llvm dev - Mar 2015 - [LLVMdev] LLVM pass adding function call specific to Linux, middle-end or backend?

Hi everyone, 

I have already developped some optimizer pass in the middle-end playing
with the LLVM IR. 

Now, I would like to write a pass that are going to add some functions
calls that exist only on Linux system (both x86 and x64). I was
wondering about the right way to do it. Does LLVM offer any way to
obtain the current architecture in the middle-end (analysis pass maybe)?
If so, should I write this pass in the middle-end using the flexibility
of LLVM IR to add function call and some if/else branch to avoid
transformation on unsupported OS? Or should I write my pass somewhere
(where?) in the backend's specific part for Linux x86/x64 architecture? 

Thank you for your help. 

Gael 
 
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