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Fidget-Spinner merged 1 commit into from
Dec 28, 2025
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gh-139922: Link to results in MSVC tail calling 3.15 #143242

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10 changes: 6 additions & 4 deletions Doc/whatsnew/3.15.rst
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Expand Up @@ -854,11 +854,13 @@ Optimizations

* 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
on the geometric mean of pyperformance on Windows x86-64 over
the switch-case interpreter. We have
observed speedups ranging from 15% for large pure-Python libraries
Results on Visual Studio 18.1.1 report between
`15-20% <https://github.com/faster-cpython/ideas/blob/main/results/5800X-msvc.pgo2-vs-msvc.pgo.tc.svg>`__
speedup on the geometric mean of pyperformance on Windows x86-64 over
the switch-case interpreter on an AMD Ryzen 7 5800X. We have
observed speedups ranging from 14% for large pure-Python libraries
to 40% for long-running small pure-Python scripts on Windows.
This was made possible by a new feature introduced in MSVC 18.
(Contributed by Chris Eibl, Ken Jin, and Brandt Bucher in :gh:`143068`.
Special thanks to the MSVC team including Hulon Jenkins.)

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