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Avoid an usless check in pl_move_is_legal

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Although very cheap this is a very hot path,
so avoid it.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-05-02 16:47:06 +01:00
parent aabd526f7c
commit 9144e48eb6
1 changed files with 4 additions and 6 deletions
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10
src/position.cpp
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@ -460,7 +460,9 @@ void Position::find_checkers() {
bool Position::pl_move_is_legal(Move m) const {
return pl_move_is_legal(m, pinned_pieces(side_to_move()));
// If we're in check, all pseudo-legal moves are legal, because our
// check evasion generator only generates true legal moves.
return is_check() || pl_move_is_legal(m, pinned_pieces(side_to_move()));
}
bool Position::pl_move_is_legal(Move m, Bitboard pinned) const {
@ -468,11 +470,7 @@ bool Position::pl_move_is_legal(Move m, Bitboard pinned) const {
assert(is_ok());
assert(move_is_ok(m));
assert(pinned == pinned_pieces(side_to_move()));
// If we're in check, all pseudo-legal moves are legal, because our
// check evasion generator only generates true legal moves.
if (is_check())
return true;
assert(!is_check());
// Castling moves are checked for legality during move generation.
if (move_is_castle(m))