--- Comment #3 from Segher Boessenkool <segher at gcc dot> ---
What should the semantics of this be?  There are four 32-bit elts each
in packedl and packedr, which of those go where in unpacked?

I think what you want to do can be expressed with just two or maybe three
existing builtins, but it's not clear to me exactly what you want.

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