windows 下 纳秒级计算 内嵌汇编

#include
#include


int main()
{
volatile unsigned int ts,te;
volatile unsigned int sdx,edx;



unsigned __int64  clock_cycles;
 unsigned int max=1<<31;
  unsigned __int64  max0=(unsigned __int64 )max*2;
clock_t start,end;
start=clock();

__asm
{
   rdtsc;
   mov sdx,edx;
   mov ts,eax;
}
Sleep(1000);
end=clock();
__asm
{
   rdtsc;
   mov edx,edx;
   mov te,eax;
}
   clock_cycles=(unsigned __int64 )(edx-sdx)*max0+te-ts;
   printf("ticks=%lu\n",clock_cycles);

 return 0;

}