commit de6808bcecbbb4cb4c8bebf8470b1c9cd4026158
author Simon Pilgrim <llvm-dev@redking.me.uk> Wed Dec 19 10:41:06 2018 +0000
committer Simon Pilgrim <llvm-dev@redking.me.uk> Wed Dec 19 10:41:06 2018 +0000
tree d3dd684f93796d0a3a8631da66f1f5337d07c565
parent 8468ad25af6e19c0f4a8dbc9168d41bb9edfe658

[SelectionDAG] Optional handling of UNDEF elements in matchUnaryPredicate

Now that SimplifyDemandedBits/SimplifyDemandedVectorElts are simplifying vector elements, we're seeing more constant BUILD_VECTOR containing UNDEFs.

This patch provides opt-in handling of UNDEF elements in matchUnaryPredicate, passing NULL instead of the ConstantSDNode* argument.

I've updated SelectionDAG::simplifyShift to demonstrate its use.

Differential Revision: https://reviews.llvm.org/D55819

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349616 91177308-0d34-0410-b5e6-96231b3b80d8