[PATCH] D20994: AMDGPU: Fix i64 global cmpxchg

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: tstellarAMD.
arsenm added a subscriber: llvm-commits.
Herald added subscribers: kzhuravl, arsenm.

This was using extract_subreg sub0 to extract the low register
of the result instead of sub0_sub1, producing an invalid copy.
    
There doesn't seem to be a way to use the compound subreg indices
in tablegen since those are generated, so manually select it.


http://reviews.llvm.org/D20994

Files:
  lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
  lib/Target/AMDGPU/AMDGPUSubtarget.h
  lib/Target/AMDGPU/SIISelLowering.cpp
  lib/Target/AMDGPU/SIInstructions.td
  test/CodeGen/AMDGPU/global_atomics.ll
  test/CodeGen/AMDGPU/global_atomics_i64.ll

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