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sighingnow/rdstc-demo.c

Created October 1, 2016 04:52
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Demo of Read Time-Stamp Counter (rdstc instruction).
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rdstc-demo.c
/**
* author: Tao He, sighingnow@gmail.com
*/
uint64_t rdtsc() {
uint32_t lo, hi;
__asm__ __volatile__("rdtsc" : "=a"(lo), "=d"(hi));
return (uint64_t)hi << 32 | lo;
}
int main(int, char **) {
printf("%llu\n", rdtsc());
return 0;
}
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