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count cycles on msvc

--- a/bench/bench.c

+++ b/bench/bench.c

@@ -43,6 +43,11 @@

   __asm__ __volatile__( ".byte 15;.byte 49;" : "=A" ( result ) );

   return result;

 }

+#elif defined(_MSC_VER)

+#include <intrin.h>

+static unsigned long long cpucycles( void ) {

+  return __rdtsc();

+}

 #else

 #error "Don't know how to count cycles on this platform!"

 #endif

-- 

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