[PATCH] D89187: [AMDGPU] Minimize number of s_mov generated by copyPhysReg

[Carl Ritson via Phabricator via llvm-commits]

critson created this revision.
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Generate the minimal set of s_mov instructions required when
expanding a SGPR copy operation in copyPhysReg. Additionally
add a peephole to avoid generating s_mov instructions for
registers which will immediately be overwritten.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D89187

Files:
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/lib/Target/AMDGPU/opt-sgpr-phys-copy.mir

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