--- Comment #11 from Eric Botcazou <ebotcazou at gcc dot> ---
> So are the upper bits for SPARC completely undefined? That would then be the
> major distinction between MIPS and SPARC. The upper bits are defined for MIPS

On the contrary, they are always defined since instructions always operate on
the full 64-bit registers, but they don't matter for 32-bit operations, i.e.
32-bit operations would work the same if they were garbage.

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