GH-131729: Code-gen better liveness analysis#131732
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markshannon merged 12 commits intopython:mainfrom Mar 26, 2025
Merged
GH-131729: Code-gen better liveness analysis#131732markshannon merged 12 commits intopython:mainfrom
markshannon merged 12 commits intopython:mainfrom
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iritkatriel
approved these changes
Mar 26, 2025
| stack_pointer = _PyFrame_GetStackPointer(frame); | ||
| stack_pointer[-1] = b; | ||
| } | ||
| stack_pointer[-1] = b; |
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@markshannon, this change seems incorrect. b is never written to the stack if we take the first conditional (where value is None and b is True). I suspect there might be other places where reasoning about both arms of a conditional is broken in a similar way.
diegorusso
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Apr 1, 2025
* Rename 'defined' attribute to 'in_local' to more accurately reflect how it is used * Make death of variables explicit even for array variables. * Convert in_memory from boolean to stack offset * Don't apply liveness analysis to optimizer generated code * Fix RETURN_VALUE in optimizer
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Also fixes #131695
This PR improves the liveness analysis of the code generator, reducing the number of redundant stores and giving more precise errors.