Kevin Ryde on Thu, 20 Jan 2022 01:13:38 +0100


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Re: forbidden comparison 

"Ruud H.G. van Tol" <rvtol@isolution.nl> writes:
>
> my( v= 23, c3= 7);
> \\ ...
> my( c= c3 * 2 ); while( c < v, c3= c; c*= 2 ); \\un-oddify
> What are alternative ways to do such?

Logs can give you k shift either right or 1 too big, and compare to see
which.

k = logint(v,2) - logint(c3,2)
c3 <<= k;
if(c3 >= v, c3>>=1)