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Title: Better stats for `LOAD_ATTR` and `STORE_ATTR` by markshannon · Pull Request #100295 · python/cpython · GitHub

Open Graph Title: Better stats for `LOAD_ATTR` and `STORE_ATTR` by markshannon · Pull Request #100295 · python/cpython

X Title: Better stats for `LOAD_ATTR` and `STORE_ATTR` by markshannon · Pull Request #100295 · python/cpython

Description: This PR provides better stats for LOAD_ATTR and STORE_ATTR, differentiating several class attributes. There is a slight change to specializing behavior, but it seems to make no difference in practice. The main change is for simple attributes of a class. Consider class C: i = 0 c = C() c.i c.i is not specialized and the failure is reported as "not in dict". i isn't in the instance's dict, but that's not the problem. With this PR, the failure is reported as "class attr simple" which is much more informative. The change in specialization behavior is that if an instance attribute shadows a non-data descriptor, it is no longer specialized. This has no effect on the hit rate, which remains at 82%, but does convert some misses to deferreds.

Open Graph Description: This PR provides better stats for LOAD_ATTR and STORE_ATTR, differentiating several class attributes. There is a slight change to specializing behavior, but it seems to make no difference in pract...

X Description: This PR provides better stats for LOAD_ATTR and STORE_ATTR, differentiating several class attributes. There is a slight change to specializing behavior, but it seems to make no difference in pract...

Opengraph URL: https://github.com/python/cpython/pull/100295

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db9f04f Don't attempt to specialize for LOAD_ATTR on instance if class has at… markshannon Dec 16, 2022 https://github.com/python/cpython/pull/100295/commits/db9f04f17a7fa9ee794adb9e8ccdd4a24a8547b3
31ad53e Further improvement to LOAD_ATTR and STORE_ATTR specialization stats. markshannon Dec 16, 2022 https://github.com/python/cpython/pull/100295/commits/31ad53e700a5eee2ffa407199624a7f2afe49adf
05a9952 Refine stats for LOAD_ATTR with class attribute. markshannon Dec 16, 2022 https://github.com/python/cpython/pull/100295/commits/05a9952dfe7f89f862924f50f88541002a2b40ad
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