[PATCH] D72166: AMDGPU/GlobalISel: Fold constant offset vector extract indexes

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: tstellar, nhaehnle, kerbowa.
Herald added subscribers: Petar.Avramovic, arphaman, hiraditya, t-tye, tpr, dstuttard, rovka, yaxunl, wdng, jvesely, kzhuravl.
Herald added a project: LLVM.
arsenm added parent revisions: D72126: AMDGPU/GlobalISel: Select G_EXTRACT_VECTOR_ELT, D72120: AMDGPU/GlobalISel: Fix G_EXTRACT_VECTOR_ELT mapping for s-v case, D72149: AMDGPU/GlobalISel: Add new utils file.

Handle dynamic vector extracts that use an index that's an add of a
constant offset into moving the base subregister of the indexing
operation.

Force the add into the loop in regbankselect, which will be recognized
when selected.


https://reviews.llvm.org/D72166

Files:
  llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
  llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/inst-select-extract-vector-elt.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-extract-vector-elt.mir

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