http://code.google.com/p/rpcs3/source/detail?r=44

Utilities/Timer.h

@@ -0,0 +1,47 @@
+#pragma once
+
+class Timer
+{
+private:
+	bool stopped;
+	double startTimeInMicroSec;
+    double endTimeInMicroSec;
+	LARGE_INTEGER frequency;
+	LARGE_INTEGER startCycle;
+	LARGE_INTEGER endCycle;
+
+public:
+	Timer()
+	{
+		QueryPerformanceFrequency(&frequency);
+		startCycle.QuadPart = 0;
+		endCycle.QuadPart = 0;
+		stopped = false;
+		startTimeInMicroSec = 0;
+		endTimeInMicroSec = 0;
+	}
+
+	void Start()
+	{
+		stopped = false;
+		QueryPerformanceCounter(&startCycle);
+	}
+
+	void Stop()
+	{
+		stopped = true;
+		QueryPerformanceCounter(&endCycle);
+	}
+
+	double GetElapsedTimeInSec(){return GetElapsedTimeInMicroSec() / 1000000.0;}
+    double GetElapsedTimeInMilliSec(){return GetElapsedTimeInMicroSec() / 1000.0;}
+    double GetElapsedTimeInMicroSec()
+	{
+		if(!stopped) QueryPerformanceCounter(&endCycle);
+		
+		startTimeInMicroSec = startCycle.QuadPart * (1000000.0 / frequency.QuadPart);
+		endTimeInMicroSec = endCycle.QuadPart * (1000000.0 / frequency.QuadPart);
+
+		return endTimeInMicroSec - startTimeInMicroSec;
+	}
+};