[PATCH][AVX512] Handle unsigned v4i32->v4f64 convert

[Demikhovsky, Elena]

Usually, when I add such operation in td file, I have to specify that this operation becomes legal in X86ISelLowering.cpp. 
Could you, please, check?
And what happens on AVX2? Should you say that the replacement is available on AVX-512 only.

The code itself is ok, and if you have answers on questions above, you can commit.

-  Elena


-----Original Message-----
From: Cameron McInally [mailto:cameron.mcinally at nyu.edu] 
Sent: Wednesday, June 18, 2014 04:30
To: llvm-commits at cs.uiuc.edu
Cc: Demikhovsky, Elena
Subject: [PATCH][AVX512] Handle unsigned v4i32->v4f64 convert

Hey guys,

Here is a pattern to convert 4 packed unsigned doubleword integers to
4 packed doubles using the AVX512 VCVTUDQ2PD instruction.

Tia,
Cameron
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