[Python-Dev] PEP 580 and PEP 590 comparison.

Jeroen Demeyer J.Demeyer at UGent.be
Sat Apr 27 16:04:28 EDT 2019

On 2019-04-27 11:26, Mark Shannon wrote:
> Performance improvements include, but aren't limited to:
> 1. Much faster calls to common classes: range(), set(), type(), list(),
> etc.

That's not specific to PEP 590. It can be done with any proposal. I know 
that there is the ABI issue with PEP 580, but that's not such a big 
problem as you seem to think (see my last e-mail).

> 2. Modifying argument clinic to produce C functions compatible with the
> vectorcall, allowing the interpreter to call the C function directly,
> with no additional overhead beyond the vectorcall call sequence.

This is a very good point. Doing this will certainly reduce the overhead 
of PEP 590 over PEP 580.

> 3. Customization of the C code for function objects depending on the
> Python code. The would probably be limited to treating closures and
> generator function differently, but optimizing other aspects of the
> Python function call is possible.

I'm not entirely sure what you mean, but I'm pretty sure that it's not 
specific to PEP 590.


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