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GeezerVison is showing github.com — GH-139922: update 3.15 whatsnew: Windows 64-bit binaries now use the tail-calling interpreter by chris-eibl · Pull Request #146391 · python/cpython

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@chris-eibl

@chris-eibl chris-eibl commented Mar 24, 2026 •
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  • Issue: Tail calling interpreter for MSVC #139922

📚 Documentation preview 📚: https://cpython-previews--146391.org.readthedocs.build/

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@chris-eibl
update 3.15 whatsnew: Windows 64-bit binaries
682055e 
now use the tail-calling interpreter
@chris-eibl
chris-eibl requested a review from AA-Turner as a code owner March 24, 2026 20:03
@bedevere-app bedevere-app Bot added docs Documentation in the Doc dir skip news labels Mar 24, 2026
@github-project-automation github-project-automation Bot added this to Docs PRs Mar 24, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Mar 24, 2026
Tail calling interpreter for MSVC #139922
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@bedevere-app bedevere-app Bot added the awaiting review label Mar 24, 2026
@github-project-automation github-project-automation Bot moved this to Todo in Docs PRs Mar 24, 2026
@chris-eibl
chris-eibl requested review from Fidget-Spinner and hugovk and removed request for AA-Turner March 24, 2026 20:03
@chris-eibl
ref link the new tail-calling interpreter
22277d9
Fidget-Spinner
Fidget-Spinner reviewed Mar 24, 2026
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Comment thread Doc/whatsnew/3.15.rst Outdated

* The official Windows 64-bit binaries on python.org__ are now using the new
:ref:`tail-calling interpreter <whatsnew314-tail-call-interpreter>` since Python 3.15.0a8.
(Contributed by Ken Jin, Brandt Bucher and Chris Eibl in :gh:`143068`.

@Fidget-Spinner Fidget-Spinner Mar 24, 2026 •
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I think technically you contributed this build change and not me nor the rest of us though?

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@chris-eibl chris-eibl Mar 24, 2026

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Yupp, I've done python/release-tools#346 with @zooba's help. Don't think we can / do link to release-tools here?

Thus, I've re-used the wording of #143068 blurb.

Maybe just link to https://docs.python.org/3.15/whatsnew/3.15.html#optimizations?

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@chris-eibl
use issue instead of PR
66ad26d
zooba
zooba reviewed Mar 25, 2026
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Comment thread Doc/whatsnew/3.15.rst Resolved

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Shall we update the entry in the release highlights?

https://docs.python.org/3.15/whatsnew/3.15.html#summary-release-highlights

  • The JIT compiler has been significantly upgraded

->

  • The JIT compiler has been significantly upgraded and is now used for the [official Windows 64-bit binaries](link to a ref in the build section)

?

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Comment thread Doc/whatsnew/3.15.rst Resolved

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chris-eibl and others added 2 commits March 25, 2026 16:44
@chris-eibl @hugovk
Update Doc/whatsnew/3.15.rst
f1415a7 
Co-authored-by: Hugo van Kemenade <[email protected]>
@chris-eibl @hugovk
Update Doc/whatsnew/3.15.rst
84fb115 
Co-authored-by: Hugo van Kemenade <[email protected]>
@chris-eibl

chris-eibl commented Mar 25, 2026

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  • The JIT compiler has been significantly upgraded and is now used for the [official Windows 64-bit binaries](link to a ref in the build section)

The JIT is already included in 3.14 and off per default (--experimental-jit-off) and the same setting is used for 3.15.
So I am unsure about adding the link, especially using now as this might suggest that it was not the case earlier?
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@hugovk

hugovk commented Mar 25, 2026

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Sorry, I mixed up two unrelated things there! Let's try again:

Shall we add a new entry in the release highlights about using the tail-calling interpreter for Windows 64-bit binaries?

https://docs.python.org/3.15/whatsnew/3.15.html#summary-release-highlights
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@chris-eibl

chris-eibl commented Mar 25, 2026

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I think an entry would fit nicely there 👍
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@vstinner

vstinner commented Mar 25, 2026

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Windows 64-bit binaries now use the tail-calling interpreter

Yeah! That's cool, good job!
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@chris-eibl
add to release highlights
b3c2f08
Fidget-Spinner
Fidget-Spinner reviewed Mar 26, 2026
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@chris-eibl
Merge the two news entries
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@chris-eibl
add Steve again. yes yes yes!
cc4302d
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Thanks!

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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting review labels Mar 26, 2026
@hugovk
hugovk merged commit 2e64e36 into python:main Mar 27, 2026
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@github-project-automation github-project-automation Bot moved this from Todo to Done in Docs PRs Mar 27, 2026
@hugovk

hugovk commented Mar 27, 2026

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Thanks!
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@bedevere-app bedevere-app Bot removed the awaiting merge label Mar 27, 2026
@chris-eibl
chris-eibl deleted the msvc_tc_update_3.15.rst branch March 27, 2026 11:57
@pablogsal pablogsal mentioned this pull request Apr 4, 2026
gh-130273: Fix traceback color output with unicode characters #142529
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clin1234 pushed a commit to clin1234/cpython that referenced this pull request Apr 16, 2026
@chris-eibl @hugovk @clin1234
pythonGH-139922: update 3.15 whatsnew: Windows 64-bit binaries now us…
2b530a3 
…e the tail-calling interpreter (python#146391)

Co-authored-by: Hugo van Kemenade <[email protected]>
ljfp pushed a commit to ljfp/cpython that referenced this pull request Apr 25, 2026
@chris-eibl @hugovk @ljfp
pythonGH-139922: update 3.15 whatsnew: Windows 64-bit binaries now us…
891bc4a 
…e the tail-calling interpreter (python#146391)

Co-authored-by: Hugo van Kemenade <[email protected]>
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@hugovk hugovk hugovk left review comments
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@chris-eibl @hugovk @vstinner @zooba @Fidget-Spinner
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