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Enable specialization of iteration over generators, for gen():, and awaiting coroutines, await coro() #96793

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markshannon opened this issue Sep 13, 2022 · 0 comments
Open
1 of 4 tasks

Enable specialization of iteration over generators, for gen():, and awaiting coroutines, await coro() #96793

markshannon opened this issue Sep 13, 2022 · 0 comments
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performance Performance or resource usage

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@markshannon
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markshannon commented Sep 13, 2022 •
edited by bedevere-bot

We want to be able to specialize iteration over generators and awaiting coroutines. Both for PEP 659 and for higher tier optimizers.

For the theory see faster-cpython/ideas#457

To do this we need:

Edited:
Remove the requirement for a GEN_RETURN_VALUE instruction. We might want one to simplify frame popping, but it isn't needed for specializing.
@markshannon markshannon added the performance Performance or resource usage label Sep 13, 2022
@markshannon markshannon mentioned this issue Sep 13, 2022
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markshannon added a commit that referenced this issue Oct 27, 2022
@markshannon
GH-96793: Change FOR_ITER to not pop the iterator on exhaustion. (G…
22863df 
…H-96801)

Change FOR_ITER to have the same stack effect regardless of whether it branches or not.
Performance is unchanged as FOR_ITER (and specialized forms jump over the cleanup code).
@bedevere-bot bedevere-bot mentioned this issue Oct 27, 2022
Merged
gvanrossum pushed a commit to gvanrossum/cpython that referenced this issue Oct 28, 2022
@markshannon @gvanrossum
pythonGH-96793: Change FOR_ITER to not pop the iterator on exhausti…
97bcfe6 
…on. (pythonGH-96801)

Change FOR_ITER to have the same stack effect regardless of whether it branches or not.
Performance is unchanged as FOR_ITER (and specialized forms jump over the cleanup code).
@bedevere-bot bedevere-bot mentioned this issue Nov 2, 2022
Merged
markshannon added a commit that referenced this issue Nov 3, 2022
@markshannon
GH-96793: Implement PEP 479 in bytecode. (GH-99006)
f4adb97 
* Handle converting StopIteration to RuntimeError in bytecode.

* Add custom instruction for converting StopIteration into RuntimeError.
markshannon added a commit that referenced this issue Nov 7, 2022
@markshannon
GH-96793: Specialize FOR_ITER for generators. (GH-98772)
4a1c58d
@gvanrossum gvanrossum mentioned this issue Nov 8, 2022
Merged
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