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Optimize for king moves in see_sign()

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Because we only test legal moves, a king move
cannot have negative SEE.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-06-19 15:44:03 +01:00
parent 47ee6d9fa4
commit 4e7a898d7e
1 changed files with 5 additions and 5 deletions
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10
src/position.cpp
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@@ -1307,11 +1307,11 @@ int Position::see_sign(Move m) const {
Square from = move_from(m);
Square to = move_to(m);
// Early return if SEE cannot be negative because capturing piece value
// is not bigger then captured one.
if ( midgame_value_of_piece_on(from) <= midgame_value_of_piece_on(to)
&& type_of_piece_on(from) != KING)
return 1;
// Early return if SEE cannot be negative because captured piece value
// is not less then capturing one. Note that king moves always return
// here because king midgame value is set to 0.
if (midgame_value_of_piece_on(to) >= midgame_value_of_piece_on(from))
return 1;
return see(from, to);
}