[all-commits] [llvm/llvm-project] e00201: GlobalISel: Implement fewerElementsVector for G_EX...

[Matt Arsenault via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: e00201539f9c5c540a037add790eb31032aaea8f
      https://github.com/llvm/llvm-project/commit/e00201539f9c5c540a037add790eb31032aaea8f
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-08-06 (Thu, 06 Aug 2020)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
    M llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
    M llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
    A llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement-stack-lower.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-extract-vector-elt.mir

  Log Message:
  -----------
  GlobalISel: Implement fewerElementsVector for G_EXTRACT_VECTOR_ELT

Use the same basic strategy as LegalizeVectorTypes. Try to index into
smaller pieces if there's a constant index, and otherwise fall back to
a stack temporary.