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Commit 2072b5af authored by Simon Pilgrim's avatar Simon Pilgrim
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[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

llvm-svn: 349616
parent d4b07769
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