Retire apply_scale_factor() and scale.h

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 0082fc09547891205b0269a888c8c0d4a6fdb037..73ffcfb053057a6a203674dff264702940f55110 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -29,7 +29,6 @@
 #include "evaluate.h"
 #include "material.h"
 #include "pawns.h"
-#include "scale.h"
 #include "thread.h"
 #include "ucioption.h"
 
@@ -207,7 +206,6 @@ namespace {
 
   // Bonuses for enemy's safe checks
   const int QueenContactCheckBonus = 3;
-  const int DiscoveredCheckBonus   = 3;
   const int QueenCheckBonus        = 2;
   const int RookCheckBonus         = 1;
   const int BishopCheckBonus       = 1;
@@ -255,7 +253,7 @@ namespace {
   void evaluate_threats(const Position& pos, EvalInfo& ei);
 
   template<Color Us, bool HasPopCnt>
-  void evaluate_space(const Position& pos, EvalInfo& ei);
+  int evaluate_space(const Position& pos, EvalInfo& ei);
 
   template<Color Us>
   void evaluate_passed_pawns(const Position& pos, EvalInfo& ei);
@@ -362,8 +360,8 @@ Value do_evaluate(const Position& pos, EvalInfo& ei) {
       // Evaluate space for both sides
       if (ei.mi->space_weight() > 0)
       {
-          evaluate_space<WHITE, HasPopCnt>(pos, ei);
-          evaluate_space<BLACK, HasPopCnt>(pos, ei);
+          int s = evaluate_space<WHITE, HasPopCnt>(pos, ei) - evaluate_space<BLACK, HasPopCnt>(pos, ei);
+          ei.value += apply_weight(make_score(s * ei.mi->space_weight(), 0), Weights[Space]);
       }
   }
 
@@ -470,7 +468,7 @@ void read_weights(Color us) {
 
 namespace {
 
-  // init_king_tables() initializes king bitboards for both sides adding
+  // init_attack_tables() initializes king bitboards for both sides adding
   // pawn attacks. To be done before other evaluations.
 
   template<Color Us, bool HasPopCnt>
@@ -862,8 +860,7 @@ namespace {
         // value if the other side has a rook or queen.
         if (square_file(s) == FILE_A || square_file(s) == FILE_H)
         {
-            if (   pos.non_pawn_material(Them) <= KnightValueMidgame
-                && pos.piece_count(Them, KNIGHT) <= 1)
+            if (pos.non_pawn_material(Them) <= KnightValueMidgame)
                 ebonus += ebonus / 4;
             else if (pos.pieces(ROOK, QUEEN, Them))
                 ebonus -= ebonus / 4;
@@ -896,7 +893,7 @@ namespace {
             Square s = pop_1st_bit(&b);
             Square queeningSquare = relative_square(c, make_square(square_file(s), RANK_8));
             int d =  square_distance(s, queeningSquare)
-                   - (relative_rank(c, s) == RANK_2) // Double pawn push
+                   - int(relative_rank(c, s) == RANK_2) // Double pawn push
                    - square_distance(pos.king_square(opposite_color(c)), queeningSquare)
                    + int(c != pos.side_to_move());
 
@@ -1039,27 +1036,24 @@ namespace {
   // twice. Finally, the space bonus is scaled by a weight taken from the
   // material hash table.
   template<Color Us, bool HasPopCnt>
-  void evaluate_space(const Position& pos, EvalInfo& ei) {
+  int evaluate_space(const Position& pos, EvalInfo& ei) {
 
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 
     // Find the safe squares for our pieces inside the area defined by
     // SpaceMask[us]. A square is unsafe if it is attacked by an enemy
     // pawn, or if it is undefended and attacked by an enemy piece.
-    Bitboard safeSquares =   SpaceMask[Us]
-                          & ~pos.pieces(PAWN, Us)
-                          & ~ei.attacked_by(Them, PAWN)
-                          & (ei.attacked_by(Us) | ~ei.attacked_by(Them));
+    Bitboard safe =   SpaceMask[Us]
+                   & ~pos.pieces(PAWN, Us)
+                   & ~ei.attacked_by(Them, PAWN)
+                   & (ei.attacked_by(Us) | ~ei.attacked_by(Them));
 
     // Find all squares which are at most three squares behind some friendly pawn
-    Bitboard behindFriendlyPawns = pos.pieces(PAWN, Us);
-    behindFriendlyPawns |= (Us == WHITE ? behindFriendlyPawns >>  8 : behindFriendlyPawns <<  8);
-    behindFriendlyPawns |= (Us == WHITE ? behindFriendlyPawns >> 16 : behindFriendlyPawns << 16);
+    Bitboard behind = pos.pieces(PAWN, Us);
+    behind |= (Us == WHITE ? behind >>  8 : behind <<  8);
+    behind |= (Us == WHITE ? behind >> 16 : behind << 16);
 
-    int space =  count_1s_max_15<HasPopCnt>(safeSquares)
-               + count_1s_max_15<HasPopCnt>(behindFriendlyPawns & safeSquares);
-
-    ei.value += Sign[Us] * apply_weight(make_score(space * ei.mi->space_weight(), 0), Weights[Space]);
+    return count_1s_max_15<HasPopCnt>(safe) + count_1s_max_15<HasPopCnt>(behind & safe);
   }
 
 
@@ -1080,7 +1074,9 @@ namespace {
     assert(eg_value(v) > -VALUE_INFINITE && eg_value(v) < VALUE_INFINITE);
     assert(ph >= PHASE_ENDGAME && ph <= PHASE_MIDGAME);
 
-    Value ev = apply_scale_factor(eg_value(v), sf[(eg_value(v) > Value(0) ? WHITE : BLACK)]);
+    Value eg = eg_value(v);
+    ScaleFactor f = sf[eg > Value(0) ? WHITE : BLACK];
+    Value ev = Value((eg * f) / int(SCALE_FACTOR_NORMAL));
 
     int result = (mg_value(v) * ph + ev * (128 - ph)) / 128;
     return Value(result & ~(GrainSize - 1));