Mark Dickinson <dicki...@gmail.com> added the comment: Thanks for those results, Collin.
> By benchmark should be reproduced on a 64 bits CPU with 2^15 and 2^30 > bases for the long type. On OS X 10.6 (64-bit Python non-debug non-framework build with gcc 4.2 from Apple, 30-bit long digits, straight ./configure && make), Victor's benchmark gives me the following results: original = 1023.9 ms (best of 10 runs) patched = 1005.3 ms (best of 10 runs). - a speedup of about 1.85%. So it looks as though x86_64 doesn't benefit to the same extent that 32-bit does. Presumably that's because gcc-4.2 is unable or unwilling to turn a 64-bit by 64-bit division with a constant dividend of 10**9 into a multiplication; I don't know whether using a later gcc would make a difference. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue6713> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
