X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.h;h=4236d07348d1dfcf97f11f4f681c04ea7fd38385;hp=f27340d9a0c5764a97c3c67ae7b443c53b4d307d;hb=9645e8e4e76aebc4b3099b20846c14e18768cab4;hpb=1f1ef0897c986ad5e761dd04a223ae9af6048b09

diff --git a/src/bitboard.h b/src/bitboard.h
index f27340d9..4236d073 100644
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -38,9 +38,6 @@
 
 const Bitboard EmptyBoardBB = 0ULL;
 
-const Bitboard WhiteSquaresBB = 0x55AA55AA55AA55AAULL;
-const Bitboard BlackSquaresBB = 0xAA55AA55AA55AA55ULL;
-
 const Bitboard FileABB = 0x0101010101010101ULL;
 const Bitboard FileBBB = 0x0202020202020202ULL;
 const Bitboard FileCBB = 0x0404040404040404ULL;
@@ -76,7 +73,7 @@ extern Bitboard BetweenBB[64][64];
 
 extern Bitboard SquaresInFrontMask[2][64];
 extern Bitboard PassedPawnMask[2][64];
-extern Bitboard OutpostMask[2][64];
+extern Bitboard AttackSpanMask[2][64];
 
 extern const uint64_t RMult[64];
 extern const int RShift[64];
@@ -128,9 +125,8 @@ inline void do_move_bb(Bitboard *b, Bitboard move_bb) {
   *b ^= move_bb;
 }
 
-/// rank_bb() and file_bb() gives a bitboard containing all squares on a given
-/// file or rank.  It is also possible to pass a square as input to these
-/// functions.
+/// rank_bb() and file_bb() take a file or a square as input, and return
+/// a bitboard representing all squares on the given file or rank.
 
 inline Bitboard rank_bb(Rank r) {
   return RankBB[r];
@@ -301,13 +297,13 @@ inline Bitboard passed_pawn_mask(Color c, Square s) {
 }
 
 
-/// outpost_mask takes a color and a square as input, and returns a bitboard
-/// mask which can be used to test whether a piece on the square can possibly
-/// be driven away by an enemy pawn. Definition of the table is:
-/// OutpostMask[c][s] = in_front_bb(c, s) & neighboring_files_bb(s);
+/// attack_span_mask takes a color and a square as input, and returns a bitboard
+/// representing all squares that can be attacked by a pawn of the given color
+/// when it moves along its file starting from the given square. Definition is:
+/// AttackSpanMask[c][s] = in_front_bb(c, s) & neighboring_files_bb(s);
 
-inline Bitboard outpost_mask(Color c, Square s) {
-  return OutpostMask[c][s];
+inline Bitboard attack_span_mask(Color c, Square s) {
+  return AttackSpanMask[c][s];
 }
 
 
@@ -343,7 +339,6 @@ extern Square pop_1st_bit(Bitboard* b);
 
 extern void print_bitboard(Bitboard b);
 extern void init_bitboards();
-extern int bitScanReverse32(uint32_t b);
 
 
 #endif // !defined(BITBOARD_H_INCLUDED)