[PATCH] D58511: AMDGPU: Don't look for constant in insert/extract_vector_elt regbankselect

[Matt Arsenault via Phabricator via llvm-commits]

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

The constantness shouldn't change the register bank choice. We also
don't need to restrict this to only indexing VGPRs, since it's
possible to index SGPRs (but SelectionDAG made using this
difficult). Allow directly indexing SGPRs when appropriate.


https://reviews.llvm.org/D58511

Files:
  lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
  test/CodeGen/AMDGPU/GlobalISel/regbankselect-extract-vector-elt.mir
  test/CodeGen/AMDGPU/GlobalISel/regbankselect-insert-vector-elt.mir

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