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Re: reading NaNs

This page is part of the web mail archives of SRFI 77 from before July 7th, 2015. The new archives for SRFI 77 contain all messages, not just those from before July 7th, 2015.

On Oct 24, 2005, at 3:32 PM, Aubrey Jaffer wrote:

;;;; integer-sqrt attributed to Bradley Lucier by Steve VanDevender.

I didn't invent this method, I got it from

http://www.cs.cmu.edu/afs/cs/project/ai-repository/ai/lang/lisp/code/ math/isqrt/isqrt.txt

as the thread in Google Groups shows.

This method is about half as fast as the method in

  ;; Derived from the paper "Karatsuba Square Root" by Paul Zimmermann,
  ;; INRIA technical report RR-3805, 1999.  (Used in gmp 4.*)

basically because Zimmermann's method's final divide is half the size of the final divide of the previous method.