[PATCH] [X86][SSE] Improve support for 128-bit vector sign extension

[Simon Pilgrim]

Thanks Elena - I've relaxed the types test to just check the input/output scalar types are the correct sizes. Notably we have i1 types coming through that this code shouldn't attempt to deal with.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9848

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/pr15267.ll
  test/CodeGen/X86/vec_cast2.ll
  test/CodeGen/X86/vector-sext.ll
  test/CodeGen/X86/vselect-avx.ll

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