Shrink castlePath[] and castleRookSquare[] sizes

[stockfish] / src / position.cpp

diff --git a/src/position.cpp b/src/position.cpp
index 62749a913b75cfaa5e317c43bd8879e7370009f6..60c5380d8352e329c2b662e218d75fbb885717cc 100644 (file)
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -96,13 +96,14 @@ CheckInfo::CheckInfo(const Position& pos) {
 /// object do not depend on any external data so we detach state pointer from
 /// the source one.
 
-Position& Position::operator=(const Position& pos) {
+void Position::operator=(const Position& pos) {
 
   memcpy(this, &pos, sizeof(Position));
   startState = *st;
   st = &startState;
   nodes = 0;
-  return *this;
+
+  assert(pos_is_ok());
 }
 
 
@@ -110,7 +111,7 @@ Position& Position::operator=(const Position& pos) {
 /// string. This function is not very robust - make sure that input FENs are
 /// correct (this is assumed to be the responsibility of the GUI).
 
-void Position::from_fen(const string& fenStr, bool isChess960) {
+void Position::from_fen(const string& fenStr, bool isChess960, Thread* th) {
 /*
    A FEN string defines a particular position using only the ASCII character set.
 
@@ -226,6 +227,7 @@ void Position::from_fen(const string& fenStr, bool isChess960) {
   st->npMaterial[BLACK] = compute_non_pawn_material(BLACK);
   st->checkersBB = attackers_to(king_square(sideToMove)) & pieces(~sideToMove);
   chess960 = isChess960;
+  thisThread = th;
 
   assert(pos_is_ok());
 }
@@ -237,24 +239,24 @@ void Position::from_fen(const string& fenStr, bool isChess960) {
 void Position::set_castle_right(Color c, Square rfrom) {
 
   Square kfrom = king_square(c);
-  bool kingSide = kfrom < rfrom;
-  int cr = (kingSide ? WHITE_OO : WHITE_OOO) << c;
+  CastlingSide cs = kfrom < rfrom ? KING_SIDE : QUEEN_SIDE;
+  int cr = (cs == KING_SIDE ? WHITE_OO : WHITE_OOO) << c;
 
   st->castleRights |= cr;
   castleRightsMask[kfrom] |= cr;
   castleRightsMask[rfrom] |= cr;
-  castleRookSquare[cr] = rfrom;
+  castleRookSquare[c][cs] = rfrom;
 
-  Square kto = relative_square(c, kingSide ? SQ_G1 : SQ_C1);
-  Square rto = relative_square(c, kingSide ? SQ_F1 : SQ_D1);
+  Square kto = relative_square(c, cs == KING_SIDE ? SQ_G1 : SQ_C1);
+  Square rto = relative_square(c, cs == KING_SIDE ? SQ_F1 : SQ_D1);
 
   for (Square s = std::min(rfrom, rto); s <= std::max(rfrom, rto); s++)
       if (s != kfrom && s != rfrom)
-          castlePath[cr] |= s;
+          castlePath[c][cs] |= s;
 
   for (Square s = std::min(kfrom, kto); s <= std::max(kfrom, kto); s++)
       if (s != kfrom && s != rfrom)
-          castlePath[cr] |= s;
+          castlePath[c][cs] |= s;
 }
 
 
@@ -298,16 +300,16 @@ const string Position::to_fen() const {
   fen << (sideToMove == WHITE ? " w " : " b ");
 
   if (can_castle(WHITE_OO))
-      fen << (chess960 ? char(toupper(file_to_char(file_of(castle_rook_square(WHITE_OO))))) : 'K');
+      fen << (chess960 ? char(toupper(file_to_char(file_of(castle_rook_square(WHITE, KING_SIDE))))) : 'K');
 
   if (can_castle(WHITE_OOO))
-      fen << (chess960 ? char(toupper(file_to_char(file_of(castle_rook_square(WHITE_OOO))))) : 'Q');
+      fen << (chess960 ? char(toupper(file_to_char(file_of(castle_rook_square(WHITE, QUEEN_SIDE))))) : 'Q');
 
   if (can_castle(BLACK_OO))
-      fen << (chess960 ? file_to_char(file_of(castle_rook_square(BLACK_OO))) : 'k');
+      fen << (chess960 ? file_to_char(file_of(castle_rook_square(BLACK, KING_SIDE))) : 'k');
 
   if (can_castle(BLACK_OOO))
-      fen << (chess960 ? file_to_char(file_of(castle_rook_square(BLACK_OOO))) : 'q');
+      fen << (chess960 ? file_to_char(file_of(castle_rook_square(BLACK, QUEEN_SIDE))) : 'q');
 
   if (st->castleRights == CASTLES_NONE)
       fen << '-';
@@ -895,8 +897,8 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
   }
 
   // Prefetch pawn and material hash tables
-  prefetch((char*)Threads.this_thread()->pawnTable.entries[st->pawnKey]);
-  prefetch((char*)Threads.this_thread()->materialTable.entries[st->materialKey]);
+  prefetch((char*)thisThread->pawnTable.entries[st->pawnKey]);
+  prefetch((char*)thisThread->materialTable.entries[st->materialKey]);
 
   // Update incremental scores
   st->psqScore += psq_delta(piece, from, to);
@@ -1537,45 +1539,37 @@ void Position::init() {
 
 void Position::flip() {
 
-  // Make a copy of current position before to start changing
   const Position pos(*this);
 
   clear();
 
-  // Board
+  sideToMove = ~pos.side_to_move();
+  thisThread = pos.this_thread();
+  nodes = pos.nodes_searched();
+  chess960 = pos.is_chess960();
+  startPosPly = pos.startpos_ply_counter();
+
   for (Square s = SQ_A1; s <= SQ_H8; s++)
       if (!pos.square_empty(s))
           put_piece(Piece(pos.piece_on(s) ^ 8), ~s);
 
-  // Side to move
-  sideToMove = ~pos.side_to_move();
-
-  // Castling rights
   if (pos.can_castle(WHITE_OO))
-      set_castle_right(BLACK, ~pos.castle_rook_square(WHITE_OO));
+      set_castle_right(BLACK, ~pos.castle_rook_square(WHITE, KING_SIDE));
   if (pos.can_castle(WHITE_OOO))
-      set_castle_right(BLACK, ~pos.castle_rook_square(WHITE_OOO));
+      set_castle_right(BLACK, ~pos.castle_rook_square(WHITE, QUEEN_SIDE));
   if (pos.can_castle(BLACK_OO))
-      set_castle_right(WHITE, ~pos.castle_rook_square(BLACK_OO));
+      set_castle_right(WHITE, ~pos.castle_rook_square(BLACK, KING_SIDE));
   if (pos.can_castle(BLACK_OOO))
-      set_castle_right(WHITE, ~pos.castle_rook_square(BLACK_OOO));
+      set_castle_right(WHITE, ~pos.castle_rook_square(BLACK, QUEEN_SIDE));
 
-  // En passant square
   if (pos.st->epSquare != SQ_NONE)
       st->epSquare = ~pos.st->epSquare;
 
-  // Checkers
-  st->checkersBB = attackers_to(king_square(sideToMove)) & pieces(~sideToMove);
-
-  // Hash keys
   st->key = compute_key();
   st->pawnKey = compute_pawn_key();
   st->materialKey = compute_material_key();
-
-  // Incremental scores
   st->psqScore = compute_psq_score();
-
-  // Material
+  st->checkersBB = attackers_to(king_square(sideToMove)) & pieces(~sideToMove);
   st->npMaterial[WHITE] = compute_non_pawn_material(WHITE);
   st->npMaterial[BLACK] = compute_non_pawn_material(BLACK);
 
@@ -1732,17 +1726,18 @@ bool Position::pos_is_ok(int* failedStep) const {
 
   if (failedStep) (*failedStep)++;
   if (debugCastleSquares)
-      for (CastleRight f = WHITE_OO; f <= BLACK_OOO; f = CastleRight(f << 1))
-      {
-          if (!can_castle(f))
-              continue;
+      for (Color c = WHITE; c <= BLACK; c++)
+          for (CastlingSide s = KING_SIDE; s <= QUEEN_SIDE; s = CastlingSide(s+1))
+          {
+              CastleRight cr = CastleRight((s == KING_SIDE ? WHITE_OO : WHITE_OOO) << c);
 
-          Piece rook = (f & (WHITE_OO | WHITE_OOO) ? W_ROOK : B_ROOK);
+              if (!can_castle(cr))
+                  continue;
 
-          if (   piece_on(castleRookSquare[f]) != rook
-              || castleRightsMask[castleRookSquare[f]] != f)
-              return false;
-      }
+              if (   piece_on(castleRookSquare[c][s]) != make_piece(c, ROOK)
+                  || castleRightsMask[castleRookSquare[c][s]] != cr)
+                  return false;
+          }
 
   if (failedStep) *failedStep = 0;
   return true;