You right. Sorry, I missed changes in ceval.c for py3k.
Please note, simple test like:
from timeit import timeit
print('list', timeit("l[0]", "l = [1]"))
print('tuple', timeit("l[0]", "l = (1,)"))
Has results:
andrew@ocean ~/p/cpython> python2.7 z.py
('list', 0.03479599952697754)
('tuple', 0.046610116958618164)
andrew@ocean ~/p/cpython> python3.2 z.py
list 0.04870104789733887
tuple 0.04825997352600098
For python2.7 list[int] microoptimization saves 25-30%, while 3.2 (and
trunk) very close to "unoptimized" 2.7 version.
On Sun, Jul 24, 2011 at 2:27 AM, Antoine Pitrou <solip...@pitrou.net> wrote:
> On Sun, 24 Jul 2011 09:13:07 +1000
> Ryan Kelly <r...@rfk.id.au> wrote:
>>
>> In latest trunk this optimisation seems to have gone away, the code is
>> now:
>>
>> TARGET(BINARY_SUBSCR)
>> w = POP();
>> v = TOP();
>> x = PyObject_GetItem(v, w);
>> Py_DECREF(v);
>> Py_DECREF(w);
>> SET_TOP(x);
>> if (x != NULL) DISPATCH();
>> break;
>>
>> The implementation of PyObject_GetItem doesn't appear to have changed
>> though. Maybe this optimisation was no longer worth it in practice?
>
> The optimization was probably removed because PyInt objects don't exist
> anymore. There's a related but more ambitious patch at
> http://bugs.python.org/issue10044.
>
> In practice however, such micro-optimizations usually have little or no
> effect.
>
> Regards
>
> Antoine.
>
>
> _______________________________________________
> Python-Dev mailing list
> Python-Dev@python.org
> http://mail.python.org/mailman/listinfo/python-dev
> Unsubscribe:
> http://mail.python.org/mailman/options/python-dev/andrew.svetlov%40gmail.com
>
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
http://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
