[PATCH] Use broadcasts to optimize overall size when loading constant splat vectors (x86-64 with AVX or AVX2)

[Sanjay Patel]

Hi Elena -

Thank you for the feedback. This function is already guarded against non-AVX CPUs. I've made that more explicit in the updated patch.

> You can take the broadcast to ymm as well.
> VBROADCASTSD ymm1,m64

This patch generates that - please see the testcases for expected output in both the AVX and AVX2 cases. Let me know if I missed something. I've tried to match the correct broadcast instruction with the vector element type in all cases, unless the ISA does not allow it.

http://reviews.llvm.org/D5347

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/splat-for-size.ll
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