X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Ftt.h;h=fb414bf157aeba9fa98fbe70bbb728cd27445e1e;hb=2a461b4b745b2542f6e13bab8c60abdb366bc128;hp=c570761bdec0fd91120fe99a28b1b18f562c7bcc;hpb=5c81602d14539f8259a715477315e28b5de7cb54;p=stockfish

diff --git a/src/tt.h b/src/tt.h
index c570761b..fb414bf1 100644
--- a/src/tt.h
+++ b/src/tt.h
@@ -92,7 +92,13 @@ public:
 private:
   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;
 };