Tobias Stadler 2d338bed00 [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%

2024-09-09 16:30:44 +02:00

5.4 KiB

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