Python notes on Telegram: “Nelhage’s exploration of CPython’s new tail-call…”

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Post #147 9.59K Jun 8, 2025, 07:41 UTC

Nelhage’s exploration of CPython’s new tail-call interpreter uncovers how an LLVM regression inflated early benchmark gains. This article details computed-goto mechanics, the LLVM 19 regression, and broader lessons in performance engineering.

https://blog.nelhage.com/post/cpython-tail-call/

Made of Bugs Performance of the Python 3.14 tail-call interpreter A deep dive into the performance of Python 3.14's tail-call interpreter: How the performance results were confounded by an LLVM regression, the surprising complexity of compiling interpreter loops, and some reflections on performance work, software engineering…

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