[PATCH] D43349: [InstCombine] Make SimplifyDemandedUseBits handle PhiNode

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


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Comment at: lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp:681
+      SimplifyDemandedBits(I, i, DemandedMask, PhiOperandKnown, Depth + 1);
+      IKnownZero = IKnownZero & PhiOperandKnown.Zero;
+      IKnownOne = IKnownOne & PhiOperandKnown.One;
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Use "KnownZero &= PhiOperandKnown.Zero" it will save an allocation if the width is more than 64-bits.


https://reviews.llvm.org/D43349