[PATCH] D57478: GlobalISel: Implement fewerElementsVector for shifts

[Matt Arsenault via Phabricator via llvm-commits]

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

Introduce a new function which handles instructions with multiple type
indices, but have the same number of vector elements.

      

Also legalize v2s16 shifts when applicable.


https://reviews.llvm.org/D57478

Files:
  include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
  lib/CodeGen/GlobalISel/LegalizerHelper.cpp
  lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
  test/CodeGen/AMDGPU/GlobalISel/legalize-ashr.mir
  test/CodeGen/AMDGPU/GlobalISel/legalize-lshr.mir
  test/CodeGen/AMDGPU/GlobalISel/legalize-shl.mir

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