[PATCH] D88420: [InstCombine] matchRotate - support non-uniform constant vector rotation amounts (PR46895)

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

> To handle the various undef cases this ended up being a lot bulkier than I hoped - I'd love to hear if anyone has any suggestions on how we could use ConstantExpr/PatternMatch to simplify this as I imagine we could use such functionality in other places as we improve non-uniform vector support.

Would something along the lines of `ConstantExpr::getAdd(LC, RC)` and then matching the result against a Width splat work?


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