[PATCH] AVX512: shuff62x2 DAG lowering

[Igor Breger]

Hi delena, chandlerc,

Implemented  DAG lowering for shuff62x2/shufi62x2 instuctions ( Shuffle Packed Values at 128-bit Granularity ) 
Tests added , vector-shuffle-512-v8.ll test re-generated.

example
  shufflevector <8 x double> %x, <8 x double> %x1, <8 x i32> <i32 0, i32 1, i32 4, i32 5, i32 0, i32 1,  i32 4, i32 5>

Before optimization the follow instruction was generated:
        vmovdqa64	LCPI0_0(%rip), %zmm1
	vpermpd	%zmm0, %zmm1, %zmm0
After optimization:
         vshuff64x2 $136, %zmm0, %zmm0, %zmm0

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10300

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx512-shuffle.ll
  test/CodeGen/X86/vector-shuffle-512-v8.ll

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/
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