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__rdtsc

Microsoft Specific

Generates the rdtsc instruction, which returns the processor time stamp. The processor time stamp records the number of clock cycles since the last reset.


unsigned __int64 __rdtsc(void);

A 64-bit unsigned integer representing a tick count.

Intrinsic Architecture

__rdtsc

x86, x64

Header file <intrin.h>

This routine is only available as an intrinsic.

// rdtsc.cpp
// processor: x86, x64
#include <stdio.h>
#include <intrin.h>

#pragma intrinsic(__rdtsc)

int main()
{
    unsigned __int64 i;
    i = __rdtsc();
    printf_s("%I64d ticks\n", i);
}

Sample Output

3363423610155519 ticks

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