[PATCH] D72575: [x86] try harder to form 256-bit unpck*

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon accepted this revision.
RKSimon added a comment.
This revision is now accepted and ready to land.

LGTM - technically this is a limited version of a "lowerShuffleAsLanePermuteAndUNPCK" pattern that we might want to investigate in the future, but its a more controllable initial implementation.


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https://reviews.llvm.org/D72575