获取cputick的函数

int getcputick(unsigned int* low,unsigned int* high)

{

   unsigned int lowtmp = 0,hightmp = 0;

   assert(low != NULL);

   assert(high != NULL);

   __asm__ __volatile__("rdtsc" : "=a" (lowtmp),"=d"(hightmp));

   *low = lowtmp;

   *high = hightmp;

}