Retire SquaresByColorBB[] and enum SquareColor

[stockfish] / src / bitboard.cpp

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index 794f54cf68326cf92fec7ff172a1f1959eaa62d2..d9a9daba8b854d4ebdcdb2c3701ff2e38cdb386d 100644 (file)
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -38,7 +38,6 @@ int BShifts[64];
 Bitboard SetMaskBB[65];
 Bitboard ClearMaskBB[65];
 
-Bitboard SquaresByColorBB[2];
 Bitboard FileBB[8];
 Bitboard RankBB[8];
 Bitboard NeighboringFilesBB[8];
@@ -157,16 +156,13 @@ void bitboards_init() {
   for (Bitboard b = 0; b < 256; b++)
       BitCount8Bit[b] = (uint8_t)count_1s<CNT32_MAX15>(b);
 
-  SquaresByColorBB[DARK]  =  0xAA55AA55AA55AA55ULL;
-  SquaresByColorBB[LIGHT] = ~SquaresByColorBB[DARK];
-
   for (Square s = SQ_A1; s <= SQ_H8; s++)
   {
       SetMaskBB[s] = 1ULL << s;
       ClearMaskBB[s] = ~SetMaskBB[s];
   }
 
-  ClearMaskBB[SQ_NONE] = ~EmptyBoardBB;
+  ClearMaskBB[SQ_NONE] = ~0ULL;
 
   FileBB[FILE_A] = FileABB;
   RankBB[RANK_1] = Rank1BB;
@@ -231,9 +227,9 @@ void bitboards_init() {
 
   for (Square s = SQ_A1; s <= SQ_H8; s++)
   {
-      BishopPseudoAttacks[s] = bishop_attacks_bb(s, EmptyBoardBB);
-      RookPseudoAttacks[s]   = rook_attacks_bb(s, EmptyBoardBB);
-      QueenPseudoAttacks[s]  = queen_attacks_bb(s, EmptyBoardBB);
+      BishopPseudoAttacks[s] = bishop_attacks_bb(s, 0);
+      RookPseudoAttacks[s]   = rook_attacks_bb(s, 0);
+      QueenPseudoAttacks[s]  = queen_attacks_bb(s, 0);
   }
 
   for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
@@ -324,7 +320,7 @@ namespace {
         // all the attacks for each possible subset of the mask and so is 2 power
         // the number of 1s of the mask. Hence we deduce the size of the shift to
         // apply to the 64 or 32 bits word to get the index.
-        masks[s]  = sliding_attacks(pt, s, EmptyBoardBB) & ~edges;
+        masks[s]  = sliding_attacks(pt, s, 0) & ~edges;
         shifts[s] = (CpuIs64Bit ? 64 : 32) - count_1s<CNT32_MAX15>(masks[s]);
 
         // Use Carry-Rippler trick to enumerate all subsets of masks[s] and