I actually have ported the pre Lemire version to Java!

https://github.com/PolyhedralDev/Seismic/blob/master/src/main/java/com/dfsek/seismic/math/integer/IntegerFunctions.java

This should work for you, and I can probably port my most recent version to Java as well.

How interesting! What language are you using? I’ve ported a couple of these ilog10 methods to different languages so perhaps I could be of some help! Thank you though! It was a long process to get it this fast and lean!