https://github.com/python/cpython/commit/67ded6a4faae29edff8e4f7886978e71ce116e33
commit: 67ded6a4faae29edff8e4f7886978e71ce116e33
branch: main
author: h-vetinari <[email protected]>
committer: Fidget-Spinner <[email protected]>
date: 2025-04-09T22:50:38+08:00
summary:
update comment about LLVM bug relevant for `--with-tail-call-interp`
performance (#132297)
files:
M Doc/whatsnew/3.14.rst
diff --git a/Doc/whatsnew/3.14.rst b/Doc/whatsnew/3.14.rst
index 5f84d8ba8b02c2..0f15a2a8a8f6af 100644
--- a/Doc/whatsnew/3.14.rst
+++ b/Doc/whatsnew/3.14.rst
@@ -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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