[PATCH] D49499: [X86] Prefer unpckhpd over movhlps in isel for fake unary cases

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

All of this does make we wonder if we should be trying to make domain-switching, commutation/folding and reg-alloc all work more closely together.


https://reviews.llvm.org/D49499