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Internet Message Format  |  1996-08-05  |  708 b 
  1. Path: news.itd.umich.edu!usenet
  2. From: Chris Lahey <clahey@umich.edu>
  3. Newsgroups: comp.lang.c
  4. Subject: Re: Fastest way to computer log(base2) of x?
  5. Date: 24 Jan 1996 22:56:31 GMT
  6. Organization: University of Michigan
  7. Message-ID: <4e6dev$ksl@lastactionhero.rs.itd.umich.edu>
  8. References: <4e61iu$p6e@villa.fc.net>
  9. NNTP-Posting-Host: rep00703.reshall.umich.edu
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  15.  
  16. Depending on the speed of your FPU doing (int) log((double)x) / log(2.0) might
  17. be faster than checking each digit.  I have absolutely no idea which is faster.
  18.      Chris
  19.  
  20.