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This happens for a discriminated record type with default discriminants, for which GNAT allocates mutable objects with the maximum size, while trying not to copy padding bits unnecessarily. When the padded size is small enough to be copied efficiently, it should nevertheless be profitable to copy them in order to avoid a call to memcpy with a dynamic size. gcc/ada/ChangeLog: * gcc-interface/trans.cc (gnat_to_gnu): For the LHS of an assignment or an actual parameter of a call, do not remove the padding even for a type of self-referential size when the padded size is small enough to be copied efficiently.
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