Wanted: Efficient Algorithm to Square an Integer Number

[David Hayden]

On any modern CPU, it's likely that multiplying a number by itself will be about as fast as it gets.

If you're just looking for the intellectual joy, here's the book that we used for my "Computer Arithmetic" course in 1986. It was a real eye-opener: redundant number systems, fast carries, wallace trees, all sorts of cool stuff. I took the course from the author.
https://www.amazon.com/Computer-Number-S...0131642111