X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovepick.cpp;h=2b20f25f002447861a6deeddbf6260af21114c2b;hp=208007cca24e84d7a54ac0ef1c4844b23e844161;hb=f2e78d9f841b53b8d512ad2687ff982cf841df58;hpb=351ef5c85b6d4b9c71e9da367f0be5ab6e6f8117

diff --git a/src/movepick.cpp b/src/movepick.cpp
index 208007cc..2b20f25f 100644
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -18,6 +18,7 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <algorithm>
 #include <cassert>
 
 #include "movegen.h"
@@ -49,6 +50,19 @@ namespace {
   const uint8_t QsearchWithoutChecksTable[] = { PH_TT_MOVE, PH_QCAPTURES, PH_STOP };
   const uint8_t QsearchRecapturesTable[] = { PH_TT_MOVE, PH_QRECAPTURES, PH_STOP };
   const uint8_t ProbCutTable[] = { PH_TT_MOVE, PH_GOOD_PROBCUT, PH_STOP };
+
+  // Unary predicate used by std::partition to split positive scores from remaining
+  // ones so to sort separately the two sets, and with the second sort delayed.
+  inline bool has_positive_score(const MoveStack& move) { return move.score > 0; }
+
+  // Picks and pushes to the front the best move in range [firstMove, lastMove),
+  // it is faster than sorting all the moves in advance when moves are few, as
+  // normally are the possible captures.
+  inline MoveStack* pick_best(MoveStack* firstMove, MoveStack* lastMove)
+  {
+      std::swap(*firstMove, *std::max_element(firstMove, lastMove));
+      return firstMove;
+  }
 }
 
 /// Constructors for the MovePicker class. As arguments we pass information
@@ -82,7 +96,7 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h,
       phasePtr = MainSearchTable;
   }
 
-  ttMove = (ttm && pos.move_is_pl(ttm) ? ttm : MOVE_NONE);
+  ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
   phasePtr += int(ttMove == MOVE_NONE) - 1;
   go_next_phase();
 }
@@ -103,7 +117,7 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h, S
       // Skip TT move if is not a capture or a promotion, this avoids
       // qsearch tree explosion due to a possible perpetual check or
       // similar rare cases when TT table is full.
-      if (ttm != MOVE_NONE && !pos.move_is_capture_or_promotion(ttm))
+      if (ttm != MOVE_NONE && !pos.is_capture_or_promotion(ttm))
           ttm = MOVE_NONE;
   }
   else
@@ -113,7 +127,7 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h, S
       ttm = MOVE_NONE;
   }
 
-  ttMove = (ttm && pos.move_is_pl(ttm) ? ttm : MOVE_NONE);
+  ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
   phasePtr += int(ttMove == MOVE_NONE) - 1;
   go_next_phase();
 }
@@ -124,14 +138,14 @@ MovePicker::MovePicker(const Position& p, Move ttm, const History& h, PieceType
   assert (!pos.in_check());
 
   // In ProbCut we consider only captures better than parent's move
-  captureThreshold = piece_value_midgame(Piece(parentCapture));
+  captureThreshold = PieceValueMidgame[Piece(parentCapture)];
   phasePtr = ProbCutTable;
 
   if (   ttm != MOVE_NONE
-      && (!pos.move_is_capture(ttm) ||  pos.see(ttm) <= captureThreshold))
+      && (!pos.is_capture(ttm) ||  pos.see(ttm) <= captureThreshold))
       ttm = MOVE_NONE;
 
-  ttMove = (ttm && pos.move_is_pl(ttm) ? ttm : MOVE_NONE);
+  ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
   phasePtr += int(ttMove == MOVE_NONE) - 1;
   go_next_phase();
 }
@@ -164,14 +178,15 @@ void MovePicker::go_next_phase() {
   case PH_NONCAPTURES_1:
       lastNonCapture = lastMove = generate<MV_NON_CAPTURE>(pos, moves);
       score_noncaptures();
-      sort_moves(moves, lastNonCapture, &lastMove);
+      lastMove = std::partition(curMove, lastMove, has_positive_score);
+      sort<MoveStack>(curMove, lastMove);
       return;
 
   case PH_NONCAPTURES_2:
       curMove = lastMove;
       lastMove = lastNonCapture;
       if (depth >= 3 * ONE_PLY)
-          insertion_sort<MoveStack>(curMove, lastMove);
+          sort<MoveStack>(curMove, lastMove);
       return;
 
   case PH_BAD_CAPTURES:
@@ -236,11 +251,11 @@ void MovePicker::score_captures() {
   for (MoveStack* cur = moves; cur != lastMove; cur++)
   {
       m = cur->move;
-      cur->score =  piece_value_midgame(pos.piece_on(move_to(m)))
-                  - pos.type_of_piece_on(move_from(m));
+      cur->score =  PieceValueMidgame[pos.piece_on(move_to(m))]
+                  - type_of(pos.piece_on(move_from(m)));
 
-      if (move_is_promotion(m))
-          cur->score += QueenValueMidgame;
+      if (is_promotion(m))
+          cur->score += PieceValueMidgame[Piece(promotion_piece_type(m))];
   }
 }
 
@@ -274,9 +289,9 @@ void MovePicker::score_evasions() {
       m = cur->move;
       if ((seeScore = pos.see_sign(m)) < 0)
           cur->score = seeScore - History::MaxValue; // Be sure we are at the bottom
-      else if (pos.move_is_capture(m))
-          cur->score =  piece_value_midgame(pos.piece_on(move_to(m)))
-                      - pos.type_of_piece_on(move_from(m)) + History::MaxValue;
+      else if (pos.is_capture(m))
+          cur->score =  PieceValueMidgame[pos.piece_on(move_to(m))]
+                      - type_of(pos.piece_on(move_from(m))) + History::MaxValue;
       else
           cur->score = H.value(pos.piece_on(move_from(m)), move_to(m));
   }
@@ -306,7 +321,7 @@ Move MovePicker::get_next_move() {
           break;
 
       case PH_GOOD_CAPTURES:
-          move = pick_best(curMove++, lastMove).move;
+          move = pick_best(curMove++, lastMove)->move;
           if (move != ttMove)
           {
               assert(captureThreshold <= 0); // Otherwise we must use see instead of see_sign
@@ -316,15 +331,14 @@ Move MovePicker::get_next_move() {
               if (seeValue >= captureThreshold)
                   return move;
 
-              // Losing capture, move it to the tail of the array, note
-              // that move has now been already checked for pseudo legality.
+              // Losing capture, move it to the tail of the array
               (--badCaptures)->move = move;
               badCaptures->score = seeValue;
           }
           break;
 
      case PH_GOOD_PROBCUT:
-          move = pick_best(curMove++, lastMove).move;
+          move = pick_best(curMove++, lastMove)->move;
           if (   move != ttMove
               && pos.see(move) > captureThreshold)
               return move;
@@ -333,9 +347,9 @@ Move MovePicker::get_next_move() {
       case PH_KILLERS:
           move = (curMove++)->move;
           if (   move != MOVE_NONE
-              && pos.move_is_pl(move)
+              && pos.is_pseudo_legal(move)
               && move != ttMove
-              && !pos.move_is_capture(move))
+              && !pos.is_capture(move))
               return move;
           break;
 
@@ -349,12 +363,12 @@ Move MovePicker::get_next_move() {
           break;
 
       case PH_BAD_CAPTURES:
-          move = pick_best(curMove++, lastMove).move;
+          move = pick_best(curMove++, lastMove)->move;
           return move;
 
       case PH_EVASIONS:
       case PH_QCAPTURES:
-          move = pick_best(curMove++, lastMove).move;
+          move = pick_best(curMove++, lastMove)->move;
           if (move != ttMove)
               return move;
           break;