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From: David Schultz <das@FreeBSD.org>
Date: Sun, 5 Dec 2010 22:11:03 +0000 (UTC)
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Subject: cvs commit: src/lib/msun/src k_log.h k_logf.h
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das         2010-12-05 22:11:03 UTC

  FreeBSD src repository

  Added files:
    lib/msun/src         k_log.h k_logf.h 
  Log:
  SVN rev 216210 on 2010-12-05 22:11:03Z by das
  
  Add a "kernel" log function, based on e_log.c, which is useful for
  implementing accurate logarithms in different bases.  This is based
  on an approach bde coded up years ago.
  
  This function should always be inlined; it will be used in only a few
  places, and rudimentary tests show a 40% performance improvement in
  implementations of log2() and log10() on amd64.
  
  The kernel takes a reduced argument x and returns the same polynomial
  approximation as e_log.c, but omitting the low-order term. The low-order
  term is much larger than the rest of the approximation, so the caller of
  the kernel function can scale it to the appropriate base in extra precision
  and obtain a much more accurate answer than by using log(x)/log(b).
  
  Revision  Changes    Path
  1.1       +116 -0    src/lib/msun/src/k_log.h (new)
  1.1       +55 -0     src/lib/msun/src/k_logf.h (new)