[PATCH] [X86, AVX] use blends instead of insert128 with index 0

[Sanjay Patel]

Updated patch: the previous version of the patch was adding logic to PerformShuffleCombine256(), but that won't catch every case where we create an INSERT_SUBVECTOR. And yes, there was one more shuffle regression test where we expected an inserti128 $0

In this version, I've moved the code into Insert128BitVector(). No other functional changes.

This should catch every creation of an INSERT_SUBVECTOR that can be optimized with a BLENDI.


http://reviews.llvm.org/D8366

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/2012-04-26-sdglue.ll
  test/CodeGen/X86/avx-cast.ll
  test/CodeGen/X86/vector-shuffle-256-v32.ll

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