On 8/15/06, "Martin v. Löwis" <martin at v.loewis.de> wrote: > > That penalty is already paid today. Much code dealing with > ints has a type test whether it's an int or a long. If > int and long become subtypes of each other or of some abstract > type, performance will decrease even more because a subtype > test is quite expensive if the object is neither int nor > long (it has to traverse the entire base type hierarchy to > find out its not inherited from int). I was playing around with a little patch to avoid that penalty. It doesn't take any additional memory, just a handful of bits we aren't using. :-) For the more common builtin types, it stores whether it's a subclass in tp_flags, so there's no function call necessary and it's a constant time operation. It was faster when doing simple stuff. Haven't thought much whether this is really worthwhile or not. n -------------- next part -------------- A non-text attachment was scrubbed... Name: fast-sub.diff Type: text/x-diff Size: 6669 bytes Desc: not available Url : http://mail.python.org/pipermail/python-dev/attachments/20060815/4a362cc4/attachment.bin
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4