) - 2 != PIECE_TYPE_NONE)
return false;
// If the from square is not occupied by a piece belonging to the side to
@@ -788,7 +788,7 @@ bool Position::move_gives_check(Move m, const CheckInfo& ci) const {
{
clear_bit(&b, from);
switch (move_promotion_piece(m))
switch (promotion_piece_type(m))
{
case KNIGHT:
return bit_is_set(attacks_from<KNIGHT>(to), ci.ksq);
@@ -949,13 +949,12 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
st->epSquare = SQ_NONE;
}
// Update castle rights, try to shortcut a common case
int cm = castleRightsMask[from] & castleRightsMask[to];
if (cm != ALL_CASTLES && ((cm & st->castleRights) != st->castleRights))
// Update castle rights if needed
if ( st->castleRights != CASTLES_NONE
&& (castleRightsMask[from] & castleRightsMask[to]) != ALL_CASTLES)
{
key ^= zobCastle[st->castleRights];
st->castleRights &= castleRightsMask[from];
st->castleRights &= castleRightsMask[to];
st->castleRights &= castleRightsMask[from] & castleRightsMask[to];
key ^= zobCastle[st->castleRights];
}
@@ -998,7 +997,7 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
if (pm) // promotion ?
{
PieceType promotion = move_promotion_piece(m);
PieceType promotion = promotion_piece_type(m);
assert(promotion >= KNIGHT && promotion <= QUEEN);
@@ -1278,7 +1277,7 @@ void Position::undo_move(Move m) {
if (pm) // promotion ?
{
PieceType promotion = move_promotion_piece(m);
PieceType promotion = promotion_piece_type(m);
pt = PAWN;
assert(promotion >= KNIGHT && promotion <= QUEEN);
@@ -1851,10 +1850,10 @@ void Position::flip() {
sideToMove = opposite_color(pos.side_to_move());
// Castling rights
if (pos.can_castle_kingside(WHITE)) do_allow_oo(BLACK);
if (pos.can_castle_queenside(WHITE)) do_allow_ooo(BLACK);
if (pos.can_castle_kingside(BLACK)) do_allow_oo(WHITE);
if (pos.can_castle_queenside(BLACK)) do_allow_ooo(WHITE);
if (pos.can_castle_kingside(WHITE)) set_castle_kingside(BLACK);
if (pos.can_castle_queenside(WHITE)) set_castle_queenside(BLACK);
if (pos.can_castle_kingside(BLACK)) set_castle_kingside(WHITE);
if (pos.can_castle_queenside(BLACK)) set_castle_queenside(WHITE);
initialKFile = pos.initialKFile;
initialKRFile = pos.initialKRFile;