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This is a useful property when doing further bit-twiddling with the magnitude array before/after calling extract_big_integer or make_big_integer. For example, constructing an emacs_limb_t object using repeated shift-and-add should work as expected, but relies on the type not having padding bits. Since the C standard already guarantees that unsigned integers use a pure binary representation, not having padding bits is enough to guarantee that the type has unique object representations in the sense of C++’s std::has_unique_object_representations. * doc/lispref/internals.texi (Module Values): Document that emacs_limb_t doesn’t have padding bits. * src/emacs-module.c: Verify that emacs_limb_t doesn’t have padding bits. |
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