Re: Count Leading Zeros (cntlzw)

"Kostas" <kostast@xxxxxxxx> a écrit dans le message de
news:4312e683@xxxxxxxxxxxxxxxxxxxxxxxxx
> I wanted to use this function -which is part of the PowerPC assembly
> language- in a x86 architecture (prefered an Athlon).
> This function calculates the leading zeros of a word.
> I need this function to be really fast, so i thought to ask the basm group
> :)
>
> How should it be best implemented in order to be best optimised?
>
> Thanks in advance
> Kostas
>

80x86 have BSF (Bit Scan Forward) and BSR (B.S. Reverse) functions


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