[PATCH] D158171: [instcombine] Sunk instruction introduces unnecessary poison dbg.value

[Carlos Alberto Enciso via Phabricator via llvm-commits]

CarlosAlbertoEnciso created this revision.
CarlosAlbertoEnciso added reviewers: dblaikie, aprantl, probinson, jryans, chrisjackson.
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For the given test case, when the 'int Four = Two;' is sunk into the 'case 0:'
block, the debug value for 'Three' is set incorrectly to 'poison'.

  ...
  int Four = Two;
  switch (One) {
    case 0:
      Three = Four;
      break;
  ...


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158171

Files:
  llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
  llvm/test/Transforms/InstCombine/sink-instruction-introduces-unnecessary-poison-value.ll

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