Another (stupid) question: "find first set" (or "find first zero")

[dbm at refined-audiometrics.com]

(1- (integer-length x))


> On Feb 1, 2021, at 1:24 AM, Marco Antoniotti <marco.antoniotti at unimib.it> wrote:
> 
> Hi
> 
> I am wasti....  devoting some time to recreational hacking and I bumped into an interesting bit fiddling operation.
> 
> I pored over the CLHS, but, while I may have missed something obvious, I am not sure what would be the best way to implement such a function using the standard operations.
> 
> Any ideas?
> 
> Note that it appears that most HW does have an instruction to do that directly.
> Find first set - Wikipedia <https://en.wikipedia.org/wiki/Find_first_set> 
> 
> Thanks
> Marco
> 
> -- 
> Marco Antoniotti, Associate Professor        		tel. +39 - 02 64 48 79 01
> DISCo, Università Milano Bicocca U14 2043		http://bimib.disco.unimib.it <http://bimib.disco.unimib.it/>
> Viale Sarca 336
> I-20126 Milan (MI) ITALY

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