[all-commits] [llvm/llvm-project] 67cfbe: AMDGPU/GlobalISel: Insert readfirstlane on SGPR re...

[Matt Arsenault via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 67cfbec7461312ce6c1a8f38ad4f45b7886d51ef
      https://github.com/llvm/llvm-project/commit/67cfbec7461312ce6c1a8f38ad4f45b7886d51ef
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-03-10 (Tue, 10 Mar 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/bswap.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-amdgpu_ps.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-amdgpu_vs.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.s.buffer.load.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-amdgcn.s.buffer.load.ll

  Log Message:
  -----------
  AMDGPU/GlobalISel: Insert readfirstlane on SGPR returns

In case the source value ends up in a VGPR, insert a readfirstlane to
avoid producing an illegal copy later. If it turns out to be
unnecessary, it can be folded out.