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GeezerVison is showing github.com — gh-139922: Add tail call for MSVC for whats new in 3.15 by Fidget-Spinner · Pull Request #143087 · python/cpython

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@Fidget-Spinner

@Fidget-Spinner Fidget-Spinner commented Dec 22, 2025 •
edited by github-actions Bot
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  • Issue: Tail calling interpreter for MSVC #139922

📚 Documentation preview 📚: https://cpython-previews--143087.org.readthedocs.build/

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Fidget-Spinner added 2 commits December 22, 2025 23:23
@Fidget-Spinner
Add tail call for MSVC for whats new in 3.15
c094cf8
@Fidget-Spinner
nit
c6cb242
@Fidget-Spinner
Fidget-Spinner requested a review from AA-Turner as a code owner December 22, 2025 23:24
@bedevere-app bedevere-app Bot added docs Documentation in the Doc dir skip news labels Dec 22, 2025
@github-project-automation github-project-automation Bot added this to Docs PRs Dec 22, 2025
@github-project-automation github-project-automation Bot moved this to Todo in Docs PRs Dec 22, 2025
@bedevere-app bedevere-app Bot added the awaiting core review label Dec 22, 2025
@bedevere-app bedevere-app Bot mentioned this pull request Dec 22, 2025
Tail calling interpreter for MSVC #139922
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@Fidget-Spinner
nit
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pablogsal
pablogsal reviewed Dec 22, 2025
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Comment thread Doc/whatsnew/3.15.rst

* Builds using Visual Studio 2026 (MSVC 18) may now use the new
:ref:`tail-calling interpreter <whatsnew314-tail-call-interpreter>`.
Results on an early experimental MSVC compiler reported roughly 15% speedup

@pablogsal pablogsal Dec 22, 2025

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is there a way to clarify the experimental version this was measured in (i.e. put the version or whatever in parens)

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@Fidget-Spinner Fidget-Spinner Dec 22, 2025

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Good point. As far as I understand, it was an internal MSVC build in MS, which I can't access, so we will never know :(.

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pablogsal
pablogsal approved these changes Dec 22, 2025
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LGTM

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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting core review labels Dec 22, 2025
@Fidget-Spinner
Fidget-Spinner merged commit 714037b into python:main Dec 22, 2025
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Fidget-Spinner deleted the tail-call-whatsnew-315 branch December 22, 2025 23:56
@bedevere-app bedevere-app Bot removed the awaiting merge label Dec 22, 2025
@github-project-automation github-project-automation Bot moved this from Todo to Done in Docs PRs Dec 22, 2025
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@pablogsal pablogsal pablogsal approved these changes
@AA-Turner AA-Turner Awaiting requested review from AA-Turner AA-Turner is a code owner

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@Fidget-Spinner @pablogsal
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