[Cython] Utilities, cython.h, libcython

[Stefan Behnel]

Vitja Makarov, 06.10.2011 23:12:
> Here is small comparison on compiling urllib.py with cython:
>
> ((e8527c5...)) vitja at mchome:~/work/cython-vitek-git/zzz$ time python
> ../cython.py urllib.py
>
> real	0m1.699s
> user	0m1.650s
> sys	0m0.040s
> (master) vitja at mchome:~/work/cython-vitek-git/zzz$ time python
> ../cython.py urllib.py
>
> real	0m2.830s
> user	0m2.790s
> sys	0m0.030s
>
>
> It's about 1.5 times slower.

I assume this uses a compiled Cython? That's a pretty serious regression 
for plain Python code then. Again, this needs proper profiling.

We may also want to disable certain steps in the pipeline based on the 
syntax features used. If a feature is not used that has its own (set of) 
visitors, we can disable them completely. Detection already happens based 
on the .pyx/.py distinction, but could additionally use a detector (e.g. in 
the post-parse phase) that sets up skip flags. One example is the closure 
building step, which could be skipped if there are no closures.

Stefan