[PATCH] D69280: [AMDGPU] Allow folding of sgpr to vgpr copy

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

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

Potentially sgpr to sgpr copy should also be possible.
That is however trickier because we may end up with a
wrong register class at use because of xm0/xexec permutations.


https://reviews.llvm.org/D69280

Files:
  llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
  llvm/test/CodeGen/AMDGPU/fmul-2-combine-multi-use.ll
  llvm/test/CodeGen/AMDGPU/fold-vgpr-copy.mir
  llvm/test/CodeGen/AMDGPU/saddo.ll

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