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Posted 30 Jul 2003

High performance computing from C++ to MMX

, 30 Jul 2003
Boosting you application performance to the optimum by using hardware acceleration.
// Elapsed.cpp: implementation of the CElapsed class.

#include "stdafx.h"
#include "Elapsed.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW

// Construction/Destruction

	// get the frequency of the counter
	m_iInitialized = QueryPerformanceFrequency( (LARGE_INTEGER *)&m_iFrequency );



BOOL CElapsed::Begin()    // start timing
	if (!m_iInitialized)
		return 0;   // error - couldn't get frequency

	// get the starting counter value
	return QueryPerformanceCounter( (LARGE_INTEGER *)&m_iBeginTime );

double CElapsed::End()    // stop timing and get elapsed time in seconds
	if (!m_iInitialized )
		return 0.0; // error - couldn't get frequency

	// get the ending counter value
	__int64 endtime;
	QueryPerformanceCounter( (LARGE_INTEGER *)&endtime );

	// determine the elapsed counts
	__int64 elapsed = endtime - m_iBeginTime;

	// convert counts to time in seconds and return it
	m_dElapsed = (double)elapsed / (double)m_iFrequency;
	return m_dElapsed;

BOOL CElapsed::Available()  // returns true if the perf counter is available
	return m_iInitialized; 

__int64 CElapsed::GetFreq() // return perf counter frequency as large int
	return m_iFrequency; 

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About the Author

Vincent Leong77
Web Developer Cortex Imaging
Malaysia Malaysia
Interest in computer vision, biometrics, image processing & software optimizations. Known language C/C++, VC++ MFC, Win32, COM/ATL, Assembly.

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