[PATCH] D18870: AMDGPU/SI: Use the hazard recognizer to break SMEM soft clauses

[Tom Stellard via llvm-commits]

tstellarAMD created this revision.
tstellarAMD added a reviewer: arsenm.
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Add support for detecting hazards in SMEM soft clauses, so that we only
break the clauses when necessary, either by adding s_nop or re-ordering
other alu instructions.

http://reviews.llvm.org/D18870

Files:
  lib/Target/AMDGPU/GCNHazardRecognizer.cpp
  lib/Target/AMDGPU/GCNHazardRecognizer.h
  lib/Target/AMDGPU/SIInsertWaits.cpp

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