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_GUARD_TOS_ANY_SET missing sym_set_type after NOP optimization #145214

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_GUARD_TOS_ANY_SET missing sym_set_type after NOP optimization#145214
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corona10
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interpreter-core(Objects, Python, Grammar, and Parser dirs)topic-JITtype-bugAn unexpected behavior, bug, or error
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corona10
opened on Feb 25, 2026

cpython/Python/optimizer_bytecodes.c

Lines 1374 to 1380 in 9b22261

op(_GUARD_TOS_ANY_SET, (tos -- tos)) {
if (sym_matches_type(tos, &PySet_Type) ||
sym_matches_type(tos, &PyFrozenSet_Type))
{
ADD_OP(_NOP, 0, 0);
}
}

The optimizer should narrow the symbolic type so that
subsequent instructions can benefit from the known type. The fix would be to add
sym_set_type(tos, tp) consistent with _GUARD_TOS_ANY_DICT.

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interpreter-core(Objects, Python, Grammar, and Parser dirs)topic-JITtype-bugAn unexpected behavior, bug, or error

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