[PATCH] D74661: AMDGPU/GlobalISel: Insert readfirstlane on SGPR returns

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: nhaehnle, kerbowa, foad.
Herald added subscribers: hiraditya, t-tye, tpr, dstuttard, rovka, yaxunl, wdng, jvesely, kzhuravl.
Herald added a project: LLVM.

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.


https://reviews.llvm.org/D74661

Files:
  llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-amdgpu_ps.ll

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