[PATCH] D18550: AMDGPU/SI: Add peephole optimzer pass

[Tom Stellard via llvm-commits]

tstellarAMD created this revision.
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All this pass does for now is combine consecutive s_nop instructions,
which will be necessary once the hazard recognizer is enabled.

http://reviews.llvm.org/D18550

Files:
  lib/Target/AMDGPU/AMDGPU.h
  lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
  lib/Target/AMDGPU/CMakeLists.txt
  lib/Target/AMDGPU/GCNPeepholeOptimizer.cpp

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