X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;ds=sidebyside;f=src%2Fbitboard.cpp;h=3bb3ff8f8d5777ab0aa9ccf9e3928d3e94280051;hb=d0cb9b286f4d7415be002855201e75340c8adef0;hp=bb03dfebf289d3e099420a56528f2fc418654a81;hpb=209e94203f8c4d0a48405192d1e71c80f28f3159;p=stockfish

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index bb03dfeb..3bb3ff8f 100644
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -56,8 +56,9 @@ const std::string Bitboards::pretty(Bitboard b) {
       for (File f = FILE_A; f <= FILE_H; ++f)
           s += b & make_square(f, r) ? "| X " : "|   ";
 
-      s += "|\n+---+---+---+---+---+---+---+---+\n";
+      s += "| " + std::to_string(1 + r) + "\n+---+---+---+---+---+---+---+---+\n";
   }
+  s += "  a   b   c   d   e   f   g   h\n";
 
   return s;
 }
@@ -69,7 +70,7 @@ const std::string Bitboards::pretty(Bitboard b) {
 void Bitboards::init() {
 
   for (unsigned i = 0; i < (1 << 16); ++i)
-      PopCnt16[i] = std::bitset<16>(i).count();
+      PopCnt16[i] = uint8_t(std::bitset<16>(i).count());
 
   for (Square s = SQ_A1; s <= SQ_H8; ++s)
       SquareBB[s] = (1ULL << s);
@@ -84,23 +85,16 @@ void Bitboards::init() {
   init_magics(RookTable, RookMagics, RookDirections);
   init_magics(BishopTable, BishopMagics, BishopDirections);
 
-  // Helper returning the target bitboard of a step from a square
-  auto landing_square_bb = [&](Square s, int step)
-  {
-      Square to = Square(s + step);
-      return is_ok(to) && distance(s, to) <= 2 ? square_bb(to) : Bitboard(0);
-  };
-
   for (Square s1 = SQ_A1; s1 <= SQ_H8; ++s1)
   {
       PawnAttacks[WHITE][s1] = pawn_attacks_bb<WHITE>(square_bb(s1));
       PawnAttacks[BLACK][s1] = pawn_attacks_bb<BLACK>(square_bb(s1));
 
       for (int step : {-9, -8, -7, -1, 1, 7, 8, 9} )
-         PseudoAttacks[KING][s1] |= landing_square_bb(s1, step);
+         PseudoAttacks[KING][s1] |= safe_destination(s1, step);
 
       for (int step : {-17, -15, -10, -6, 6, 10, 15, 17} )
-         PseudoAttacks[KNIGHT][s1] |= landing_square_bb(s1, step);
+         PseudoAttacks[KNIGHT][s1] |= safe_destination(s1, step);
 
       PseudoAttacks[QUEEN][s1]  = PseudoAttacks[BISHOP][s1] = attacks_bb<BISHOP>(s1, 0);
       PseudoAttacks[QUEEN][s1] |= PseudoAttacks[  ROOK][s1] = attacks_bb<  ROOK>(s1, 0);
@@ -117,20 +111,16 @@ namespace {
 
   Bitboard sliding_attack(Direction directions[], Square sq, Bitboard occupied) {
 
-    Bitboard attack = 0;
+    Bitboard attacks = 0;
 
     for (int i = 0; i < 4; ++i)
-        for (Square s = sq + directions[i];
-             is_ok(s) && distance(s, s - directions[i]) == 1;
-             s += directions[i])
-        {
-            attack |= s;
-
-            if (occupied & s)
-                break;
-        }
+    {
+        Square s = sq;
+        while(safe_destination(s, directions[i]) && !(occupied & s))
+            attacks |= (s += directions[i]);
+    }
 
-    return attack;
+    return attacks;
   }