[Cython] Assignments in cdefs

[Dag Sverre Seljebotn]

Stefan Behnel wrote:
> Hi,
> 
> Dag Sverre Seljebotn wrote:
>> Stefan Behnel wrote:
>>> What about code like this:
>>>
>>>     def test(a):
>>>        cdef int c
>>>        if a:
>>>            c = 1
>>>        if not a:
>>>            c = 2
>>>
>>> How would you know what is a "first assignment" here? And what would you gain
>>> from your ref-counting optimisation in this case?
>> As for the example, it is a "best-effort" thing. If no assignments are 
>> flagged as first, then the optimization just doesn't happen, which is 
>> the likely outcome of your example.
> 
> Then what exactly is your "ref-counting optimisation" doing? Can you give me a
> code example?

It makes "cdef int x = 3" behave as before, no more or less. Just 
refactoring the code so that buffer worked. I needed to put the stuff 
that handled the difference in refcounting somewhere, and that somewhere 
leaves a hole in which to plug further improvements, so it was a natural 
name, but it doesn't mean that it is more optimized than it used to be.

-- 
Dag Sverre