[Cython] [cython] Initial startswith / endswith optimization (#35)

[Robert Bradshaw]

On Thu, May 26, 2011 at 1:43 AM, Stefan Behnel <stefan_ml at behnel.de> wrote:
> Dag Sverre Seljebotn, 26.05.2011 10:24:
>>
>> On 05/26/2011 10:12 AM, Stefan Behnel wrote:
>>>
>>> Robert Bradshaw, 26.05.2011 09:40:
>>>>
>>>> the pattern of swapping out builtin methods (and perhaps
>>>> functions) with more optimized C versions is something that perhaps it
>>>> would be good to be able to do more generally, rather than hard coding
>>>> the list into Optimize.py.
>>>
>>> Right. All that would really be needed is a way to define default values
>>> for arguments of builtin methods. Then most of the method optimisations
>>> could be moved into Builtin.py.
>>
>> BTW, the idea of the overlay stuff Robert referred to was that we could
>> add
>> syntax to pxd files so that the "unicode" type and its alternative method
>> implementations could be fleshed out in a pxd file (and the same with
>> other
>> standard library or third-party types that are not written with Cython
>> support in mind, but may have a C API that we want to dispatch to instead
>> of their Python API).
>
> Well, dispatching to existing C-API functions is easy and can be done in
> Builtin.py. Moving that to .pxd files or not is a minor detail. The
> problems, as in this case, are that we often need to implement our own C-API
> and that we need to match defaulted arguments to suitable default values. I
> guess this could be done with inline methods, once we have something like
> overlay types in .pxd files.

Yes, I was thinking that many of these could be implemented in Cython.
We sometimes do tricky stuff with #defines though, but usually on the
Python version which could possibly be supported somehow (?). At
least, as we move away from the low-level ones and start expanding,
implementing them in Cython makes more and more sense.

> What's the status of Cython implemented utility code, BTW?
>
> Stefan
> _______________________________________________
> cython-devel mailing list
> cython-devel at python.org
> http://mail.python.org/mailman/listinfo/cython-devel
>