[PATCH] [X86][SSE] Added support for SSE3 lane duplication shuffle instructions

[Chandler Carruth]

This looks really good with only a minor ordering issue between movddup and broadcast which I commented on below.


REPOSITORY
  rL LLVM

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Comment at: test/CodeGen/X86/vector-shuffle-512-v8.ll:633
@@ -632,3 +632,3 @@
 ; ALL:       # BB#0:
-; ALL-NEXT:    vbroadcastsd %xmm0, %ymm1
 ; ALL-NEXT:    vextractf64x4 $1, %zmm0, %ymm0 
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I would expect vbroadcast to be generally a better choice than vmovddup here..

http://reviews.llvm.org/D7042

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