It represents a variable, an assignment to that variable, and the expression 
that produces the value being assigned. 

Go read about SSA and data flow graphs (DFG's) if you need to know more. 

-Filip

> On Apr 30, 2014, at 1:36 AM, Gergo Balogh 
> <[email protected]> wrote:
> 
> hello,
> 
>  
> 
> I am trying to understand the purpose and role of each DFG node. During this 
> quest I could not find any detailed description for these. Please if anybody 
> has access to any kind of related matterial send it to me or let me know 
> where can I find it.
> 
>  
> 
> Thank you in advance:
> 
> Gergo
> 
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