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GH-139922: update 3.15 whatsnew: Windows 64-bit binaries now use the tail-calling interpreter by chris-eibl · Pull Request #146391 · python/cpython · GitHub

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GH-139922: update 3.15 whatsnew: Windows 64-bit binaries now use the tail-calling interpreter - #146391

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hugovk merged 8 commits into
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chris-eibl:msvc_tc_update_3.15.rst
Mar 27, 2026
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GH-139922: update 3.15 whatsnew: Windows 64-bit binaries now use the tail-calling interpreter#146391
hugovk merged 8 commits into
python:mainfrom
chris-eibl:msvc_tc_update_3.15.rst

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chris-eibl commented Mar 24, 2026 •
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update 3.15 whatsnew: Windows 64-bit binaries
682055e 
now use the tail-calling interpreter
chris-eibl requested a review from AA-Turner as a code owner March 24, 2026 20:03
bedevere-app Bot added docs Documentation in the Doc dir skip news labels Mar 24, 2026
bedevere-app Bot mentioned this pull request Mar 24, 2026
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chris-eibl requested review from Fidget-Spinner and hugovk and removed request for AA-Turner March 24, 2026 20:03
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Comment thread Doc/whatsnew/3.15.rst Outdated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 Mar 24, 2026 •
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

I think technically you contributed this build change and not me nor the rest of us though?

chris-eibl Mar 24, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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?

zooba reviewed Mar 25, 2026
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Shall we update the entry in the release highlights?

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

->

?

Comment thread Doc/whatsnew/3.15.rst Outdated
Comment thread Doc/whatsnew/3.15.rst Outdated
chris-eibl and others added 2 commits March 25, 2026 16:44
Update Doc/whatsnew/3.15.rst
f1415a7 
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Update Doc/whatsnew/3.15.rst
84fb115 
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

chris-eibl commented Mar 25, 2026

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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?

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

chris-eibl commented Mar 25, 2026

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I think an entry would fit nicely there 👍

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!

Fidget-Spinner reviewed Mar 26, 2026
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Thanks!

hugovk merged commit 2e64e36 into python:main Mar 27, 2026
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github-project-automation Bot moved this from Todo to Done in Docs PRs Mar 27, 2026

hugovk commented Mar 27, 2026

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Thanks!

chris-eibl deleted the msvc_tc_update_3.15.rst branch March 27, 2026 11:57
pablogsal mentioned this pull request Apr 4, 2026
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clin1234 pushed a commit to clin1234/cpython that referenced this pull request Apr 16, 2026
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 <1324225+hugovk@users.noreply.github.com>
ljfp pushed a commit to ljfp/cpython that referenced this pull request Apr 25, 2026
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 <1324225+hugovk@users.noreply.github.com>
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