X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Ftt.h;h=fb414bf157aeba9fa98fbe70bbb728cd27445e1e;hb=2a461b4b745b2542f6e13bab8c60abdb366bc128;hp=0918e3e8d3938ff7a3aac7b4859c8f572c910d91;hpb=2f2e48fad23225d23f87b95fb842156cfee668fb;p=stockfish

diff --git a/src/tt.h b/src/tt.h
index 0918e3e8..fb414bf1 100644
--- a/src/tt.h
+++ b/src/tt.h
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2009 Marco Costalba
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -83,16 +83,22 @@ public:
   ~TranspositionTable();
   void set_size(unsigned mbSize);
   void clear();
-  void store(const Position& pos, Value v, ValueType type, Depth d, Move m);
-  TTEntry* retrieve(const Position& pos) const;
+  void store(const Key posKey, Value v, ValueType type, Depth d, Move m);
+  TTEntry* retrieve(const Key posKey) const;
   void new_search();
   void insert_pv(const Position& pos, Move pv[]);
   int full() const;
 
 private:
-  inline TTEntry* first_entry(const Position& pos) const;
+  inline TTEntry* first_entry(const Key posKey) const;
 
-  unsigned size, writes;
+  // Be sure 'writes' is at least one cacheline away
+  // from read only variables.
+  unsigned char pad_before[64 - sizeof(unsigned)];
+  unsigned writes; // heavy SMP read/write access here
+  unsigned char pad_after[64];
+
+  unsigned size;
   TTEntry* entries;
   uint8_t generation;
 };