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();  

Return Value

A 64-bit unsigned integer representing a tick count.


Intrinsic Architecture
__rdtsc x86, --- --- x64

Header file <intrin.h>


This routine is available only as an intrinsic.

The interpretation of the TSC value in this generation of hardware differs from that in earlier versions of --- --- x64. See hardware manuals for more information.


// 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);  
3363423610155519 ticks  

END Microsoft Specific

See Also

Compiler Intrinsics