From owner-cvs-all  Thu Aug 19  7:55:37 1999
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From: Peter Wemm <peter@FreeBSD.org>
Date: Thu, 19 Aug 1999 07:54:41 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/i386/include cpufunc.h
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peter       1999/08/19 07:54:40 PDT

  Modified files:
    sys/i386/include     cpufunc.h 
  Log:
  Undo my previous commit and do it differently.  Break the ffs() etc macros
  into two parts - one to do the bsfl and the other to convert the result
  (base 0) to ffs()-like (base 1) in inline C.  This enables the optimizer
  to be a lot smarter in certain cases, like where it knows that the argument
  is non-zero and we want ffs(known non zero arg) - 1.  This appears to
  produce identical code to the old inline when the argument is unknown.
  
  Revision  Changes    Path
  1.90      +27 -14    src/sys/i386/include/cpufunc.h



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