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

Zia Ansari via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Tue Dec 13 11:24:49 PST 2016

zansari added a comment.

In https://reviews.llvm.org/D27692#621297, @RKSimon wrote:

> So does that mean both this and https://reviews.llvm.org/D27684 can be committed safely? For recent hardware it makes no difference (and https://reviews.llvm.org/D27684 possibly saves a few instruction bytes). For older hardware we still save cycles compared to performing the extra shuffles and we should fix up the domain switches where possible to help a little more.

I have no objections to this, or https://reviews.llvm.org/D27684.


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