Indentation fix in index()

No functional change.

Closes official-stockfish#1158

src/bitboard.cpp

@@ -251,6 +251,7 @@ namespace {
 
   void init_magics(Bitboard table[], Magic magics[], Square deltas[]) {
 
+    // Optimal PRNG seeds to pick the correct magics in the shortest time
     int seeds[][RANK_NB] = { { 8977, 44560, 54343, 38998,  5731, 95205, 104912, 17020 },
                              {  728, 10316, 55013, 32803, 12281, 15100,  16645,   255 } };
 

src/bitboard.h

@@ -83,18 +83,18 @@ struct Magic {
   Bitboard* attacks;
   unsigned  shift;
 
-  /// looks up the index using the 'magic bitboards' approach.
+  // Compute the attack's index using the 'magic bitboards' approach
   unsigned index(Bitboard occupied) const {
 
-      if (HasPext)
-          return unsigned(pext(occupied, mask));
+    if (HasPext)
+        return unsigned(pext(occupied, mask));
 
-      if (Is64Bit)
-          return unsigned(((occupied & mask) * magic) >> shift);
+    if (Is64Bit)
+        return unsigned(((occupied & mask) * magic) >> shift);
 
-      unsigned lo = unsigned(occupied) & unsigned(mask);
-      unsigned hi = unsigned(occupied >> 32) & unsigned(mask >> 32);
-      return (lo * unsigned(magic) ^ hi * unsigned(magic >> 32)) >> shift;
+    unsigned lo = unsigned(occupied) & unsigned(mask);
+    unsigned hi = unsigned(occupied >> 32) & unsigned(mask >> 32);
+    return (lo * unsigned(magic) ^ hi * unsigned(magic >> 32)) >> shift;
   }
 };
 
@@ -241,8 +241,8 @@ template<> inline int distance<Rank>(Square x, Square y) { return distance(rank_
 template<PieceType Pt>
 inline Bitboard attacks_bb(Square s, Bitboard occupied) {
 
-  const Magic& M = Pt == ROOK ? RookMagics[s] : BishopMagics[s];
-  return M.attacks[M.index(occupied)];
+  const Magic& m = Pt == ROOK ? RookMagics[s] : BishopMagics[s];
+  return m.attacks[m.index(occupied)];
 }
 
 inline Bitboard attacks_bb(PieceType pt, Square s, Bitboard occupied) {