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gh-140868: Don't rely on undefined left shift behavior in assert (#140869)

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Don't rely on undefined left shift behavior in assert
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Dino Viehland 2025-11-01 12:23:58 -04:00 • committed by GitHub
parent f701f98052
commit b1554146c2
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Include/internal/pycore_stackref.h
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@ -403,7 +403,8 @@ PyStackRef_IsTaggedInt(_PyStackRef i)
static inline _PyStackRef static inline _PyStackRef
PyStackRef_TagInt(intptr_t i) PyStackRef_TagInt(intptr_t i)
{ {
assert(Py_ARITHMETIC_RIGHT_SHIFT(intptr_t, (i << Py_TAGGED_SHIFT), Py_TAGGED_SHIFT) == i); assert(Py_ARITHMETIC_RIGHT_SHIFT(intptr_t, (intptr_t)(((uintptr_t)i) << Py_TAGGED_SHIFT),
Py_TAGGED_SHIFT) == i);
return (_PyStackRef){ .bits = ((((uintptr_t)i) << Py_TAGGED_SHIFT) | Py_INT_TAG) }; return (_PyStackRef){ .bits = ((((uintptr_t)i) << Py_TAGGED_SHIFT) | Py_INT_TAG) };
} }