[PATCH] D58503: [SelectionDAG] Add demanded elts variants to isConstSplat helpers. NFCI.

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, spatel, niravd, efriedma.
Herald added a subscriber: jdoerfert.
Herald added a project: LLVM.

These helpers extend the existing isConstOrConstSplat helper checks to support DemandedElts masks as well.

We already had a local version of this in SelectionDAG that computeKnownBits/ComputeNumSignBits made use of, but this adds the functionality directly to the BuildVectorSDNode node and extends the isConstOrConstSplat to use that.

This will allow us to reuse the functionality in SimplifyDemandedVectorElts/SimplifyDemandedBits.


Repository:
  rL LLVM

https://reviews.llvm.org/D58503

Files:
  include/llvm/CodeGen/SelectionDAGNodes.h
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp

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