New submission from Richard Saunders :
In discussions of memcmp performance, (http://www.picklingtools.com/study.pdf)
it was noted how well Python 2.7 can take advantage of faster memcmps (indeed,
the rich comparisons are all memcmp calls).
There have been some discussion on python
Richard Saunders added the comment:
This is a potential patch:
I believe it follows the C-style of PEP 7
There is a test as well, testing 1 and 2 byte kinds.
I have run it through the python tests and have added no new breakages
(there were some tests that failed, but they failed with and
Richard Saunders added the comment:
Here's a test demonstrating the memcmp optimization effect:
---
more ~/PickTest5/Python/string_test3.py
a = []
b = []
c = []
d = []
for x in range(0,1000) :
a.append("the quick brown
Richard Saunders added the comment:
Added branches for specializing for UCS2 and UCS4 types
--
Added file:
http://bugs.python.org/file23574/unicode_with_memcmp_and_ucs_specialization.patch
___
Python tracker
<http://bugs.python.org/issue13
Richard Saunders added the comment:
Some more information:
Bob Arendt and I have been playing with the Fedora Core .spec file
for python on Fedora Core 15:
the compile options we found seem to automatically (as we did non invoke
this option) invoke '-fno-builtin-memcmp' so
