[PATCH] D124387: AMDGPU: Fold out readfirstlane between vgpr to vgpr copies

[Matt Arsenault via Phabricator via llvm-commits]

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

We were handling the SGPR->VGPR->SGPR case. This extends to handle
VGPR->SGPR->VGPR cases if exec wasn't modified between the use and
def. This cleans up a few cases used to assert uniformity if that
turned out to not be helpful.


https://reviews.llvm.org/D124387

Files:
  llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/atomic_optimizations_mul_one.ll
  llvm/test/CodeGen/AMDGPU/atomic_optimizations_buffer.ll
  llvm/test/CodeGen/AMDGPU/atomic_optimizations_global_pointer.ll
  llvm/test/CodeGen/AMDGPU/atomic_optimizations_local_pointer.ll
  llvm/test/CodeGen/AMDGPU/atomic_optimizations_pixelshader.ll
  llvm/test/CodeGen/AMDGPU/atomic_optimizations_raw_buffer.ll
  llvm/test/CodeGen/AMDGPU/atomic_optimizations_struct_buffer.ll
  llvm/test/CodeGen/AMDGPU/fold-readlane.mir
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.readfirstlane.ll
  llvm/test/CodeGen/AMDGPU/wave-id-computation.ll

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