Reorder data layout and optimize access patern

With this very simple patch we get a speed boost
of 0.8% on my PC !

Sometime we find the most complex tricks to increase speed
when instead the best results come from the simplest solutions.

No functional change of course ;-)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

diff --git a/src/position.h b/src/position.h
index a051ec382f49fe15a0d3ee55238e97a48c1158ac..4f6f2d5383b72c861e56db32e27a22110e37014e 100644 (file)
--- a/src/position.h
+++ b/src/position.h
@@ -298,12 +298,12 @@ private:
   template<GamePhase> Value compute_value() const;
   Value compute_non_pawn_material(Color c) const;
 
   template<GamePhase> Value compute_value() const;
   Value compute_non_pawn_material(Color c) const;
 

-  // Bitboards
-  Bitboard byColorBB[2], byTypeBB[8];
-

   // Board
   Piece board[64];
 
   // Board
   Piece board[64];
 

+  // Bitboards
+  Bitboard byTypeBB[8], byColorBB[2];
+

   // Piece counts
   int pieceCount[2][8]; // [color][pieceType]
 
   // Piece counts
   int pieceCount[2][8]; // [color][pieceType]