gh-128563: Add correction note to tail call in whats new #130908
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bedevere-app
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Merging ASAP so we don't further unintentionally mislead anyone. |
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@nelhage fyi i gave you credit for finding this as well in the whats new, please check it out :)! |
mdboom
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Mar 6, 2025
| @@ -295,6 +295,19 @@ For further information on how to build Python, see | |||
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| __ https://en.wikipedia.org/wiki/Tail_call | |||
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| .. attention:: | |||
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| This section previously reported a 9-15% geomean speedup. This number has since been | |||
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Can we say "geometric mean" here? I think geomean is too jargonny.
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🤦 thanks, but I automerged too quickly.
mdboom
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Mar 6, 2025
| cautiously revised down to 3-5%. While we expect performance results to be better | ||
| than what we report, our estimates are more conservative due to a | ||
| `compiler bug <https://github.com/llvm/llvm-project/issues/106846>`_ found in | ||
| Clang/LLVM 19. We were unaware of this bug, and it artifically boosted |
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Instead of saying "artificially boosted our numbers" (which seems to imply it magically made tail calling even better), maybe say "which negatively impacted the performance of the traditional non-tail calling interpreter loop"
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Yeah Stefan Marr pointed out that the artificially boosting comment makes no sense too. So I addressed that here #130911
seehwan
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Apr 16, 2025
…n#130908) * Add correction note to tail call in whats new * Update 3.14.rst
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@nelhage
📚 Documentation preview 📚: https://cpython-previews--130908.org.readthedocs.build/