[PATCH] D58512: AMDGPU/GlobalISel: Insert waterfall loop for vector indexing

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: tstellar, scott.linder, rampitec, qcolombet.
Herald added subscribers: jdoerfert, Petar.Avramovic, arphaman, t-tye, tpr, dstuttard, kristof.beyls, rovka, yaxunl, nhaehnle, wdng, jvesely, kzhuravl.

The register index can only really be an SGPR. Lie that a VGPR index
is legal, and then rewrite the instruction in a waterfall loop to
handle the index.


https://reviews.llvm.org/D58512

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

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