[PATCH] D94444: [RFC][Scalable] Add scalable shuffle intrinsic to extract evens from a pair of vectors

[Cameron McInally via Phabricator via llvm-commits]

cameron.mcinally added a comment.

Ok, I see where you are coming from now. LoopVectorize is keeping the shuffle result full by widening the the load+shuffle to double wide. LV's double wide choice seems like a weird one, but I suppose if that sequence is codegen'd correctly, then it will work out.

It will be interesting to see how this codegens when the input lives in registers. But again I suppose that ISelLowering could straighten it out if needed.


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