X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fposition.cpp;h=fbde810b503bc26f4574824bb9d4dd3e673236eb;hp=901e91a70f2f93d49191aa9e2c65e38d8c9e653f;hb=aec918a2b6ee931826ef19db1726950976da7ffe;hpb=9c7dc057d160d7f3c41553173f958f2cc7b5d98c

diff --git a/src/position.cpp b/src/position.cpp
index 901e91a7..fbde810b 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -55,13 +55,13 @@ constexpr Piece Pieces[] = { W_PAWN, W_KNIGHT, W_BISHOP, W_ROOK, W_QUEEN, W_KING
 // valuable attacker for the side to move, remove the attacker we just found
 // from the bitboards and scan for new X-ray attacks behind it.
 
-template<int Pt>
+template<PieceType Pt>
 PieceType min_attacker(const Bitboard* byTypeBB, Square to, Bitboard stmAttackers,
                        Bitboard& occupied, Bitboard& attackers) {
 
   Bitboard b = stmAttackers & byTypeBB[Pt];
   if (!b)
-      return min_attacker<Pt + 1>(byTypeBB, to, stmAttackers, occupied, attackers);
+      return min_attacker<PieceType(Pt + 1)>(byTypeBB, to, stmAttackers, occupied, attackers);
 
   occupied ^= lsb(b); // Remove the attacker from occupied
 
@@ -77,7 +77,7 @@ PieceType min_attacker(const Bitboard* byTypeBB, Square to, Bitboard stmAttacker
   // X-ray may add already processed pieces because byTypeBB[] is constant: in
   // the rook example, now attackers contains _again_ rook in a7, so remove it.
   attackers &= occupied;
-  return (PieceType)Pt;
+  return Pt;
 }
 
 template<>
@@ -383,6 +383,12 @@ void Position::set_state(StateInfo* si) const {
       Square s = pop_lsb(&b);
       Piece pc = piece_on(s);
       si->key ^= Zobrist::psq[pc][s];
+
+      if (type_of(pc) == PAWN)
+          si->pawnKey ^= Zobrist::psq[pc][s];
+
+      else if (type_of(pc) != KING)
+          si->nonPawnMaterial[color_of(pc)] += PieceValue[MG][pc];
   }
 
   if (si->epSquare != SQ_NONE)
@@ -393,20 +399,9 @@ void Position::set_state(StateInfo* si) const {
 
   si->key ^= Zobrist::castling[si->castlingRights];
 
-  for (Bitboard b = pieces(PAWN); b; )
-  {
-      Square s = pop_lsb(&b);
-      si->pawnKey ^= Zobrist::psq[piece_on(s)][s];
-  }
-
   for (Piece pc : Pieces)
-  {
-      if (type_of(pc) != PAWN && type_of(pc) != KING)
-          si->nonPawnMaterial[color_of(pc)] += pieceCount[pc] * PieceValue[MG][pc];
-
       for (int cnt = 0; cnt < pieceCount[pc]; ++cnt)
           si->materialKey ^= Zobrist::psq[pc][cnt];
-  }
 }
 
 
@@ -496,7 +491,7 @@ Bitboard Position::slider_blockers(Bitboard sliders, Square s, Bitboard& pinners
   // Snipers are sliders that attack 's' when a piece and other snipers are removed
   Bitboard snipers = (  (PseudoAttacks[  ROOK][s] & pieces(QUEEN, ROOK))
                       | (PseudoAttacks[BISHOP][s] & pieces(QUEEN, BISHOP))) & sliders;
-  Bitboard occupancy = pieces() & ~snipers;
+  Bitboard occupancy = pieces() ^ snipers;
 
   while (snipers)
   {
@@ -1194,16 +1189,13 @@ bool Position::has_game_cycle(int ply) const {
 
           if (!(between_bb(s1, s2) & pieces()))
           {
-              // In the cuckoo table, both moves Rc1c5 and Rc5c1 are stored in the same
-              // location. We select the legal one by reversing the move variable if necessary.
-              if (empty(s1))
-                  move = make_move(s2, s1);
-
               if (ply > i)
                   return true;
 
-              // For nodes before or at the root, check that the move is a repetition one
-              // rather than a move to the current position
+              // For nodes before or at the root, check that the move is a
+              // repetition rather than a move to the current position.
+              // In the cuckoo table, both moves Rc1c5 and Rc5c1 are stored in
+              // the same location, so we have to select which square to check.
               if (color_of(piece_on(empty(s1) ? s2 : s1)) != side_to_move())
                   continue;
 
@@ -1307,8 +1299,8 @@ bool Position::pos_is_ok() const {
               assert(0 && "pos_is_ok: Index");
   }
 
-  for (Color c = WHITE; c <= BLACK; ++c)
-      for (CastlingSide s = KING_SIDE; s <= QUEEN_SIDE; s = CastlingSide(s + 1))
+  for (Color c : { WHITE, BLACK })
+      for (CastlingSide s : {KING_SIDE, QUEEN_SIDE})
       {
           if (!can_castle(c | s))
               continue;