[PATCH] D127595: [DAG] visitINSERT_VECTOR_ELT - attempt to reconstruct BUILD_VECTOR before other fold interfere

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:19376
   // do this only if indices are both constants and Idx1 < Idx0.
   if (InVec.getOpcode() == ISD::INSERT_VECTOR_ELT && InVec.hasOneUse()
       && isa<ConstantSDNode>(InVec.getOperand(2))) {
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@deadalnix We canonicalize to ascending order here


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https://reviews.llvm.org/D127595