Pernici Mario <[EMAIL PROTECTED]> added the comment: Yes, I think that the speed-up is due to reducing the number of shifts and masks.
Changing PyLong_SHIFT to 16 would be complicated; for instance in v_iadd() carry could not be a digit of 16 bits anymore; writing code specific for 64 bit machines would surely improve performance; maybe with PyLong_SHIFT=30 few changes to the code would be needed? I did not modify the case a = b. I changed the documentation, which was wrong, adding detailed bounds on carry in the various steps to check that it does not overflow. I corrected the wrong assertion (carry <= PyLong_MASK). ---------- keywords: +patch Added file: http://bugs.python.org/file11595/longobject1.diff _______________________________________ Python tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue3944> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
