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GH-139922: add interpreter types to InternalDocs/interpreter.md#148035

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Fidget-Spinner merged 4 commits into
python:mainpython/cpython:mainfrom
chris-eibl:tc-doc-updatechris-eibl/cpython:tc-doc-updateCopy head branch name to clipboard
Apr 5, 2026
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GH-139922: add interpreter types to InternalDocs/interpreter.md#148035
Fidget-Spinner merged 4 commits into
python:mainpython/cpython:mainfrom
chris-eibl:tc-doc-updatechris-eibl/cpython:tc-doc-updateCopy head branch name to clipboard

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@chris-eibl

@chris-eibl chris-eibl commented Apr 3, 2026

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And explain some musttail peculiarities.

@chris-eibl chris-eibl requested a review from AA-Turner as a code owner April 3, 2026 13:39
@bedevere-app bedevere-app Bot added awaiting review docs Documentation in the Doc dir skip news labels Apr 3, 2026
@github-project-automation github-project-automation Bot moved this to Todo in Docs PRs Apr 3, 2026
@chris-eibl chris-eibl requested review from Fidget-Spinner and removed request for AA-Turner April 3, 2026 13:39
Comment thread InternalDocs/interpreter.md Outdated
Comment on lines +536 to +539
also on the optimization level. [Introducing additional scopes](https://github.com/python/cpython/blob/3908593039bde9d4b591ab09919003ee57418d64/Python/bytecodes.c#L2526),
[extracting problematic code paths into a separate function](https://github.com/python/cpython/pull/143068/files#diff-729a985b0cb8b431cb291f1edb561bbbfea22e3f8c262451cd83328a0936a342R3724)
or [returning a pointer instead of taking it as an output parameter](https://github.com/python/cpython/blob/3908593039bde9d4b591ab09919003ee57418d64/Include/internal/pycore_ceval.h#L489-L492)
is particularly helpful to the MSVC compiler in this regard. Using `restrict` is another (currently unused) remedy.

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It would be better to place this as a bullet list:

The following remedies work:
...

[preserve_none](https://clang.llvm.org/docs/AttributeReference.html#preserve-none)
calling convention between the small C functions that implement individual Python opcodes.

Not all compilers support these and if they do not all targets might be supported (for example,

@chris-eibl chris-eibl Apr 3, 2026

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See #148036 for a (current) list of supported MSVC configurations.

@Fidget-Spinner Fidget-Spinner merged commit 668c572 into python:main Apr 5, 2026
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@github-project-automation github-project-automation Bot moved this from Todo to Done in Docs PRs Apr 5, 2026
@chris-eibl chris-eibl deleted the tc-doc-update branch April 5, 2026 15:34
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