[PATCH] D63225: AMDGPU: Fold readlane from copy of SGPR or imm

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: rampitec, nhaehnle.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, wdng, jvesely, kzhuravl.

These may be inserted to assert uniformity somewhere.


https://reviews.llvm.org/D63225

Files:
  lib/Target/AMDGPU/SIFoldOperands.cpp
  lib/Target/AMDGPU/SIInstructions.td
  test/CodeGen/AMDGPU/fold-imm-copy.mir
  test/CodeGen/AMDGPU/llvm.amdgcn.readfirstlane.ll
  test/CodeGen/AMDGPU/llvm.amdgcn.readlane.ll

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