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jl66Flag for United States of America

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How to calculate time ticks with rdtsc in x86 computer?

want to measure time or ticks with RDTSC.
Could someone shed some light on how to calculate the ticks and time?
Some paper mentioned it by reading time-stamp counter into EDX:EAX, and then manipulating the values to get the ticks, but it did not say how?

 
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Zoppo
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Thanks a lot. It is close to what I requested.