X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.cpp;h=425dc8ad796207cdfa6f79c0b0055abb61259619;hp=e3fc93cc8e2ad7823e0b77d8ff4e04df82716e53;hb=e304db9d1ecf6a2318708483c90fadecf4fac4ee;hpb=0c6ed5929cb875e1507569424ab13036c5214f9b

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index e3fc93cc..425dc8ad 100644
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -23,54 +23,62 @@
 
 #include "bitboard.h"
 #include "bitcount.h"
+#include "misc.h"
 #include "rkiss.h"
 
 CACHE_LINE_ALIGNMENT
 
-Bitboard RMasks[64];
-Bitboard RMagics[64];
-Bitboard* RAttacks[64];
-unsigned RShifts[64];
-
-Bitboard BMasks[64];
-Bitboard BMagics[64];
-Bitboard* BAttacks[64];
-unsigned BShifts[64];
-
-Bitboard SquareBB[64];
-Bitboard FileBB[8];
-Bitboard RankBB[8];
-Bitboard AdjacentFilesBB[8];
-Bitboard ThisAndAdjacentFilesBB[8];
-Bitboard InFrontBB[2][8];
-Bitboard StepAttacksBB[16][64];
-Bitboard BetweenBB[64][64];
-Bitboard DistanceRingsBB[64][8];
-Bitboard ForwardBB[2][64];
-Bitboard PassedPawnMask[2][64];
-Bitboard AttackSpanMask[2][64];
-Bitboard PseudoAttacks[6][64];
-
-int SquareDistance[64][64];
+Bitboard RMasks[SQUARE_NB];
+Bitboard RMagics[SQUARE_NB];
+Bitboard* RAttacks[SQUARE_NB];
+unsigned RShifts[SQUARE_NB];
+
+Bitboard BMasks[SQUARE_NB];
+Bitboard BMagics[SQUARE_NB];
+Bitboard* BAttacks[SQUARE_NB];
+unsigned BShifts[SQUARE_NB];
+
+Bitboard SquareBB[SQUARE_NB];
+Bitboard FileBB[FILE_NB];
+Bitboard RankBB[RANK_NB];
+Bitboard AdjacentFilesBB[FILE_NB];
+Bitboard ThisAndAdjacentFilesBB[FILE_NB];
+Bitboard InFrontBB[COLOR_NB][RANK_NB];
+Bitboard StepAttacksBB[PIECE_NB][SQUARE_NB];
+Bitboard BetweenBB[SQUARE_NB][SQUARE_NB];
+Bitboard DistanceRingsBB[SQUARE_NB][8];
+Bitboard ForwardBB[COLOR_NB][SQUARE_NB];
+Bitboard PassedPawnMask[COLOR_NB][SQUARE_NB];
+Bitboard AttackSpanMask[COLOR_NB][SQUARE_NB];
+Bitboard PseudoAttacks[PIECE_TYPE_NB][SQUARE_NB];
+
+int SquareDistance[SQUARE_NB][SQUARE_NB];
 
 namespace {
 
   // De Bruijn sequences. See chessprogramming.wikispaces.com/BitScan
-  const uint64_t DeBruijn_64 = 0x218A392CD3D5DBFULL;
+  const uint64_t DeBruijn_64 = 0x3F79D71B4CB0A89ULL;
   const uint32_t DeBruijn_32 = 0x783A9B23;
 
   CACHE_LINE_ALIGNMENT
 
-  int BSFTable[64];
   int MS1BTable[256];
+  Square BSFTable[SQUARE_NB];
   Bitboard RTable[0x19000]; // Storage space for rook attacks
   Bitboard BTable[0x1480];  // Storage space for bishop attacks
-  uint8_t BitCount8Bit[256];
 
   typedef unsigned (Fn)(Square, Bitboard);
 
   void init_magics(Bitboard table[], Bitboard* attacks[], Bitboard magics[],
                    Bitboard masks[], unsigned shifts[], Square deltas[], Fn index);
+
+  FORCE_INLINE unsigned bsf_index(Bitboard b) {
+
+    // Matt Taylor's folding for 32 bit systems, extended to 64 bits by Kim Walisch
+    b ^= (b - 1);
+    return Is64Bit ? (b * DeBruijn_64) >> 58
+                   : ((unsigned(b) ^ unsigned(b >> 32)) * DeBruijn_32) >> 26;
+  }
 }
 
 /// lsb()/msb() finds the least/most significant bit in a nonzero bitboard.
@@ -78,27 +86,13 @@ namespace {
 
 #if !defined(USE_BSFQ)
 
-Square lsb(Bitboard b) {
-
-  if (Is64Bit)
-      return Square(BSFTable[((b & -b) * DeBruijn_64) >> 58]);
-
-  b ^= (b - 1);
-  uint32_t fold = unsigned(b) ^ unsigned(b >> 32);
-  return Square(BSFTable[(fold * DeBruijn_32) >> 26]);
-}
+Square lsb(Bitboard b) { return BSFTable[bsf_index(b)]; }
 
 Square pop_lsb(Bitboard* b) {
 
   Bitboard bb = *b;
   *b = bb & (bb - 1);
-
-  if (Is64Bit)
-      return Square(BSFTable[((bb & -bb) * DeBruijn_64) >> 58]);
-
-  bb ^= (bb - 1);
-  uint32_t fold = unsigned(bb) ^ unsigned(bb >> 32);
-  return Square(BSFTable[(fold * DeBruijn_32) >> 26]);
+  return BSFTable[bsf_index(bb)];
 }
 
 Square msb(Bitboard b) {
@@ -126,7 +120,7 @@ Square msb(Bitboard b) {
       result += 8;
   }
 
-  return Square(result + MS1BTable[b32]);
+  return (Square)(result + MS1BTable[b32]);
 }
 
 #endif // !defined(USE_BSFQ)
@@ -137,6 +131,8 @@ Square msb(Bitboard b) {
 
 void Bitboards::print(Bitboard b) {
 
+  sync_cout;
+
   for (Rank rank = RANK_8; rank >= RANK_1; rank--)
   {
       std::cout << "+---+---+---+---+---+---+---+---+" << '\n';
@@ -146,7 +142,7 @@ void Bitboards::print(Bitboard b) {
 
       std::cout << "|\n";
   }
-  std::cout << "+---+---+---+---+---+---+---+---+" << std::endl;
+  std::cout << "+---+---+---+---+---+---+---+---+" << sync_endl;
 }
 
 
@@ -159,8 +155,8 @@ void Bitboards::init() {
       while (k < (2 << i))
           MS1BTable[k++] = i;
 
-  for (Bitboard b = 0; b < 256; b++)
-      BitCount8Bit[b] = (uint8_t)popcount<Max15>(b);
+  for (int i = 0; i < 64; i++)
+      BSFTable[bsf_index(1ULL << i)] = Square(i);
 
   for (Square s = SQ_A1; s <= SQ_H8; s++)
       SquareBB[s] = 1ULL << s;
@@ -201,17 +197,6 @@ void Bitboards::init() {
               if (SquareDistance[s1][s2] == d)
                   DistanceRingsBB[s1][d - 1] |= s2;
 
-  for (int i = 0; i < 64; i++)
-      if (!Is64Bit) // Matt Taylor's folding trick for 32 bit systems
-      {
-          Bitboard b = 1ULL << i;
-          b ^= b - 1;
-          b ^= b >> 32;
-          BSFTable[(uint32_t)(b * DeBruijn_32) >> 26] = i;
-      }
-      else
-          BSFTable[((1ULL << i) * DeBruijn_64) >> 58] = i;
-
   int steps[][9] = { {}, { 7, 9 }, { 17, 15, 10, 6, -6, -10, -15, -17 },
                      {}, {}, {}, { 9, 7, -7, -9, 8, 1, -1, -8 } };
 
@@ -335,7 +320,7 @@ namespace {
         // until we find the one that passes the verification test.
         do {
             do magics[s] = pick_random(rk, booster);
-            while (BitCount8Bit[(magics[s] * masks[s]) >> 56] < 6);
+            while (popcount<Max15>((magics[s] * masks[s]) >> 56) < 6);
 
             memset(attacks[s], 0, size * sizeof(Bitboard));