Message 95792 - Python tracker

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Author	mark.dickinson
Recipients	christian.heimes, fredrikj, mark.dickinson, pernici
Date	2009-11-28.16:01:03
SpamBayes Score	5.899789e-09
Marked as misclassified	No
Message-id	<[email protected]>
In-reply-to

Content
I'm going to close this: it's a really nice idea, but after the 30-bit long digits were implemented, the speedup doesn't seem to be worth the extra code complication. The only situation I've found where this optimization really does make a big difference is when using 60-bit digits, but allowing those in Python would take a bit more work (essentially because it requires using some inline assembler to get at the CPU widening multiply and 128-bit-by-64-bit division instructions).

I'm going to close this: it's a really nice idea, but after the 30-bit 
long digits were implemented, the speedup doesn't seem to be worth the 
extra code complication.

The only situation I've found where this optimization really does make a 
big difference is when using 60-bit digits, but allowing those in Python 
would take a bit more work (essentially because it requires using some 
inline assembler to get at the CPU widening multiply and 128-bit-by-64-bit 
division instructions).

History
Date	User	Action	Args
2009-11-28 16:01:05	mark.dickinson	set	recipients: + mark.dickinson, pernici, christian.heimes, fredrikj
2009-11-28 16:01:05	mark.dickinson	set	messageid: <[email protected]>
2009-11-28 16:01:03	mark.dickinson	link	issue3944 messages
2009-11-28 16:01:03	mark.dickinson	create