Small cleanups

closes https://github.com/official-stockfish/Stockfish/pull/3301

No functional change

src/evaluate.cpp

@@ -37,12 +37,13 @@
 #include "incbin/incbin.h"
 
 
-// Macro to embed the default NNUE file data in the engine binary (using incbin.h, by Dale Weiler).
+// Macro to embed the default efficiently updatable neural network (NNUE) file
+// data in the engine binary (using incbin.h, by Dale Weiler).
 // This macro invocation will declare the following three variables
 //     const unsigned char        gEmbeddedNNUEData[];  // a pointer to the embedded data
 //     const unsigned char *const gEmbeddedNNUEEnd;     // a marker to the end
 //     const unsigned int         gEmbeddedNNUESize;    // the size of the embedded file
-// Note that this does not work in Microsof Visual Studio.
+// Note that this does not work in Microsoft Visual Studio.
 #if !defined(_MSC_VER) && !defined(NNUE_EMBEDDING_OFF)
   INCBIN(EmbeddedNNUE, EvalFileDefaultName);
 #else
@@ -60,9 +61,9 @@ namespace Eval {
   bool useNNUE;
   string eval_file_loaded = "None";
 
-  /// NNUE::init() tries to load a nnue network at startup time, or when the engine
+  /// NNUE::init() tries to load a NNUE network at startup time, or when the engine
   /// receives a UCI command "setoption name EvalFile value nn-[a-z0-9]{12}.nnue"
-  /// The name of the nnue network is always retrieved from the EvalFile option.
+  /// The name of the NNUE network is always retrieved from the EvalFile option.
   /// We search the given network in three locations: internally (the default
   /// network may be embedded in the binary), in the active working directory and
   /// in the engine directory. Distro packagers may define the DEFAULT_NNUE_DIRECTORY
@@ -450,7 +451,7 @@ namespace {
             // Penalty if the piece is far from the king
             score -= KingProtector[Pt == BISHOP] * distance(pos.square<KING>(Us), s);
 
-            if (Pt == BISHOP)
+            if constexpr (Pt == BISHOP)
             {
                 // Penalty according to the number of our pawns on the same color square as the
                 // bishop, bigger when the center files are blocked with pawns and smaller
@@ -482,7 +483,7 @@ namespace {
             }
         }
 
-        if (Pt == ROOK)
+        if constexpr (Pt == ROOK)
         {
             // Bonuses for rook on a (semi-)open or closed file
             if (pos.is_on_semiopen_file(Us, s))
@@ -509,7 +510,7 @@ namespace {
             }
         }
 
-        if (Pt == QUEEN)
+        if constexpr (Pt == QUEEN)
         {
             // Penalty if any relative pin or discovered attack against the queen
             Bitboard queenPinners;
@@ -517,7 +518,7 @@ namespace {
                 score -= WeakQueen;
         }
     }
-    if (T)
+    if constexpr (T)
         Trace::add(Pt, Us, score);
 
     return score;
@@ -617,7 +618,7 @@ namespace {
     // Penalty if king flank is under attack, potentially moving toward the king
     score -= FlankAttacks * kingFlankAttack;
 
-    if (T)
+    if constexpr (T)
         Trace::add(KING, Us, score);
 
     return score;
@@ -718,7 +719,7 @@ namespace {
         score += SliderOnQueen * popcount(b & safe & attackedBy2[Us]) * (1 + queenImbalance);
     }
 
-    if (T)
+    if constexpr (T)
         Trace::add(THREAT, Us, score);
 
     return score;
@@ -811,7 +812,7 @@ namespace {
         score += bonus - PassedFile * edge_distance(file_of(s));
     }
 
-    if (T)
+    if constexpr (T)
         Trace::add(PASSED, Us, score);
 
     return score;
@@ -852,7 +853,7 @@ namespace {
     int weight = pos.count<ALL_PIECES>(Us) - 3 + std::min(pe->blocked_count(), 9);
     Score score = make_score(bonus * weight * weight / 16, 0);
 
-    if (T)
+    if constexpr (T)
         Trace::add(SPACE, Us, score);
 
     return score;
@@ -947,7 +948,7 @@ namespace {
        + eg * int(PHASE_MIDGAME - me->game_phase()) * ScaleFactor(sf) / SCALE_FACTOR_NORMAL;
     v /= PHASE_MIDGAME;
 
-    if (T)
+    if constexpr (T)
     {
         Trace::add(WINNABLE, make_score(u, eg * ScaleFactor(sf) / SCALE_FACTOR_NORMAL - eg_value(score)));
         Trace::add(TOTAL, make_score(mg, eg * ScaleFactor(sf) / SCALE_FACTOR_NORMAL));
@@ -1019,7 +1020,7 @@ make_v:
     Value v = winnable(score);
 
     // In case of tracing add all remaining individual evaluation terms
-    if (T)
+    if constexpr (T)
     {
         Trace::add(MATERIAL, pos.psq_score());
         Trace::add(IMBALANCE, me->imbalance());