gh-121459: Add missing return to _PyDict_LoadGlobalStackRef#124085
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We need to return immediately if there's an error during dictionary lookup. Also avoid the conditional-if operator. The Windows 10 buildbot seems to miscompile that for unknown reasons.
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colesbury commented Sep 14, 2024
!buildbot AMD64 Windows10 |
bedevere-bot commented Sep 14, 2024
🤖 New build scheduled with the buildbot fleet by @colesbury for commit c8c59a1 🤖 The command will test the builders whose names match following regular expression: The builders matched are:
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colesbury commented Sep 14, 2024
Comment on lines +1553 to +1558
| if (val==NULL){ | ||
| *value_addr=PyStackRef_NULL; | ||
| } | ||
| else{ | ||
| *value_addr=PyStackRef_FromPyObjectNew(val); | ||
| } |
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So... I think MSVC 1916 (Visual Studio 2017) on the Windows 10 buildbot is just really buggy and miscompiles the ternary if...
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Ugh, MSVC miscompiles this up through v19.27 (fixed in v19.28):
zware approved these changes Sep 14, 2024
savannahostrowski pushed a commit to savannahostrowski/cpython that referenced this pull request Sep 22, 2024
…thon#124085) We need to return immediately if there's an error during dictionary lookup. Also avoid the conditional-if operator. MSVC versions through v19.27 miscompile compound literals with side effects within a conditional operator. This caused crashes in the Windows10 buildbot.
colesbury commented Oct 21, 2024
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@fiona02 - Please do not post AI-generated PR reviews.
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We need to return immediately if there's an error during dictionary lookup.
Also avoid the conditional-if operator. The Windows 10 buildbot seems to miscompile that for unknown reasons.