Temporary revert "Expose EvalInfo struct to search"

It is not needed for the release and introduces
a slowdown, although very small.

Probably it will be readded after the release.

No functional change.

src/evaluate.cpp

@@ -24,13 +24,53 @@
 
 #include "bitcount.h"
 #include "evaluate.h"
+#include "material.h"
+#include "pawns.h"
 #include "thread.h"
 #include "ucioption.h"
 
-using namespace Eval;
-
 namespace {
 
+  // Struct EvalInfo contains various information computed and collected
+  // by the evaluation functions.
+  struct EvalInfo {
+
+    // Pointers to material and pawn hash table entries
+    Material::Entry* mi;
+    Pawns::Entry* pi;
+
+    // attackedBy[color][piece type] is a bitboard representing all squares
+    // attacked by a given color and piece type, attackedBy[color][ALL_PIECES]
+    // contains all squares attacked by the given color.
+    Bitboard attackedBy[COLOR_NB][PIECE_TYPE_NB];
+
+    // kingRing[color] is the zone around the king which is considered
+    // by the king safety evaluation. This consists of the squares directly
+    // adjacent to the king, and the three (or two, for a king on an edge file)
+    // squares two ranks in front of the king. For instance, if black's king
+    // is on g8, kingRing[BLACK] is a bitboard containing the squares f8, h8,
+    // f7, g7, h7, f6, g6 and h6.
+    Bitboard kingRing[COLOR_NB];
+
+    // kingAttackersCount[color] is the number of pieces of the given color
+    // which attack a square in the kingRing of the enemy king.
+    int kingAttackersCount[COLOR_NB];
+
+    // kingAttackersWeight[color] is the sum of the "weight" of the pieces of the
+    // given color which attack a square in the kingRing of the enemy king. The
+    // weights of the individual piece types are given by the variables
+    // QueenAttackWeight, RookAttackWeight, BishopAttackWeight and
+    // KnightAttackWeight in evaluate.cpp
+    int kingAttackersWeight[COLOR_NB];
+
+    // kingAdjacentZoneAttacksCount[color] is the number of attacks to squares
+    // directly adjacent to the king of the given color. Pieces which attack
+    // more than one square are counted multiple times. For instance, if black's
+    // king is on g8 and there's a white knight on g5, this knight adds
+    // 2 to kingAdjacentZoneAttacksCount[BLACK].
+    int kingAdjacentZoneAttacksCount[COLOR_NB];
+  };
+
   // Evaluation grain size, must be a power of 2
   const int GrainSize = 8;
 
@@ -200,27 +240,27 @@ namespace {
 
   // Function prototypes
   template<bool Trace>
-  Value do_evaluate(const Position& pos, Value& margin, Info& ei);
+  Value do_evaluate(const Position& pos, Value& margin);
 
   template<Color Us>
-  void init_eval_info(const Position& pos, Info& ei);
+  void init_eval_info(const Position& pos, EvalInfo& ei);
 
   template<Color Us, bool Trace>
-  Score evaluate_pieces_of_color(const Position& pos, Info& ei, Score& mobility);
+  Score evaluate_pieces_of_color(const Position& pos, EvalInfo& ei, Score& mobility);
 
   template<Color Us, bool Trace>
-  Score evaluate_king(const Position& pos, Info& ei, Value margins[]);
+  Score evaluate_king(const Position& pos, EvalInfo& ei, Value margins[]);
 
   template<Color Us>
-  Score evaluate_threats(const Position& pos, Info& ei);
+  Score evaluate_threats(const Position& pos, EvalInfo& ei);
 
   template<Color Us>
-  int evaluate_space(const Position& pos, Info& ei);
+  int evaluate_space(const Position& pos, EvalInfo& ei);
 
   template<Color Us>
-  Score evaluate_passed_pawns(const Position& pos, Info& ei);
+  Score evaluate_passed_pawns(const Position& pos, EvalInfo& ei);
 
-  Score evaluate_unstoppable_pawns(const Position& pos, Info& ei);
+  Score evaluate_unstoppable_pawns(const Position& pos, EvalInfo& ei);
 
   Value interpolate(const Score& v, Phase ph, ScaleFactor sf);
   Score weight_option(const std::string& mgOpt, const std::string& egOpt, Score internalWeight);
@@ -236,8 +276,8 @@ namespace Eval {
   /// values, an endgame score and a middle game score, and interpolates
   /// between them based on the remaining material.
 
-  Value evaluate(const Position& pos, Value& margin, Info* ei) {
+  Value evaluate(const Position& pos, Value& margin) {
-    return do_evaluate<false>(pos, margin, *ei);
+    return do_evaluate<false>(pos, margin);
   }
 
 
@@ -273,7 +313,6 @@ namespace Eval {
 
     Value margin;
     std::string totals;
-    Info ei;
 
     Search::RootColor = pos.side_to_move();
 
@@ -281,7 +320,7 @@ namespace Eval {
     TraceStream << std::showpoint << std::showpos << std::fixed << std::setprecision(2);
     memset(TracedScores, 0, 2 * 16 * sizeof(Score));
 
-    do_evaluate<true>(pos, margin, ei);
+    do_evaluate<true>(pos, margin);
 
     totals = TraceStream.str();
     TraceStream.str("");
@@ -317,10 +356,11 @@ namespace Eval {
 namespace {
 
 template<bool Trace>
-Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
+Value do_evaluate(const Position& pos, Value& margin) {
 
   assert(!pos.checkers());
 
+  EvalInfo ei;
   Value margins[COLOR_NB];
   Score score, mobilityWhite, mobilityBlack;
   Thread* th = pos.this_thread();
@@ -443,7 +483,7 @@ Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
   // pawn attacks. To be done at the beginning of the evaluation.
 
   template<Color Us>
-  void init_eval_info(const Position& pos, Info& ei) {
+  void init_eval_info(const Position& pos, EvalInfo& ei) {
 
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 
@@ -466,7 +506,7 @@ Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
   // evaluate_outposts() evaluates bishop and knight outposts squares
 
   template<PieceType Piece, Color Us>
-  Score evaluate_outposts(const Position& pos, Info& ei, Square s) {
+  Score evaluate_outposts(const Position& pos, EvalInfo& ei, Square s) {
 
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 
@@ -492,7 +532,7 @@ Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
   // evaluate_pieces<>() assigns bonuses and penalties to the pieces of a given color
 
   template<PieceType Piece, Color Us, bool Trace>
-  Score evaluate_pieces(const Position& pos, Info& ei, Score& mobility, Bitboard mobilityArea) {
+  Score evaluate_pieces(const Position& pos, EvalInfo& ei, Score& mobility, Bitboard mobilityArea) {
 
     Bitboard b;
     Square s, ksq;
@@ -641,7 +681,7 @@ Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
   // and the type of attacked one.
 
   template<Color Us>
-  Score evaluate_threats(const Position& pos, Info& ei) {
+  Score evaluate_threats(const Position& pos, EvalInfo& ei) {
 
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 
@@ -683,7 +723,7 @@ Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
   // pieces of a given color.
 
   template<Color Us, bool Trace>
-  Score evaluate_pieces_of_color(const Position& pos, Info& ei, Score& mobility) {
+  Score evaluate_pieces_of_color(const Position& pos, EvalInfo& ei, Score& mobility) {
 
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 
@@ -708,7 +748,7 @@ Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
   // evaluate_king<>() assigns bonuses and penalties to a king of a given color
 
   template<Color Us, bool Trace>
-  Score evaluate_king(const Position& pos, Info& ei, Value margins[]) {
+  Score evaluate_king(const Position& pos, EvalInfo& ei, Value margins[]) {
 
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 
@@ -821,7 +861,7 @@ Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
   // evaluate_passed_pawns<>() evaluates the passed pawns of the given color
 
   template<Color Us>
-  Score evaluate_passed_pawns(const Position& pos, Info& ei) {
+  Score evaluate_passed_pawns(const Position& pos, EvalInfo& ei) {
 
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 
@@ -919,7 +959,7 @@ Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
   // evaluate_unstoppable_pawns() evaluates the unstoppable passed pawns for both sides, this is quite
   // conservative and returns a winning score only when we are very sure that the pawn is winning.
 
-  Score evaluate_unstoppable_pawns(const Position& pos, Info& ei) {
+  Score evaluate_unstoppable_pawns(const Position& pos, EvalInfo& ei) {
 
     Bitboard b, b2, blockers, supporters, queeningPath, candidates;
     Square s, blockSq, queeningSquare;
@@ -1084,7 +1124,7 @@ Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
   // twice. Finally, the space bonus is scaled by a weight taken from the
   // material hash table. The aim is to improve play on game opening.
   template<Color Us>
-  int evaluate_space(const Position& pos, Info& ei) {
+  int evaluate_space(const Position& pos, EvalInfo& ei) {
 
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 

src/evaluate.h

@@ -20,56 +20,14 @@
 #if !defined(EVALUATE_H_INCLUDED)
 #define EVALUATE_H_INCLUDED
 
-#include "material.h"
-#include "pawns.h"
 #include "types.h"
 
 class Position;
 
 namespace Eval {
 
-// Struct Eval::Info contains various information computed and collected
-// by the evaluation functions.
-struct Info {
-
-  // Pointers to material and pawn hash table entries
-  Material::Entry* mi;
-  Pawns::Entry* pi;
-
-  // attackedBy[color][piece type] is a bitboard representing all squares
-  // attacked by a given color and piece type, attackedBy[color][ALL_PIECES]
-  // contains all squares attacked by the given color.
-  Bitboard attackedBy[COLOR_NB][PIECE_TYPE_NB];
-
-  // kingRing[color] is the zone around the king which is considered
-  // by the king safety evaluation. This consists of the squares directly
-  // adjacent to the king, and the three (or two, for a king on an edge file)
-  // squares two ranks in front of the king. For instance, if black's king
-  // is on g8, kingRing[BLACK] is a bitboard containing the squares f8, h8,
-  // f7, g7, h7, f6, g6 and h6.
-  Bitboard kingRing[COLOR_NB];
-
-  // kingAttackersCount[color] is the number of pieces of the given color
-  // which attack a square in the kingRing of the enemy king.
-  int kingAttackersCount[COLOR_NB];
-
-  // kingAttackersWeight[color] is the sum of the "weight" of the pieces of the
-  // given color which attack a square in the kingRing of the enemy king. The
-  // weights of the individual piece types are given by the variables
-  // QueenAttackWeight, RookAttackWeight, BishopAttackWeight and
-  // KnightAttackWeight in evaluate.cpp
-  int kingAttackersWeight[COLOR_NB];
-
-  // kingAdjacentZoneAttacksCount[color] is the number of attacks to squares
-  // directly adjacent to the king of the given color. Pieces which attack
-  // more than one square are counted multiple times. For instance, if black's
-  // king is on g8 and there's a white knight on g5, this knight adds
-  // 2 to kingAdjacentZoneAttacksCount[BLACK].
-  int kingAdjacentZoneAttacksCount[COLOR_NB];
-};
-
 extern void init();
-extern Value evaluate(const Position& pos, Value& margin, Info* ei);
+extern Value evaluate(const Position& pos, Value& margin);
 extern std::string trace(const Position& pos);
 
 }

src/search.cpp

@@ -593,7 +593,7 @@ namespace {
         // Never assume anything on values stored in TT
         if (  (ss->staticEval = eval = tte->eval_value()) == VALUE_NONE
             ||(ss->evalMargin = tte->eval_margin()) == VALUE_NONE)
-            eval = ss->staticEval = evaluate(pos, ss->evalMargin, &ss->ei);
+            eval = ss->staticEval = evaluate(pos, ss->evalMargin);
 
         // Can ttValue be used as a better position evaluation?
         if (ttValue != VALUE_NONE)
@@ -603,7 +603,7 @@ namespace {
     }
     else
     {
-        eval = ss->staticEval = evaluate(pos, ss->evalMargin, &ss->ei);
+        eval = ss->staticEval = evaluate(pos, ss->evalMargin);
         TT.store(posKey, VALUE_NONE, BOUND_NONE, DEPTH_NONE, MOVE_NONE,
                  ss->staticEval, ss->evalMargin);
     }
@@ -1178,10 +1178,10 @@ split_point_start: // At split points actual search starts from here
             // Never assume anything on values stored in TT
             if (  (ss->staticEval = bestValue = tte->eval_value()) == VALUE_NONE
                 ||(ss->evalMargin = tte->eval_margin()) == VALUE_NONE)
-                ss->staticEval = bestValue = evaluate(pos, ss->evalMargin, &ss->ei);
+                ss->staticEval = bestValue = evaluate(pos, ss->evalMargin);
         }
         else
-            ss->staticEval = bestValue = evaluate(pos, ss->evalMargin, &ss->ei);
+            ss->staticEval = bestValue = evaluate(pos, ss->evalMargin);
 
         // Stand pat. Return immediately if static value is at least beta
         if (bestValue >= beta)

src/search.h

@@ -25,7 +25,6 @@
 #include <stack>
 #include <vector>
 
-#include "evaluate.h"
 #include "misc.h"
 #include "position.h"
 #include "types.h"
@@ -49,7 +48,6 @@ struct Stack {
   Value evalMargin;
   int skipNullMove;
   int futilityMoveCount;
-  Eval::Info ei;
 };