[computer-go] Precise clock cycles measurements

[Mark Boon]

QueryPerformanceCounter() is very precise but also extremely  
expensive. Reminds me somewhat of the Heisenberg uncertainty principle.

Mark

On 4-sep-06, at 07:28, Dave Denholm wrote:

> "Mike Young" <mikewhy at sbcglobal.net> writes:
>
>
>> For VC7.x:
>>
>> typedef TickCount unsigned __int64;
>>
>> __forceinline TickCount GetPerfCount()
>> {    __asm rdtsc;
>> }
>>
>> VC8 removed asm support for rdtsc.
>>
>
> win32 provides a fn  QueryPerformanceCounter() which [probably]
> accesses this timer in a portable way. This should work on all
> versions of windows. As a function call, it might have more overhead
> though.
>
> dd
> -- 
> Dave Denholm              <ddenholm at esmertec.com>       http:// 
> www.esmertec.com
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