#include "SysInfo.h"

#if defined(PLATFORM_WIN32) || defined (PLATFORM_WIN64)
int64 start, end;
unsigned long nCtr, nFreq, nCtrStop;

#if defined(__MINGW32__)
int GetCpuSpeed()
{
    if(!QueryPerformanceFrequency((LARGE_INTEGER *) &nFreq)) 
    	return 0;
    QueryPerformanceCounter((LARGE_INTEGER *)&nCtrStop);
    nCtrStop += nFreq/10000;
    
    __asm__(".byte 0x0F");
    __asm__(".byte 0x31");
    __asm__("mov %eax,_start");
    __asm__("mov %edx,4+(_start)");
	
    do
        QueryPerformanceCounter((LARGE_INTEGER *)&nCtr);
    while (nCtr < nCtrStop);

    __asm__(".byte 0x0F");
    __asm__(".byte 0x31");
    __asm__("mov %eax,_end");
    __asm__("mov %edx,4+(_end)");

    return int((end-start)/100); 
}

#elif defined(_MSC_VER)
int GetCpuSpeed()
{
    if(!QueryPerformanceFrequency((LARGE_INTEGER *) &nFreq)) 
    	return 0;
    QueryPerformanceCounter((LARGE_INTEGER *) &nCtrStop);
    nCtrStop += nFreq/10000;								
    
    start = __rdtsc();
    do 
         QueryPerformanceCounter((LARGE_INTEGER *) &nCtr);
    while (nCtr < nCtrStop);
    end = __rdtsc();
	return int((end-start)/100);
}
#endif 
#endif

#if defined(PLATFORM_POSIX)

#define RDTSC_READ(tm) __asm__ __volatile__ (".byte 0x0f; .byte 0x31" :"=a" (tm))
#define COUNT_SEC   (double)tv.tv_sec + (1.e-6)*tv.tv_usec

int GetCpuSpeed()
{
	struct timeval tv;
  	double cnt1, cnt2;
  	unsigned long start, end;

  	RDTSC_READ(start);
  	gettimeofday(&tv, 0);
  	cnt1 = COUNT_SEC + 0.01;

  	do {
    	gettimeofday(&tv, 0);
    	cnt2 = COUNT_SEC;
  	} while(cnt2 < cnt1);

  	RDTSC_READ(end);

  	return int((end-start)/10000);
}
#endif