[PATCH] D17102: AMDGPU/SI: Make sure MIMG descriptors and samplers stay in SGPRs

[Tom Stellard via llvm-commits]

tstellarAMD created this revision.
tstellarAMD added reviewers: arsenm, mareko.
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Herald added a subscriber: arsenm.

It's possible to have resource descriptors and samplers stored in
VGPRs, either by a VMEM instruction or in the case of samplers,
floating-point calculations.  When this happens, we need to use
v_readfirstlane to copy these values back to sgprs.

http://reviews.llvm.org/D17102

Files:
  lib/Target/AMDGPU/SIInstrFormats.td
  lib/Target/AMDGPU/SIInstrInfo.cpp
  lib/Target/AMDGPU/SIInstrInfo.h
  lib/Target/AMDGPU/SIRegisterInfo.cpp
  lib/Target/AMDGPU/SIRegisterInfo.h
  test/CodeGen/AMDGPU/sgpr-copy.ll
  test/CodeGen/AMDGPU/split-smrd.ll

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