Microptimize MoveList loop

[stockfish] / src / position.cpp

diff --git a/src/position.cpp b/src/position.cpp
index 1b2defa54662a34718bb46c79e40ae9abffbe595..1a8c7e00d6a0bc24af2e44c395a70fb9eb6c1d4b 100644 (file)
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -408,8 +408,8 @@ const string Position::pretty(Move move) const {
       ss << square_to_string(pop_lsb(&b)) << " ";
 
   ss << "\nLegal moves: ";
-  for (MoveList<LEGAL> ml(*this); !ml.end(); ++ml)
-      ss << move_to_san(*const_cast<Position*>(this), ml.move()) << " ";
+  for (MoveList<LEGAL> it(*this); *it; ++it)
+      ss << move_to_san(*const_cast<Position*>(this), *it) << " ";
 
   return ss.str();
 }
@@ -1129,10 +1129,10 @@ void Position::undo_null_move() {
 
 
 /// Position::see() is a static exchange evaluator: It tries to estimate the
-/// material gain or loss resulting from a move. There are three versions of
-/// this function: One which takes a destination square as input, one takes a
-/// move, and one which takes a 'from' and a 'to' square. The function does
-/// not yet understand promotions captures.
+/// material gain or loss resulting from a move. Parameter 'asymmThreshold' takes
+/// tempi into account. If the side who initiated the capturing sequence does the
+/// last capture, he loses a tempo and if the result is below 'asymmThreshold'
+/// the capturing sequence is considered bad.
 
 int Position::see_sign(Move m) const {
 
@@ -1147,22 +1147,7 @@ int Position::see_sign(Move m) const {
   return see(m);
 }
 
-int Position::see(Move m) const {
-  return do_see<false>(m, 0);
-}
-
-/// Position::see_asymm() takes tempi into account.
-/// If the side who initiated the capturing sequence does the last capture,
-/// he loses a tempo. In this case if the result is below asymmThreshold 
-/// the capturing sequence is considered bad.
-
-int Position::see_asymm(Move m, int asymmThreshold) const
-{
-  return do_see<true>(m, asymmThreshold);
-}
-
-template <bool Asymmetric>
-int Position::do_see(Move m, int asymmThreshold) const {
+int Position::see(Move m, int asymmThreshold) const {
 
   Square from, to;
   Bitboard occupied, attackers, stmAttackers;
@@ -1240,16 +1225,13 @@ int Position::do_see(Move m, int asymmThreshold) const {
   } while (stmAttackers);
 
   // If we are doing asymmetric SEE evaluation and the same side does the first
-  // and the last capture, he loses a tempo and gain must be at least worth "asymmThreshold".
-  // If not, we replace the score with a very low value, before negamaxing.
-  if (Asymmetric)
-  {
-      for (int i = 0; i < slIndex ; i += 2)
-      {
+  // and the last capture, he loses a tempo and gain must be at least worth
+  // 'asymmThreshold', otherwise we replace the score with a very low value,
+  // before negamaxing.
+  if (asymmThreshold)
+      for (int i = 0; i < slIndex; i += 2)
           if (swapList[i] < asymmThreshold)
-               swapList[i] = - QueenValueMg * 16;
-      }
-  }
+              swapList[i] = - QueenValueMg * 16;
 
   // Having built the swap list, we negamax through it to find the best
   // achievable score from the point of view of the side to move.
@@ -1394,7 +1376,6 @@ Value Position::compute_non_pawn_material(Color c) const {
 /// Position::is_draw() tests whether the position is drawn by material,
 /// repetition, or the 50 moves rule. It does not detect stalemates, this
 /// must be done by the search.
-template<bool SkipRepetition>
 bool Position::is_draw() const {
 
   // Draw by material?
@@ -1407,33 +1388,26 @@ bool Position::is_draw() const {
       return true;
 
   // Draw by repetition?
-  if (!SkipRepetition)
-  {
-      int i = 4, e = std::min(st->rule50, st->pliesFromNull);
+  int i = 4, e = std::min(st->rule50, st->pliesFromNull);
 
-      if (i <= e)
-      {
-          StateInfo* stp = st->previous->previous;
+  if (i <= e)
+  {
+      StateInfo* stp = st->previous->previous;
 
-          do {
-              stp = stp->previous->previous;
+      do {
+          stp = stp->previous->previous;
 
-              if (stp->key == st->key)
-                  return true;
+          if (stp->key == st->key)
+              return true;
 
-              i += 2;
+          i += 2;
 
-          } while (i <= e);
-      }
+      } while (i <= e);
   }
 
   return false;
 }
 
-// Explicit template instantiations
-template bool Position::is_draw<false>() const;
-template bool Position::is_draw<true>() const;
-
 
 /// Position::flip() flips position with the white and black sides reversed. This
 /// is only useful for debugging especially for finding evaluation symmetry bugs.