Michael Liao 4b7ccfcaad Lower BUILD_VECTOR to SHUFFLE + INSERT_VECTOR_ELT for X86 ...

- If INSERT_VECTOR_ELT is supported (above SSE2, either by custom
  sequence of legal insn), transform BUILD_VECTOR into SHUFFLE +
  INSERT_VECTOR_ELT if most of elements could be built from SHUFFLE with few
  (so far 1) elements being inserted.

llvm-svn: 166288

2012-10-19 17:15:18 +00:00

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