[llvm] [InstCombine] Constant fold binops through `vector.insert` (PR #164624)

[Nikita Popov via llvm-commits]

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nikic wrote:

Can you please add a test where the inserted vector is non-splat? If I understand correctly, the transform is going to apply in that case as well.

https://github.com/llvm/llvm-project/pull/164624