Use int8_t instead of int for SquareDistance[]

[stockfish] / src / bitboard.h

diff --git a/src/bitboard.h b/src/bitboard.h
index 37585bb19b18e8e25feb54120429b3177caa6da6..b64c92e1a4c54107ef2088ddf43d69c9cafc6871 100644 (file)
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -60,12 +60,11 @@ constexpr Bitboard Rank6BB = Rank1BB << (8 * 5);
 constexpr Bitboard Rank7BB = Rank1BB << (8 * 6);
 constexpr Bitboard Rank8BB = Rank1BB << (8 * 7);
 
-extern int SquareDistance[SQUARE_NB][SQUARE_NB];
+extern int8_t SquareDistance[SQUARE_NB][SQUARE_NB];
 
 extern Bitboard SquareBB[SQUARE_NB];
 extern Bitboard FileBB[FILE_NB];
 extern Bitboard RankBB[RANK_NB];
-extern Bitboard AdjacentFilesBB[FILE_NB];
 extern Bitboard ForwardRanksBB[COLOR_NB][RANK_NB];
 extern Bitboard BetweenBB[SQUARE_NB][SQUARE_NB];
 extern Bitboard LineBB[SQUARE_NB][SQUARE_NB];
@@ -136,7 +135,7 @@ constexpr bool more_than_one(Bitboard b) {
 }
 
 inline bool opposite_colors(Square s1, Square s2) {
-  return (bool(DarkSquares & s1) != bool(DarkSquares & s2));
+  return bool(DarkSquares & s1) != bool(DarkSquares & s2);
 }
 
 /// rank_bb() and file_bb() return a bitboard representing all the squares on
@@ -195,7 +194,7 @@ constexpr Bitboard double_pawn_attacks_bb(Bitboard b) {
 /// adjacent files of the given one.
 
 inline Bitboard adjacent_files_bb(File f) {
-  return AdjacentFilesBB[f];
+  return shift<EAST>(FileBB[f]) | shift<WEST>(FileBB[f]);
 }