[llvm-dev] Way to know if an Operand of a SelectionDAG is a pointer

[Krzysztof Parzyszek via llvm-dev]

You cannot detect that by simply looking at the DAG. The way such things 
are usually done is that you invent your own SDNode that represents the 
property that you want to examine later. In your case it could be 
something like YourTargetISD::SMALL_SCRATCH_POINTER, which would take 
one value and return one value. This node would not cause any code to be 
generated for it, it would only serve as a "label" indicating that its 
operand is special in some way.

-Krzysztof

On 5/4/2018 1:03 AM, Alexandre Ghiti via llvm-dev wrote:
> Hi everyone,
> 
> We developed a new backend for our architecture based on LLVM 3.8, I'm 
> sorry about that, I quite understand if my questions do not get any 
> answers because of that.
> 
> We have some instructions that allow to protect pointers that sit in our 
> small scratch-area.
> 
> I did not find a way to know, when selecting the machine instructions, 
> if one of the operands of the SDNode is a pointer. Do you know how I 
> could get this info ?
> 
> Thanks for your time,
> 
> Alex
> 
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