mkuper added a comment.

Could you point me to where in the documentation it says they must be 
zero-extended?
The Intel intrinsics guide actually has them with shorter return types:

  __int8 _mm256_extract_epi8 (__m256i a, const int index)
  __int16 _mm256_extract_epi16 (__m256i a, const int index)


Repository:
  rL LLVM

http://reviews.llvm.org/D20468



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