commit 33468275adcd812124ac451a3630efc74f09698e
author Simon Pilgrim <llvm-dev@redking.me.uk> Thu Jul 12 13:29:41 2018 +0000
committer Simon Pilgrim <llvm-dev@redking.me.uk> Thu Jul 12 13:29:41 2018 +0000
tree 8b2ffb9608ed641d679932023e61ad3b7d77ef28
parent 36dba4ab0ce774a5180e9a35e8a42132aa06d088

[X86][SSE] Utilize ZeroableElements for canWidenShuffleElements

canWidenShuffleElements can do a better job if given a mask with ZeroableElements info. Apparently, ZeroableElements was being only used to identify AllZero candidates, but possibly we could plug it into more shuffle matchers.

Original Patch by Zvi Rackover @zvi

Differential Revision: https://reviews.llvm.org/D42044

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336903 91177308-0d34-0410-b5e6-96231b3b80d8