[PATCH] D57066: [TargetLowering] try harder to determine undef elements of vector binops

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: lib/CodeGen/SelectionDAG/TargetLowering.cpp:1872
   }
   case ISD::AND: {
     APInt SrcUndef, SrcZero;
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(off topic) Can ISD::MUL be supported here?


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Comment at: lib/CodeGen/SelectionDAG/TargetLowering.cpp:1885
     KnownUndef &= SrcUndef;
     KnownUndef &= ~KnownZero;
     break;
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Do we need to add getKnownUndefForVectorBinop support here?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D57066/new/

https://reviews.llvm.org/D57066