Skip an useless compare in space evaluation

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index df4c854030d9ba82b74dece6f469b4ba7057793b..24c741aa1cad237909e561f595335f9f9b52d015 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -366,7 +366,7 @@ void init_search() {
 
   // Init futility move count array
   for (d = 0; d < 32; d++)
-      FutilityMoveCountArray[d] = 3 + (1 << (3 * d / 8));
+      FutilityMoveCountArray[d] = int(3.001 + 0.25 * pow(d, 2.0));
 }
 
 
@@ -1434,12 +1434,11 @@ namespace {
             assert(tte->static_value() != VALUE_NONE);
 
             evalMargin = tte->static_value_margin();
-            bestValue = tte->static_value();
+            ss->eval = bestValue = tte->static_value();
         }
         else
-            bestValue = evaluate(pos, evalMargin);
+            ss->eval = bestValue = evaluate(pos, evalMargin);
 
-        ss->eval = bestValue;
         update_gains(pos, (ss-1)->currentMove, (ss-1)->eval, ss->eval);
 
         // Stand pat. Return immediately if static value is at least beta
@@ -1458,7 +1457,7 @@ namespace {
         deepChecks = (depth == -ONE_PLY && bestValue >= beta - PawnValueMidgame / 8);
 
         // Futility pruning parameters, not needed when in check
-        futilityBase = bestValue + FutilityMarginQS + evalMargin;
+        futilityBase = ss->eval + evalMargin + FutilityMarginQS;
         enoughMaterial = pos.non_pawn_material(pos.side_to_move()) > RookValueMidgame;
     }
 
@@ -1498,7 +1497,7 @@ namespace {
           }
       }
 
-      // Detect blocking evasions that are candidate to be pruned
+      // Detect non-capture evasions that are candidate to be pruned
       evasionPrunable =   isCheck
                        && bestValue > value_mated_in(PLY_MAX)
                        && !pos.move_is_capture(move)