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

[Zia Ansari via Phabricator via llvm-commits]

zansari added a comment.

Thanks for the link, Sanjay. Yes, I was just about to comment on this in the other review as i just got confirmation.. The info in that link is right. The h/w shufflers cross both domains after IVB, therefore, not suffering the bypass penalty when switching through such instructions (perm/shuf/unpack...).


https://reviews.llvm.org/D27692