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Commit fc2c9af9 authored by Simon Pilgrim's avatar Simon Pilgrim
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[TargetLowering] Add UNDEF folding to SimplifyDemandedVectorElts 

If all the demanded elements of the SimplifyDemandedVectorElts are known to be UNDEF, we can simplify to an ISD::UNDEF node.

Zero constant folding will be handled in a future patch - its a little trickier as we often have bitcasted zero values.

Differential Revision: https://reviews.llvm.org/D55511

llvm-svn: 348784
parent 17e53b92
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