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#include "printf.h"
static inline unsigned long long rdtsc()
{
long long r;
#ifdef __x86_64__
unsigned a, d;
asm volatile ("rdtsc" : "=a"(a), "=d"(d));
r = a | ((long long)d << 32);
#else
asm volatile ("rdtsc" : "=A"(r));
#endif
return r;
}
#define N (1 << 21)
int main()
{
int i;
unsigned long long t1, t2;
t1 = rdtsc();
for (i = 0; i < N; ++i)
asm volatile ("cpuid" : : : "eax", "ebx", "ecx", "edx");
t2 = rdtsc();
printf("vmexit latency: %d\n", (int)((t2 - t1) / N));
return 0;
}
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