[PATCH] D14399: [X86][SSE] Combine UNPCKL with vector_shuffle into UNPCKH to save one instruction for sext from v16i8 to v16i16 and v8i16 to v8i32.

[Cong Hou via llvm-commits]

congh updated this revision to Diff 39563.
congh added a comment.

Update the patch according to Simon's comment by checking 128-bit vectors.


http://reviews.llvm.org/D14399

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vec_int_to_fp.ll
  test/CodeGen/X86/vector-sext.ll

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