gh-124153: Implement PyType_GetBaseByToken() and Py_tp_token slot
#124163
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neonene
requested review from
a team,
encukou and
markshannon
as code owners
6 tasks
|
I'll check this and PoC version again. |
encukou
approved these changes
Sep 17, 2024
neonene
commented
Sep 17, 2024
Objects/typeobject.c
Outdated
| return -1; | ||
| } | ||
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| if (!_PyType_HasFeature(type, Py_TPFLAGS_HEAPTYPE)) { |
There was a problem hiding this comment.
When I observed a good performance, the line had a typo (missing a NOT), though check_base_by_token() was unused during a PGO test. The telco got slower by 5-10% once I corrected, which was actually fixed by one of the following:
-
Use
if-elsestatement -
Replace
_PyType_HasFeature()with the publicPyType_HasFeature(), not with ineffective(type->tp_flags & Py_TPFLAGS_HEAPTYPE)
They are not used in PyType_GetBaseByToken().
This chains the branches in PyType_GetBaseByToken() as well, which is effective when MSVC is in better condition on PGO.
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I think I've finished. When checking a type without a result, this may be a bit slower than the draft PR, not trained well for now. |
savannahostrowski
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to savannahostrowski/cpython
that referenced
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Sep 22, 2024
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PyType_GetBaseByTokenfunction withPy_tp_tokenslot #124153📚 Documentation preview 📚: https://cpython-previews--124163.org.readthedocs.build/