Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All
Expand Minimize
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

__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

Community Additions

ADD
Show:
© 2015 Microsoft