[all-commits] [llvm/llvm-project] 4bc359: [MachinePipeliner] Fix use-after-free coping value...

[Vitaly Buka via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4bc3592bd2cb5fae6dfb5b3958727bae4115a800
      https://github.com/llvm/llvm-project/commit/4bc3592bd2cb5fae6dfb5b3958727bae4115a800
  Author: Vitaly Buka <vitalybuka at google.com>
  Date:   2025-03-07 (Fri, 07 Mar 2025)

  Changed paths:
    M llvm/lib/CodeGen/ModuloSchedule.cpp

  Log Message:
  -----------
  [MachinePipeliner] Fix use-after-free coping values of the same DenseMap (#130311)

After #130165.

In the code: `VRMap[CurStageNum][Def] = VRMap[CurStageNum][LoopVal]`
`VRMap[CurStageNum][LoopVal]` calculates a reference before
`VRMap[CurStageNum][Def]` which may rehash the DenseMap.
Then the reference can be dead.



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