[PATCH] D104250: [TLI] SimplifyDemandedVectorElts(): handle SCALAR_TO_VECTOR(EXTRACT_VECTOR_ELT(?, 0))

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

Thanks for looking into this!



================
Comment at: llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp:2437
+      auto *CIdx = dyn_cast<ConstantSDNode>(Idx);
+      if (CIdx && CIdx->isNullValue()) {
+        APInt SrcDemandedElts = APInt::getOneBitSet(NumSrcElts, 0);
----------------
isNullConstant ?


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  https://reviews.llvm.org/D104250/new/

https://reviews.llvm.org/D104250