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Le 29/12/2017 à 12:48, Mark Shannon a écrit :
> 
> Why all these competing pull requests? It does feel like my original patch has been hijacked.
The original patch had a number of issues which needed to be fixed (in
addition to forward-port it to the latest git master), such as not
fixing some cases of stack consumption calculation.
> Also, before any more PRs, we need to decide whether to use subroutines or code duplication for finally blocks.
> 
> Here is my attempt at an objective comparison of the two approaches.
> 
> JSR style Code duplication
> Speed Slower Faster
> Interpreter More complex Simpler
> Bytecode generation Simpler More complex
> Bytecode size ~ +0.1% ~ +0.4%
Actually, when looking at your original patch
(https://bugs.python.org/review/17611/) vs. Serhiy's
https://github.com/python/cpython/pull/5006/, it looks like interpreter
complexity is the same. Speed also seems to not be significantly
different. So I would rephrase it as (compared to legacy bytecode
generation):
 Subroutine Code duplication
Speed Same Insignificantly faster
Interpreter Simpler Simpler
Bytecode generation Slightly more complex Slightly more complex
Bytecode size ~ +0.1% ~ +0.4%
That said, if you want to submit an updated version of the code
duplication approach (with the same amount of added tests and
debugging), we could compare on more equal grounds.