efriedma added a comment. Do we really need a dedicated LLVM intrinsic to make the pattern-matching work here? It would be better if we could leverage @llvm.experimental.vector.insert.nxv16i8.v16i8 or something like that. Something along the lines of https://godbolt.org/z/Wz4azzKrP seems straightforward enough to match, and generates decent code even without any special patterns.
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