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Simplify move legality check for uncommon cases

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Remove a bunch of difficult and tricky code to test
legality of castle and ep moves and instead use a slower
but simpler check against the list of generated legal moves.

Because these moves are very rare the performance impact
is small but code semplification is ver big: almost 100 lines
of difficult code removed !

No functionality change. No performance change (strangely enough
there is no even minimal performance regression in pgo builds but
instead a slightly and unexpected increase).

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-09-21 11:54:25 +01:00
parent 43ca5c926d
commit 8487069058
4 changed files with 31 additions and 123 deletions
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src/movegen.h
+1 -1
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@@ -36,7 +36,7 @@ extern MoveStack* generate_captures(const Position& pos, MoveStack* mlist);
extern MoveStack* generate_noncaptures(const Position& pos, MoveStack* mlist);
extern MoveStack* generate_non_capture_checks(const Position& pos, MoveStack* mlist, Bitboard dc);
extern MoveStack* generate_evasions(const Position& pos, MoveStack* mlist, Bitboard pinned);
extern MoveStack* generate_legal_moves(const Position& pos, MoveStack* mlist);
extern MoveStack* generate_moves(const Position& pos, MoveStack* mlist, bool pseudoLegal = false);
extern bool move_is_legal(const Position& pos, const Move m, Bitboard pinned);
extern bool move_is_legal(const Position& pos, const Move m);