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Greatly speedup has_mate_threat()

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Instead of loop across all legal moves to find a mate
loop across possible check moves only.

This reduces more then 10 times the number of moves to
check for a possible mate.

Also rename generate_checks() in generate_non_capture_checks()
so to better clarify what the function does.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-04-20 09:10:27 +02:00
parent 24485c96ec
commit 7c267587fc
4 changed files with 18 additions and 17 deletions
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6
src/movegen.cpp
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@@ -176,10 +176,10 @@ int generate_noncaptures(const Position& pos, MoveStack* mlist) {
}
/// generate_checks() generates all pseudo-legal non-capturing, non-promoting
/// checks. It returns the number of generated moves.
/// generate_non_capture_checks() generates all pseudo-legal non-capturing,
/// non-promoting checks. It returns the number of generated moves.
int generate_checks(const Position& pos, MoveStack* mlist, Bitboard dc) {
int generate_non_capture_checks(const Position& pos, MoveStack* mlist, Bitboard dc) {
assert(pos.is_ok());
assert(!pos.is_check());