[PATCH] D32785: [KnownBits] Add methods for determining if KnownBits is a constant value

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

> Unfortunately SimplifyDemandedBits needs to check if DemandedMask is a subset of the known bits so we can't use isConstant there. Maybe we need to add a method like areDemandedBitsConstant?

Would this be a KnowBits method or just a static helper wrapper inside InstCombineSimplifyDemanded.cpp ?



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Comment at: lib/Analysis/ConstantFolding.cpp:708
+      return ConstantInt::get(Op0->getType(), Known0.getConstant());
     }
   }
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https://reviews.llvm.org/D32785