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update comment about LLVM bug relevant for --with-tail-call-interp performance #132297

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Merged
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Apr 9, 2025
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update comment about LLVM bug relevant for --with-tail-call-interp performance #132297

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update comment about LLVM bug relevant for --with-tail-call-interp pe…
h-vetinari Apr 9, 2025
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Merge branch 'main' into llvm_bug
Fidget-Spinner Apr 9, 2025
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5 changes: 3 additions & 2 deletions Doc/whatsnew/3.14.rst
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Expand Up @@ -390,8 +390,9 @@ For further information on how to build Python, see
`compiler bug <https://github.com/llvm/llvm-project/issues/106846>`_ found in
Clang/LLVM 19, which causes the normal interpreter to be slower. We were unaware of this bug,
resulting in inaccurate results. We sincerely apologize for
communicating results that were only accurate for certain versions of LLVM 19
and 20. At the time of writing, this bug has not yet been fixed in LLVM 19-21. Thus
communicating results that were only accurate for LLVM v19.1.x and v20.1.0. In the meantime,
the bug has been fixed in LLVM v20.1.1 and for the upcoming v21.1, but it will remain
unfixed for LLVM v19.1.x and v20.1.0. Thus
any benchmarks with those versions of LLVM may produce inaccurate numbers.
(Thanks to Nelson Elhage for bringing this to light.)

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