https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90453
--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> --- 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.
