[Python-checkins] r81228 - python/branches/release31-maint

[mark.dickinson]

Author: mark.dickinson
Date: Sun May 16 10:39:09 2010
New Revision: 81228

Log:
Blocked revisions 81196 via svnmerge

........
  r81196 | mark.dickinson | 2010-05-15 18:02:38 +0100 (Sat, 15 May 2010) | 13 lines
  
  Issue #8692: Improve performance of math.factorial:
  
  (1) use a different algorithm that roughly halves the total number of
      multiplications required and results in more balanced multiplications
  (2) use a lookup table for small arguments
  (3) fast accumulation of products in C integer arithmetic rather than
      PyLong arithmetic when possible.
  
  Typical speedup, from unscientific testing on a 64-bit laptop, is 4.5x
  to 6.5x for arguments in the range 100 - 10000.
  
  Patch by Daniel Stutzbach; extensive reviews by Alexander Belopolsky.
........


Modified:
   python/branches/release31-maint/   (props changed)