C++利用QueryPerformanceCounter计算代码运行时间

// 在Xtimer.h中定义。
#pragma once

#define _X_TIMER_CREATE(Alias) \

LARGE_INTEGER _d_timer_##Alias##_start_at = {0}; \

LARGE_INTEGER _d_timer_##Alias##_stop_at = {0}; \

LARGE_INTEGER _d_timer_##Alias##_time = {0}; \

UINT _d_timer_##Alias##_run_times = 0;

#define _X_TIMER_RESET(Alias) \

_d_timer_##Alias##_time.QuadPart = 0; \

_d_timer_##Alias##_run_times = 0;

#define _X_TIMER_START(Alias) \

QueryPerformanceCounter(&_d_timer_##Alias##_start_at); \

_d_timer_##Alias##_run_times++;

#define _X_TIMER_PAUSE(Alias) \

QueryPerformanceCounter(&_d_timer_##Alias##_stop_at); \

_d_timer_##Alias##_time.QuadPart += _d_timer_##Alias##_stop_at.QuadPart - _d_timer_##Alias##_start_at.QuadPart;

#define _X_TIMER_REPORT(Alias) \

TRACE(_T("xTimer[") _T(#Alias) _T("] use %d K PFT, "), _d_timer_##Alias##_time.QuadPart >> 10); \

TRACE(_T("runs %d times.\n"), _d_timer_##Alias##_run_times);

#define _X_TIMER_DECLARE(Alias) \

extern LARGE_INTEGER _d_timer_##Alias##_start_at; \

extern LARGE_INTEGER _d_timer_##Alias##_stop_at; \

extern LARGE_INTEGER _d_timer_##Alias##_time; \

extern UINT _d_timer_##Alias##_run_times;

说明：使用时候只要包只要在使用的地方将 Xtimer.h包含一下即可，使用方法如下：

_X_TIMER_DECLARE(RunTime)

_X_TIMER_CREATE(RunTime)

//_X_TIMER_RESET(RunTime)

_X_TIMER_START(RunTime)

// This is the Code which you need to get it's run time.

_X_TIMER_PAUSE(RunTime)

_X_TIMER_REPORT(RunTime)