[PATCH] D73197: [x86] match concat of 128-bit high half vectors before lowering to VPERM2X128

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

This looks OK, but I'd be curious if we'd hit more cases by adding a vperm2f128(insert_subvector,insert_subvector) combine in combineTargetShuffle instead.


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  https://reviews.llvm.org/D73197/new/

https://reviews.llvm.org/D73197