[PATCH] D68628: GlobalISel: Implement lower for G_SADDO/G_SSUBO

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: aemerson, aditya_nandakumar, paquette, dsanders.
Herald added subscribers: Petar.Avramovic, volkan, rovka, nhaehnle, wdng, jvesely.

Port directly from SelectionDAG, minus the path using
ISD::SADDSAT/ISD::SSUBSAT.


https://reviews.llvm.org/D68628

Files:
  include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
  lib/CodeGen/GlobalISel/LegalizerHelper.cpp
  lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
  lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
  test/CodeGen/AMDGPU/GlobalISel/legalize-saddo.mir
  test/CodeGen/AMDGPU/GlobalISel/legalize-ssubo.mir
  test/CodeGen/AMDGPU/GlobalISel/regbankselect-saddo.mir
  test/CodeGen/AMDGPU/GlobalISel/regbankselect-ssubo.mir

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