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why is down counter more efficient than up counter

Harry_dh

Hi!

I have a question. Why is down coutner more efficient than up counter?

In CMSDK, all of timers are with down-counter. I think there is a reason that ARM utilized down-counter except up-counter.

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    This is a common optimization, as comparing with zero is a standard operation, vs comparing against an arbitrary ceiling value.

    You will also see this in code, for example:

    for (i=0; i<MAX_VALUE; i++)...

    Is typically less efficient than:

    for(i=MAX_VALUE; i>0; i--)...

    Regards

    Ronan

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  • 0

    This is a common optimization, as comparing with zero is a standard operation, vs comparing against an arbitrary ceiling value.

    You will also see this in code, for example:

    for (i=0; i<MAX_VALUE; i++)...

    Is typically less efficient than:

    for(i=MAX_VALUE; i>0; i--)...

    Regards

    Ronan

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