[PATCH] D27692: [x86] use a single shufps when it can save instructions

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

There's a summary of Agner's findings on this here:
https://llvm.org/bugs/show_bug.cgi?id=27885#c3
...it seems the cross-domain bubble does not actually exist in a lot of common cases (or it's hard to measure).


https://reviews.llvm.org/D27692