History code rewrite (#1122)

[stockfish] / src / movepick.cpp

diff --git a/src/movepick.cpp b/src/movepick.cpp
index 992657e7654b7c3e1dc1a30c8ba36d718569c152..55c685476dcdd481c898b32104a76e0f8c29044b 100644 (file)
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -36,18 +36,16 @@ namespace {
 
   // partial_insertion_sort() sorts moves in descending order up to and including
   // a given limit. The order of moves smaller than the limit is left unspecified.
-  // To keep the implementation simple, *begin is always included in the sorted moves.
   void partial_insertion_sort(ExtMove* begin, ExtMove* end, int limit) {
 
-    for (ExtMove *sortedEnd = begin + 1, *p = begin + 1; p < end; ++p)
+    for (ExtMove *sortedEnd = begin, *p = begin + 1; p < end; ++p)
         if (p->value >= limit)
         {
             ExtMove tmp = *p, *q;
-            *p = *sortedEnd;
-            for (q = sortedEnd; q != begin && *(q-1) < tmp; --q)
-                *q = *(q-1);
+            *p = *++sortedEnd;
+            for (q = sortedEnd; q != begin && *(q - 1) < tmp; --q)
+                *q = *(q - 1);
             *q = tmp;
-            ++sortedEnd;
         }
   }
 
@@ -145,11 +143,11 @@ void MovePicker::score<CAPTURES>() {
 template<>
 void MovePicker::score<QUIETS>() {
 
-  const HistoryStats& history = pos.this_thread()->history;
+  const ButterflyHistory& history = pos.this_thread()->history;
 
-  const CounterMoveStats& cmh = *(ss-1)->counterMoves;
-  const CounterMoveStats& fmh = *(ss-2)->counterMoves;
-  const CounterMoveStats& fm2 = *(ss-4)->counterMoves;
+  const PieceToHistory& cmh = *(ss-1)->history;
+  const PieceToHistory& fmh = *(ss-2)->history;
+  const PieceToHistory& fm2 = *(ss-4)->history;
 
   Color c = pos.side_to_move();
 
@@ -157,21 +155,21 @@ void MovePicker::score<QUIETS>() {
       m.value =  cmh[pos.moved_piece(m)][to_sq(m)]
                + fmh[pos.moved_piece(m)][to_sq(m)]
                + fm2[pos.moved_piece(m)][to_sq(m)]
-               + history.get(c, m);
+               + history[c][from_to(m)];
 }
 
 template<>
 void MovePicker::score<EVASIONS>() {
   // Try captures ordered by MVV/LVA, then non-captures ordered by stats heuristics
-  const HistoryStats& history = pos.this_thread()->history;
+  const ButterflyHistory& history = pos.this_thread()->history;
   Color c = pos.side_to_move();
 
   for (auto& m : *this)
       if (pos.capture(m))
           m.value =  PieceValue[MG][pos.piece_on(to_sq(m))]
-                   - Value(type_of(pos.moved_piece(m))) + HistoryStats::Max;
+                   - Value(type_of(pos.moved_piece(m))) + (1 << 28);
       else
-          m.value = history.get(c, m);
+          m.value = history[c][from_to(m)];
 }
 
 
@@ -204,7 +202,7 @@ Move MovePicker::next_move(bool skipQuiets) {
           move = pick_best(cur++, endMoves);
           if (move != ttMove)
           {
-              if (pos.see_ge(move, VALUE_ZERO))
+              if (pos.see_ge(move))
                   return move;
 
               // Losing capture, move it to the beginning of the array