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ashm-dev
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iritkatriel and
markshannon
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October 21, 2026 23:27
iritkatriel
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Oct 21, 2026
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Move the five bit-fields immediately after
b_labelto use the existing alignment gap.On the tested x86-64 GCC build, this reduces
sizeof(_PyCfgBasicblock)from 72 to 64 bytes without changing the offsets of the other fields. No compiler behavior or public API changes are intended.Verified with
pahole. The following tests pass on a--with-pydebugbuild:test_compile,test_peepholer,test_dis,test_compiler_assemble,test_compiler_codegen,test_capi.test_opt,test_exception_variations, andtest_syntax.Closes #160132.
_PyCfgBasicblock#160132