On Tue, Mar 24, 2009 at 10:13 AM, Mark Dickinson <dicki...@gmail.com> wrote:
> 2009/3/24 Daniel Stutzbach <dan...@stutzbachenterprises.com>: > > [...] > > 100 nanoseconds, py3k trunk: > > ceval -> PyObject_GetItem (object.c) -> list_subscript (listobject.c) -> > > PyNumber_AsSsize_t (object.c) -> PyLong_AsSsize_t (longobject.c) > > [more timings snipped] > > Does removing the PyLong_Check call in PyLong_AsSsize_t > make any noticeable difference to these timings? > Making no other changes from the trunk, removing the PyLong_Check and NULL check from PyLong_AsSsize_t shaves off 4 nanoseconds (or around 4% since the trunk is around 100 nanoseconds). Here's what I'm testing with, by the way: ./python.exe Lib/timeit.py -r 10 -s 'x = list(range(10))' 'x[5]' -- Daniel Stutzbach, Ph.D. President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>
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