tree bc578306ba98c3edf662fc08dd97722ab4f95e73
parent 618693a06bf3a0d4d3d7e6c22798a69329c01db9
author Simon Pilgrim <llvm-dev@redking.me.uk> 1549818240 +0000
committer Simon Pilgrim <llvm-dev@redking.me.uk> 1549818240 +0000

[DAGCombine] Simplify funnel shifts with undef/zero args to bitshifts

Now that we have SimplifyDemandedBits support for funnel shifts (rL353539), we need to simplify funnel shifts back to bitshifts in cases where either argument has been folded to undef/zero.

Differential Revision: https://reviews.llvm.org/D58009

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353645 91177308-0d34-0410-b5e6-96231b3b80d8