Neal Norwitz wrote: > 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. This might als be helpful when exceptions have to inherit from BaseException in Py3k. Georg
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