tree f39f8ac57777385a8d82be70c77cf35905c826eb
parent d4e1d2f77462f5844b8104d2d51e683f8ffcf6e7
author Simon Pilgrim <llvm-dev@redking.me.uk> 1547311136 +0000
committer Simon Pilgrim <llvm-dev@redking.me.uk> 1547311136 +0000

[X86] More aggressive shuffle mask widening in combineExtractWithShuffle

Use demanded extract index to set most of the shuffle mask to undef, making it easier to widen and peek through.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351013 91177308-0d34-0410-b5e6-96231b3b80d8