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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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9
src/bitboard.h
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@ -319,9 +319,10 @@ extern Square pop_lsb(Bitboard* b);
#endif
/// lsb() overload finds least significant bit relative to the given color
inline Square lsb(Color c, Bitboard b) {
return c == WHITE ? lsb(b) : msb(b);
}
/// frontmost_sq() and backmost_sq() find the square corresponding to the
/// most/least advanced bit relative to the given color.
inline Square frontmost_sq(Color c, Bitboard b) { return c == WHITE ? msb(b) : lsb(b); }
inline Square backmost_sq(Color c, Bitboard b) { return c == WHITE ? lsb(b) : msb(b); }
#endif // #ifndef BITBOARD_H_INCLUDED

7
src/endgame.cpp
View file

@ -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);

4
src/pawns.cpp
View file

@ -229,11 +229,11 @@ Value Entry::shelter_storm(const Position& pos, Square ksq) {
for (int f = kf - 1; f <= kf + 1; f++)
{
b = ourPawns & FileBB[f];
rkUs = b ? relative_rank(Us, lsb(Us, b)) : RANK_1;
rkUs = b ? relative_rank(Us, backmost_sq(Us, b)) : RANK_1;
safety -= ShelterWeakness[rkUs];
b = theirPawns & FileBB[f];
rkThem = b ? relative_rank(Us, lsb(Us, b)) : RANK_1;
rkThem = b ? relative_rank(Us, frontmost_sq(Them, b)) : RANK_1;
safety -= StormDanger[rkUs == RANK_1 ? 0 : rkThem == rkUs + 1 ? 2 : 1][rkThem];
}