X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmisc.cpp;h=7ed4b443370ac5bf359deb13799fe679bbb22309;hp=0d27b615ea75122695f37e8c9da0ab3021525cb4;hb=a010d438a2e378a82943835d49a53dfaa15c95d1;hpb=86c2d2fc3b596e544e7f280edf2bd7b3f755b83d

diff --git a/src/misc.cpp b/src/misc.cpp
index 0d27b615..7ed4b443 100644
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -39,6 +39,10 @@
 
 #endif
 
+#if !defined(NO_PREFETCH)
+#  include <xmmintrin.h>
+#endif
+
 #include <cassert>
 #include <cstdio>
 #include <iomanip>
@@ -54,7 +58,7 @@ using namespace std;
 /// Version number. If this is left empty, the current date (in the format
 /// YYMMDD) is used as a version number.
 
-static const string EngineVersion = "1.7.1";
+static const string EngineVersion = "";
 static const string AppName = "Stockfish";
 static const string AppTag  = "";
 
@@ -287,4 +291,27 @@ int Bioskey()
         return 0;
     }
 }
+
 #endif
+
+/// prefetch() preloads the given address in L1/L2 cache. This is a non
+/// blocking function and do not stalls the CPU waiting for data to be
+/// loaded from RAM, that can be very slow.
+#if defined(NO_PREFETCH)
+void prefetch(char*) {}
+#else
+
+void prefetch(char* addr) {
+
+#if defined(__INTEL_COMPILER) || defined(__ICL)
+   // This hack prevents prefetches to be optimized away by
+   // Intel compiler. Both MSVC and gcc seems not affected.
+   __asm__ ("");
+#endif
+
+  _mm_prefetch(addr, _MM_HINT_T2);
+  _mm_prefetch(addr+64, _MM_HINT_T2); // 64 bytes ahead
+}
+
+#endif
+