[all-commits] [llvm/llvm-project] 2d338b: [CodeGen] Refactor DeadMIElim isDead and GISel isT...

[Tobias Stadler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2d338bed00b2bba713bceb4915400063b95929b2
      https://github.com/llvm/llvm-project/commit/2d338bed00b2bba713bceb4915400063b95929b2
  Author: Tobias Stadler <mail at stadler-tobias.de>
  Date:   2024-09-09 (Mon, 09 Sep 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/MachineInstr.h
    M llvm/lib/CodeGen/DeadMachineInstructionElim.cpp
    M llvm/lib/CodeGen/GlobalISel/Utils.cpp
    M llvm/lib/CodeGen/MachineInstr.cpp

  Log Message:
  -----------
  [CodeGen] Refactor DeadMIElim isDead and GISel isTriviallyDead (#105956)

Merge GlobalISel's isTriviallyDead and DeadMachineInstructionElim's
isDead code and remove all unnecessary checks from the hot path by
looping over the operands before doing any other checks.

See #105950 for why DeadMIElim needs to remove LIFETIME markers even
though they probably shouldn't generally be considered dead.

x86 CTMark O3: -0.1%
AArch64 GlobalISel CTMark O0: -0.6%, O2: -0.2%



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