title: estimating flop count for division
body: <p>I am wondering why the FLOP-count for division is treated different in literature (and internet).</p>
  
  <p>I have found this definition here at stackoverflow (1div = 4flop):
  <a href="https://stackoverflow.com/a/329243/6059576">https://stackoverflow.com/a/329243/6059576</a></p>
  
  <p>and another one in the book "Matrix Calculations" by Golub &amp; Van Loan (1div = 1 flop)
  <a href="https://books.google.de/books?id=X5YfsuCWpxMC&amp;lpg=PA12&amp;ots=91CiEj4dn-&amp;dq=matrix%20computations%20flop&amp;hl=de&amp;pg=PA12#v=onepage&amp;q=matrix%20computations%20flop&amp;f=false" rel="nofollow noreferrer">https://books.google.de/books?id=X5YfsuCWpxMC&amp;lpg=PA12&amp;ots=91CiEj4dn-&amp;dq=matrix%20computations%20flop&amp;hl=de&amp;pg=PA12#v=onepage&amp;q=matrix%20computations%20flop&amp;f=false</a></p>
  
  <p>and another in "Numerical Computation" by Ueberhuber (1div = 10-30 flop)
  <a href="https://books.google.de/books?id=giH7CAAAQBAJ&amp;lpg=PA21&amp;ots=DtPHO06Eta&amp;dq=numerical%20computation1&amp;hl=de&amp;pg=PA193#v=onepage&amp;q&amp;f=false" rel="nofollow noreferrer">https://books.google.de/books?id=giH7CAAAQBAJ&amp;lpg=PA21&amp;ots=DtPHO06Eta&amp;dq=numerical%20computation1&amp;hl=de&amp;pg=PA193#v=onepage&amp;q&amp;f=false</a></p>
  
  <p>Is there any reference (book,other publication,...) for the first one? Because the Author says</p>
  
  <blockquote>
    <p>..sort of a defacto standard in the HPC community</p>
  </blockquote>