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Use frontmost_sq() and backmost_sq helpers

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Should easier to read than the lsb() / msb() low
level functions.

No functional change.
This commit is contained in:
Marco Costalba
2013-08-30 07:05:25 +02:00
parent 5d90c149b5
commit 14f47c8ac6
3 changed files with 11 additions and 9 deletions
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7
src/endgame.cpp
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@@ -443,11 +443,12 @@ ScaleFactor Endgame<KBPsK>::operator()(const Position& pos) const {
// The bishop has the wrong color, and the defending king is on the
// file of the pawn(s) or the adjacent file. Find the rank of the
// frontmost pawn.
Rank rank = relative_rank(strongerSide, lsb(weakerSide, pawns));
Square pawnSq = frontmost_sq(strongerSide, pawns);
// If the defending king has distance 1 to the promotion square or
// is placed somewhere in front of the pawn, it's a draw.
if ( square_distance(kingSq, queeningSq) <= 1
|| relative_rank(strongerSide, kingSq) >= rank)
|| relative_rank(weakerSide, kingSq) <= relative_rank(weakerSide, pawnSq))
return SCALE_FACTOR_DRAW;
}
}
@@ -459,7 +460,7 @@ ScaleFactor Endgame<KBPsK>::operator()(const Position& pos) const {
&& pos.count<PAWN>(weakerSide) >= 1)
{
// Get weakerSide pawn that is closest to home rank
Square weakerPawnSq = lsb(weakerSide, pos.pieces(weakerSide, PAWN));
Square weakerPawnSq = backmost_sq(weakerSide, pos.pieces(weakerSide, PAWN));
Square strongerKingSq = pos.king_square(strongerSide);
Square weakerKingSq = pos.king_square(weakerSide);