Remove two useless calls to pinned_pieces()

[stockfish] / src / movegen.cpp

diff --git a/src/movegen.cpp b/src/movegen.cpp
index a002e19fe98c92b64f29e547143633ba619e1416..37e66724e5decd81e25a8eaecd552264f200e2c1 100644 (file)
--- a/src/movegen.cpp
+++ b/src/movegen.cpp
@@ -166,16 +166,17 @@ int generate_noncaptures(const Position& pos, MoveStack* mlist) {
 /// generate_checks() generates all pseudo-legal non-capturing, non-promoting
 /// checks. It returns the number of generated moves.
 
-int generate_checks(const Position& pos, MoveStack* mlist, Bitboard dc) {
+int generate_checks(const Position& pos, MoveStack* mlist) {
 
   assert(pos.is_ok());
   assert(!pos.is_check());
 
   Color us = pos.side_to_move();
   Square ksq = pos.king_square(opposite_color(us));
+  Bitboard dc = pos.discovered_check_candidates(us);
   MoveStack* mlist_start = mlist;
 
-  assert(pos.piece_on(ksq) == king_of_color(opposite_color(us)));
+  assert(pos.piece_on(ksq) == piece_of_color_and_type(opposite_color(us), KING));
 
   // Pieces moves
   mlist = generate_piece_checks<PAWN>(pos, mlist, us, dc, ksq);
@@ -204,7 +205,7 @@ int generate_checks(const Position& pos, MoveStack* mlist, Bitboard dc) {
 /// in check. Unlike the other move generation functions, this one generates
 /// only legal moves. It returns the number of generated moves.
 
-int generate_evasions(const Position& pos, MoveStack* mlist, Bitboard pinned) {
+int generate_evasions(const Position& pos, MoveStack* mlist) {
 
   assert(pos.is_ok());
   assert(pos.is_check());
@@ -215,7 +216,7 @@ int generate_evasions(const Position& pos, MoveStack* mlist, Bitboard pinned) {
   Square ksq = pos.king_square(us);
   MoveStack* mlist_start = mlist;
 
-  assert(pos.piece_on(ksq) == king_of_color(us));
+  assert(pos.piece_on(ksq) == piece_of_color_and_type(us, KING));
 
   // The bitboard of occupied pieces without our king
   Bitboard b_noKing = pos.occupied_squares();
@@ -258,6 +259,7 @@ int generate_evasions(const Position& pos, MoveStack* mlist, Bitboard pinned) {
   if (!(checkers & (checkers - 1))) // Only one bit set?
   {
       Square checksq = first_1(checkers);
+      Bitboard pinned = pos.pinned_pieces(us);
 
       assert(pos.color_of_piece_on(checksq) == them);
 
@@ -347,10 +349,8 @@ int generate_legal_moves(const Position& pos, MoveStack* mlist) {
 
   assert(pos.is_ok());
 
-  Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
-
   if (pos.is_check())
-      return generate_evasions(pos, mlist, pinned);
+      return generate_evasions(pos, mlist);
 
   // Generate pseudo-legal moves
   int n = generate_captures(pos, mlist);
@@ -358,7 +358,7 @@ int generate_legal_moves(const Position& pos, MoveStack* mlist) {
 
   // Remove illegal moves from the list
   for (int i = 0; i < n; i++)
-      if (!pos.pl_move_is_legal(mlist[i].move, pinned))
+      if (!pos.pl_move_is_legal(mlist[i].move))
           mlist[i--].move = mlist[--n].move;
 
   return n;
@@ -371,12 +371,11 @@ int generate_legal_moves(const Position& pos, MoveStack* mlist) {
 /// returned. If not, the function returns false.  This function must
 /// only be used when the side to move is not in check.
 
-bool move_is_legal(const Position& pos, const Move m, Bitboard pinned) {
+bool move_is_legal(const Position& pos, const Move m) {
 
   assert(pos.is_ok());
   assert(!pos.is_check());
   assert(move_is_ok(m));
-  assert(pinned == pos.pinned_pieces(pos.side_to_move()));
 
   Color us = pos.side_to_move();
   Color them = opposite_color(us);
@@ -400,10 +399,10 @@ bool move_is_legal(const Position& pos, const Move m, Bitboard pinned) {
           return false;
 
       assert(pos.square_is_empty(to));
-      assert(pos.piece_on(to - pawn_push(us)) == pawn_of_color(them));
+      assert(pos.piece_on(to - pawn_push(us)) == piece_of_color_and_type(them, PAWN));
 
       // The move is pseudo-legal, check if it is also legal
-      return pos.pl_move_is_legal(m, pinned);
+      return pos.pl_move_is_legal(m);
   }
 
   // Castling moves
@@ -417,7 +416,7 @@ bool move_is_legal(const Position& pos, const Move m, Bitboard pinned) {
 
       assert(from == pos.king_square(us));
       assert(to == pos.initial_kr_square(us));
-      assert(pos.piece_on(to) == rook_of_color(us));
+      assert(pos.piece_on(to) == piece_of_color_and_type(us, ROOK));
 
       Square g1 = relative_square(us, SQ_G1);
       Square f1 = relative_square(us, SQ_F1);
@@ -450,7 +449,7 @@ bool move_is_legal(const Position& pos, const Move m, Bitboard pinned) {
 
       assert(from == pos.king_square(us));
       assert(to == pos.initial_qr_square(us));
-      assert(pos.piece_on(to) == rook_of_color(us));
+      assert(pos.piece_on(to) == piece_of_color_and_type(us, ROOK));
 
       Square c1 = relative_square(us, SQ_C1);
       Square d1 = relative_square(us, SQ_D1);
@@ -535,12 +534,12 @@ bool move_is_legal(const Position& pos, const Move m, Bitboard pinned) {
           return false;
       }
       // The move is pseudo-legal, check if it is also legal
-      return pos.pl_move_is_legal(m, pinned);
+      return pos.pl_move_is_legal(m);
   }
 
   // Luckly we can handle all the other pieces in one go
   return (   pos.piece_attacks_square(pos.piece_on(from), from, to)
-          && pos.pl_move_is_legal(m, pinned)
+          && pos.pl_move_is_legal(m)
           && !move_promotion(m));
 }
 
@@ -866,7 +865,7 @@ namespace {
         Color them = opposite_color(us);
         Square ksq = pos.king_square(us);
 
-        assert(pos.piece_on(ksq) == king_of_color(us));
+        assert(pos.piece_on(ksq) == piece_of_color_and_type(us, KING));
 
         Square rsq = (Side == KING_SIDE ? pos.initial_kr_square(us) : pos.initial_qr_square(us));
         Square s1 = relative_square(us, Side == KING_SIDE ? SQ_G1 : SQ_C1);
@@ -874,7 +873,7 @@ namespace {
         Square s;
         bool illegal = false;
 
-        assert(pos.piece_on(rsq) == rook_of_color(us));
+        assert(pos.piece_on(rsq) == piece_of_color_and_type(us, ROOK));
 
         // It is a bit complicated to correctly handle Chess960
         for (s = Min(ksq, s1); s <= Max(ksq, s1); s++)