Remove all references to Score type

Score is obsolete with the removal of psqt.

No functional change.

Signed-off-by: Cody Ho <codyho@stanford.edu>

closes https://github.com/official-stockfish/Stockfish/pull/4724

src/tune.cpp

@@ -92,19 +92,6 @@ template<> void Tune::Entry<Value>::read_option() {
       value = Value(int(Options[name]));
 }
 
-template<> void Tune::Entry<Score>::init_option() {
-  make_option("m" + name, mg_value(value), range);
-  make_option("e" + name, eg_value(value), range);
-}
-
-template<> void Tune::Entry<Score>::read_option() {
-  if (Options.count("m" + name))
-      value = make_score(int(Options["m" + name]), eg_value(value));
-
-  if (Options.count("e" + name))
-      value = make_score(mg_value(value), int(Options["e" + name]));
-}
-
 // Instead of a variable here we have a PostUpdate function: just call it
 template<> void Tune::Entry<Tune::PostUpdate>::init_option() {}
 template<> void Tune::Entry<Tune::PostUpdate>::read_option() { value(); }

src/tune.h

@@ -51,18 +51,17 @@ struct SetRange {
 /// qualifiers from the variables you want to tune and flag them for tuning, so
 /// if you have:
 ///
-///   const Score myScore = S(10, 15);
 ///   const Value myValue[][2] = { { V(100), V(20) }, { V(7), V(78) } };
 ///
 /// If you have a my_post_update() function to run after values have been updated,
 /// and a my_range() function to set custom Option's min-max values, then you just
 /// remove the 'const' qualifiers and write somewhere below in the file:
 ///
-///   TUNE(SetRange(my_range), myScore, myValue, my_post_update);
+///   TUNE(SetRange(my_range), myValue, my_post_update);
 ///
 /// You can also set the range directly, and restore the default at the end
 ///
-///   TUNE(SetRange(-100, 100), myScore, SetDefaultRange);
+///   TUNE(SetRange(-100, 100), myValue, SetDefaultRange);
 ///
 /// In case update function is slow and you have many parameters, you can add:
 ///
@@ -98,7 +97,6 @@ class Tune {
 
     static_assert(   std::is_same<T,   int>::value
                   || std::is_same<T, Value>::value
-                  || std::is_same<T, Score>::value
                   || std::is_same<T, PostUpdate>::value, "Parameter type not supported!");
 
     Entry(const std::string& n, T& v, const SetRange& r) : name(n), value(v), range(r) {}

src/types.h

@@ -154,8 +154,6 @@ enum CastlingRights {
 };
 
 enum Phase {
-  PHASE_ENDGAME,
-  PHASE_MIDGAME = 128,
   MG = 0, EG = 1, PHASE_NB = 2
 };
 
@@ -194,8 +192,6 @@ enum Value : int {
   BishopValueMg = 825,   BishopValueEg = 915,
   RookValueMg   = 1276,  RookValueEg   = 1380,
   QueenValueMg  = 2538,  QueenValueEg  = 2682,
-
-  MidgameLimit  = 15258, EndgameLimit  = 3915
 };
 
 enum PieceType {
@@ -281,29 +277,6 @@ struct DirtyPiece {
   Square to[3];
 };
 
-/// Score enum stores a middlegame and an endgame value in a single integer (enum).
-/// The least significant 16 bits are used to store the middlegame value and the
-/// upper 16 bits are used to store the endgame value. We have to take care to
-/// avoid left-shifting a signed int to avoid undefined behavior.
-enum Score : int { SCORE_ZERO };
-
-constexpr Score make_score(int mg, int eg) {
-  return Score((int)((unsigned int)eg << 16) + mg);
-}
-
-/// Extracting the signed lower and upper 16 bits is not so trivial because
-/// according to the standard a simple cast to short is implementation defined
-/// and so is a right shift of a signed integer.
-inline Value eg_value(Score s) {
-  union { uint16_t u; int16_t s; } eg = { uint16_t(unsigned(s + 0x8000) >> 16) };
-  return Value(eg.s);
-}
-
-inline Value mg_value(Score s) {
-  union { uint16_t u; int16_t s; } mg = { uint16_t(unsigned(s)) };
-  return Value(mg.s);
-}
-
 #define ENABLE_BASE_OPERATORS_ON(T)                                \
 constexpr T operator+(T d1, int d2) { return T(int(d1) + d2); }    \
 constexpr T operator-(T d1, int d2) { return T(int(d1) - d2); }    \
@@ -333,8 +306,6 @@ ENABLE_INCR_OPERATORS_ON(Square)
 ENABLE_INCR_OPERATORS_ON(File)
 ENABLE_INCR_OPERATORS_ON(Rank)
 
-ENABLE_BASE_OPERATORS_ON(Score)
-
 #undef ENABLE_FULL_OPERATORS_ON
 #undef ENABLE_INCR_OPERATORS_ON
 #undef ENABLE_BASE_OPERATORS_ON
@@ -345,32 +316,6 @@ constexpr Square operator-(Square s, Direction d) { return Square(int(s) - int(d
 inline Square& operator+=(Square& s, Direction d) { return s = s + d; }
 inline Square& operator-=(Square& s, Direction d) { return s = s - d; }
 
-/// Only declared but not defined. We don't want to multiply two scores due to
-/// a very high risk of overflow. So user should explicitly convert to integer.
-Score operator*(Score, Score) = delete;
-
-/// Division of a Score must be handled separately for each term
-inline Score operator/(Score s, int i) {
-  return make_score(mg_value(s) / i, eg_value(s) / i);
-}
-
-/// Multiplication of a Score by an integer. We check for overflow in debug mode.
-inline Score operator*(Score s, int i) {
-
-  Score result = Score(int(s) * i);
-
-  assert(eg_value(result) == (i * eg_value(s)));
-  assert(mg_value(result) == (i * mg_value(s)));
-  assert((i == 0) || (result / i) == s);
-
-  return result;
-}
-
-/// Multiplication of a Score by a boolean
-inline Score operator*(Score s, bool b) {
-  return b ? s : SCORE_ZERO;
-}
-
 constexpr Color operator~(Color c) {
   return Color(c ^ BLACK); // Toggle color
 }