C語言計算代碼執行所耗CPU時鍾周期

#include "windows.h"

LARGE_INTEGER _start = { 0 }, _end = { 0 };
__asm{
  rdtsc
  mov dword ptr [_start.LowPart], eax
  mov dword ptr[_start.HighPart], edx
}
 
//your code here
 
__asm{
  rdtsc
  mov dword ptr [_end.LowPart], eax
  mov dword ptr[_end.HighPart], edx
}
 
long interval = static_cast<long>(_end.QuadPart - _start.QuadPart);