X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Ftt.h;h=fb414bf157aeba9fa98fbe70bbb728cd27445e1e;hp=c570761bdec0fd91120fe99a28b1b18f562c7bcc;hb=630fda2e2cfd44ccf33c2c66ec30842fbca9a4f3;hpb=8bec65029d6ac3b22b956cfd820ec754420052df

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;
 };