[PATCH] D83637: [AMDGPU] Propagate dead flag during pre-RA exec mask optimizations

[Carl Ritson via Phabricator via llvm-commits]

critson created this revision.
critson added reviewers: rampitec, arsenm, nhaehnle.
Herald added subscribers: llvm-commits, kerbowa, hiraditya, t-tye, tpr, dstuttard, yaxunl, wdng, jvesely, kzhuravl.
Herald added a project: LLVM.

Preserve SCC dead flags in SIOptimizeExecMaskingPreRA.
This helps with removing redundant s_andn2 instructions later.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D83637

Files:
  llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
  llvm/test/CodeGen/AMDGPU/optimize-exec-masking-pre-ra.mir
  llvm/test/CodeGen/AMDGPU/optimize-negated-cond-exec-masking-wave32.mir
  llvm/test/CodeGen/AMDGPU/optimize-negated-cond-exec-masking.mir

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