[PATCH] [X86][SSE] Vectorize v2i32 to v2f64 conversions

[Simon Pilgrim]

Hi qcolombet, delena, andreadb, spatel,

This patch enables support for the conversion of v2i32 to v2f64 to use the CVTDQ2PD xmm instruction and stay on the SSE unit instead of scalarizing, sign extending to i64 and using CVTSI2SDQ scalar conversions.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10433

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  lib/Target/X86/X86InstrFragmentsSIMD.td
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/vec_int_to_fp.ll
  test/CodeGen/X86/x86-setcc-int-to-fp-combine.ll

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