In the meantime I''ve expanded the app to a little class:
class CClock{public: CClock(); ~CClock(); //Start the timer inline void Reset(void); //Obtain the timer time since last reset. inline unsigned long ElapsedMilliseconds(void); inline unsigned long ElapsedClockCycles(void);private: __int64 Freq; //Clock cycles per millisecond. __int64 Start; __int64 End; __int64 Delta; __int64 Overhead;}; CClock::CClock(){ __int64 Freq =0; //Clock cycles per millisecond. __int64 Start =0; __int64 End =0; __int64 Delta =0; __int64 Overhead=0; //If this fails the frequency (freq) will remain 0. QueryPerformanceFrequency((LARGE_INTEGER*)&Freq); //Calculate Overhead Reset(); ElapsedClockCycles(); Overhead = Delta;}inline void CClock::Reset(void){ Sleep(0); //A thread can relinquish the remainder of its time slice by calling //this function with a sleep time of zero milliseconds. We do this to //ensure short timings arn''t interupted by the scheduler. (Average //desktop schedule time is 40ms) if (Freq) { __int64 tempStart=0; __asm { __emit 0x0f // RDTSC - read time-stamp counter __emit 0x31 mov dword ptr [tempStart],eax mov dword ptr [tempStart+4],edx } Start=tempStart; } else Start = (__int64)(GetTickCount()*1000);}inline unsigned long CClock::ElapsedMilliseconds(void){ if (Freq) { __int64 tempEnd=0; __asm { __emit 0x0f // RDTSC - read time-stamp counter __emit 0x31 mov dword ptr [tempEnd],eax mov dword ptr [tempEnd+4],edx } End=tempEnd; } else End = (__int64)(GetTickCount()*1000); return (unsigned long)(1000*(End-Start));}inline unsigned long CClock::ElapsedClockCycles(void){ __int64 tempEnd=0; __asm { __emit 0x0f // RDTSC - read time-stamp counter __emit 0x31 mov dword ptr [tempEnd],eax mov dword ptr [tempEnd+4],edx } End=tempEnd; Delta = End - Start - Overhead; return (unsigned long)(Delta);}void main (void){ CClock *Clock = new CClock; Clock->Reset(); cout << Clock->ElapsedClockCycles();} However this returns grossly incorrect results in release mode. Now since I added a little more code now it''s grossly wrong in debug as well. I *think* that when you get problems between release and debug it means uninitialised variables.
I performed a test. The Freq variable in release mode doesn''t seem to retain it''s data once I leave the constructor... Whats up with that? Its a class scope variable???
The other problem I seem to have here is that My class private data is not available from within the assembler. Should I be able to do that?
gimp
