[mypyc] feat: stararg fastpath when calling fn(*args) with tuple#19623
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JukkaL merged 8 commits intopython:masterfrom Aug 13, 2025
Merged
[mypyc] feat: stararg fastpath when calling fn(*args) with tuple#19623JukkaL merged 8 commits intopython:masterfrom
JukkaL merged 8 commits intopython:masterfrom
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@JukkaL @ilevkivskyi I notice other people are somehow Requesting Review for other PRs via the Github UI. I couldn't figure out how to do that but this PR is nice and short, and ready for review. |
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Nice win! Constructing objects is slow so this should help (didn't benchmark though).
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Yeah I also didn't think to do any benchmarking here since the IR shows such a clear improvement. Thanks for merging, I'll rebase those other 3 related PRs for you sometime today. |
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… generic sequences (#19629) This PR extends #19623 with additional logic for handling non-tuple star inputs Now, we can use the fast path for any arbitrary sequence, in addition to tuples. I opted to separate this PR from 19623 to keep them smaller and easier to review, and to declutter the changes in the IR.
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This PR adds a new custom_op for PyObject_CallObject which is more efficient than PyObject_Call in cases where there are no kwargs. posarg-only use cases are already optimized but this is helpful for patterns such as `fn(*args)` or `fn(a1, a2, *args)` This PR extends #19623 and #19629 , as this change will not be helpful until those PRs are merged.
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There are 3 safe cases where we can reuse a tuple when calling a python function:
fn(*args)
fn(*args, **kwargs)
fn(*args, k=1, k2=2, **kwargs)
This PR covers the first two cases.
The IR diff will probably demonstrate this change better than I can explain it.