[PATCH] D140546: [AMDGPU] Remove permlane discard vdst_in optimization from isel

[Jay Foad via Phabricator via llvm-commits]

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D72845 <https://reviews.llvm.org/D72845> implemented the equivalent IR optimization in InstCombine so it
seems that there's no advantage to doing it during isel too.

This partially reverts D72844 <https://reviews.llvm.org/D72844>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D140546

Files:
  llvm/lib/Target/AMDGPU/VOP3Instructions.td
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.permlane.ll

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