[pypy-dev] gpgpu and pypy

[Carl Friedrich Bolz]

Hi Paolo,

On 08/21/2010 01:46 AM, Paolo Giarrusso wrote:
[...]
> Your mention of slots is very cool! You made me recall that once you
> get shadow classes in Python, you can not only do inline caching, but
> you also have the _same_ object layout as in slots, because adding a
> member causes a hidden class transition, getting rid of any kind of
> dictionary _after compilation_. Two exceptions:
> * an immutable dictionary mapping field names to offsets is used both
> during JIT compilation and when inline caching fails, for
> * a fallback case for when __dict__ is used, I guess, is needed. Not
> necessarily a dictionary must be used though: one could also make
> __dict__ usage just cause class transitions.
> * beyond a certain member count, i.e., if __dict__ is used as a
> general-purpose dictionary, one might want to switch back to a
> dictionary representation. This only applies if this is done in
> Pythonic code (guess not) - I remember this case from V8, for
> JavaScript, where the expected usage is different.
>

Just as a note: PyPy's Python interpreter does all this already, and I 
am working on making it even cooler :-).

[...]

Cheers,

Carl Friedrich