[PATCH] [DAGCombiner] Add support for TRUNCATE + FP_EXTEND vector constant folding

[Simon Pilgrim]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8593

Files:
  llvm/trunk/include/llvm/CodeGen/SelectionDAGNodes.h
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/trunk/test/CodeGen/X86/vec_fpext.ll
  llvm/trunk/test/CodeGen/X86/vector-trunc.ll

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