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From: Jason Evans <jasone@FreeBSD.org>
Date: Tue, 4 Apr 2006 03:51:47 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Subject: cvs commit: src/lib/libc/stdlib malloc.c
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jasone      2006-04-04 03:51:47 UTC

  FreeBSD src repository

  Modified files:
    lib/libc/stdlib      malloc.c 
  Log:
  Refactor per-run bitmap manipulation functions so that bitmap offsets only
  have to be calculated once per allocator operation.
  
  Make nil const.
  
  Update various comments.
  
  Remove/avoid division where possible.
  
  For the one division operation that remains in the critical path, add a
  switch statement that has a case for each small size class, and do division
  with a constant divisor in each case.  This allows the compiler to generate
  optimized code that does not use hardware division [1].
  
  Obtained from:  peter [1]
  
  Revision  Changes    Path
  1.121     +131 -69   src/lib/libc/stdlib/malloc.c