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| author | Mark Dickinson <dickinsm@gmail.com> | 2010-05-16 08:39:09 +0000 |
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| committer | Mark Dickinson <dickinsm@gmail.com> | 2010-05-16 08:39:09 +0000 |
| commit | ed9f7ea9a19ec0fb3e7790e989ddb20eea0e18af (patch) | |
| tree | ef86c248382d32bb7f6d834ff62da70d4801d731 /Python/pythonrun.c | |
| parent | 1158a5bf47bea3f08b4b370a5d9f7e06aebb308b (diff) | |
| download | cpython-ed9f7ea9a19ec0fb3e7790e989ddb20eea0e18af.tar.gz | |
Blocked revisions 81196 via svnmerge
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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.
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