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Code Issues Releases Wiki Activity

simplify opposite_colors

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protonspring 2018-12-08 10:57:25 -07:00 • committed by Stéphane Nicolet
parent 5c2fbcd09b
commit fefc0c6789
2 changed files with 4 additions and 5 deletions
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4
src/bitboard.h
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@ -135,6 +135,10 @@ constexpr bool more_than_one(Bitboard b) {
return b & (b - 1); return b & (b - 1);
} }
inline bool opposite_colors(Square s1, Square s2) {
return bool(DarkSquares & s1) != bool(DarkSquares & s2);
}
/// rank_bb() and file_bb() return a bitboard representing all the squares on /// rank_bb() and file_bb() return a bitboard representing all the squares on
/// the given file or rank. /// the given file or rank.

5
src/types.h
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@ -413,11 +413,6 @@ constexpr Rank relative_rank(Color c, Square s) {
return relative_rank(c, rank_of(s)); return relative_rank(c, rank_of(s));
} }
inline bool opposite_colors(Square s1, Square s2) {
int s = int(s1) ^ int(s2);
return ((s >> 3) ^ s) & 1;
}
constexpr Direction pawn_push(Color c) { constexpr Direction pawn_push(Color c) {
return c == WHITE ? NORTH : SOUTH; return c == WHITE ? NORTH : SOUTH;
} }