[all-commits] [llvm/llvm-project] b51c61: Use PoisonValue instead of UndefValue when RAUWing...

[ManuelJBrito via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b51c6130efac2afd183ad71b81c16c713c10a1b5
      https://github.com/llvm/llvm-project/commit/b51c6130efac2afd183ad71b81c16c713c10a1b5
  Author: Manuel Brito <manuel.brito at tecnico.ulisboa.pt>
  Date:   2022-09-10 (Sat, 10 Sep 2022)

  Changed paths:
    M llvm/lib/CodeGen/WinEHPrepare.cpp
    M llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
    M llvm/lib/Transforms/Utils/CallGraphUpdater.cpp
    M llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
    M llvm/tools/bugpoint/CrashDebugger.cpp

  Log Message:
  -----------
  Use PoisonValue instead of UndefValue when RAUWing unreachable code [NFC]

Replacing the following instances of UndefValue with PoisonValue, where the UndefValue is used as an arbitrary value:

- llvm/lib/CodeGen/WinEHPrepare.cpp
`demotePHIsOnFunclets`: RAUW arbitrary value for lingering uses of removed PHI nodes

 - llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
`FoldSingleEntryPHINodes`: Removes a self-referential single entry phi node.

 - llvm/lib/Transforms/Utils/CallGraphUpdater.cpp
`finalize`: Remove all references to removed functions.

- llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
`cleanup`: the result is not used then the inserted instructions are removed.

 - llvm/tools/bugpoint/CrashDebugger.cpp
`TestInts`:  the program is cloned and instructions are removed to narrow down source of crash.

Differential Revision: https://reviews.llvm.org/D133640