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Replace aligned() function with line_bb() and simplify king piece detection

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From https://discord.com/channels/435943710472011776/813919248455827515/1342267241168900228

Saves 6 instructions

closes https://github.com/official-stockfish/Stockfish/pull/5909

No functional change
This commit is contained in:
Jake Senne
2025-02-20 22:53:16 -06:00
committed by Disservin
parent a730b4d08b
commit 6d9c6f99b9
1 changed files with 3 additions and 3 deletions
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6
src/position.cpp
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@@ -560,7 +560,7 @@ bool Position::legal(Move m) const {
// A non-king move is legal if and only if it is not pinned or it
// is moving along the ray towards or away from the king.
return !(blockers_for_king(us) & from) || aligned(from, to, square<KING>(us));
return !(blockers_for_king(us) & from) || line_bb(from, to) & pieces(us, KING);
}
@@ -648,7 +648,7 @@ bool Position::gives_check(Move m) const {
// Is there a discovered check?
if (blockers_for_king(~sideToMove) & from)
return !aligned(from, to, square<KING>(~sideToMove)) || m.type_of() == CASTLING;
return !(line_bb(from, to) & pieces(~sideToMove, KING) || m.type_of() == CASTLING);
switch (m.type_of())
{
@@ -656,7 +656,7 @@ bool Position::gives_check(Move m) const {
return false;
case PROMOTION :
return attacks_bb(m.promotion_type(), to, pieces() ^ from) & square<KING>(~sideToMove);
return attacks_bb(m.promotion_type(), to, pieces() ^ from) & pieces(~sideToMove, KING);
// En passant capture with check? We have already handled the case of direct
// checks and ordinary discovered check, so the only case we need to handle