[llvm] r221313 - [X86][SSE] Enable commutation for SSE immediate blend instructions

[Chandler Carruth]

On Tue, Nov 4, 2014 at 5:25 PM, Simon Pilgrim <llvm-dev at redking.me.uk>
wrote:

> [X86][SSE] Enable commutation for SSE immediate blend instructions
>
> Patch to allow (v)blendps, (v)blendpd, (v)pblendw and vpblendd
> instructions to be commuted - swaps the src registers and inverts the blend
> mask.
>
> This is primarily to improve memory folding (see new tests), but it also
> improves the quality of shuffles (see modified tests).
>

Fantastic, and thank you for seeing this part through!
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