[PATCH] Break dependencies in large loops containing reductions (LoopVectorize)

[Olivier Sallenave]

This patch unrolls large loops containing reductions. The cost function discussed here was implemented. Added enableAggressiveFMAFusion to TTI to fine-tune the heuristics.


http://reviews.llvm.org/D7514

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Analysis/TargetTransformInfoImpl.h
  include/llvm/CodeGen/BasicTTIImpl.h
  include/llvm/Target/TargetLowering.h
  lib/Analysis/TargetTransformInfo.cpp
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/NVPTX/NVPTXISelLowering.h
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.h
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/PowerPC/large-loop-rdx.ll

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