[LLVMdev] Identify Loops from within FunctionPass, or possible to intermix different types of Passes?

[Devang Patel]

On Jan 6, 2011, at 9:21 AM, Chuck Zhao wrote:

> LLVMers,
> 
> I have a traversal plan which needs to visit certain types of Functions. For each instruction in such functions, I will need to know:
> 1. is it located inside a loop
> 2. if yes, what level of loop nest it is currently in.
> 
> So on the highest level, it should be a FunctionPass. However, in order to identify loops and loop-nest levels, it should also be a LoopPass.
> 
> Is there a reasonably simple way to identify loop(s) within a function under FunctionPass?
> 
> (Any existing LLVM code that I can take a look?)

Your FunctionPass can use LoopInfo to get this information.

-
Devang

> 
> OR
> 
> Is it possible to intermix different types of LLVM Passes?
> 
> E.g.
> 
> class MyPass: public FunctionPass, public LoopPass{
>   ...
> public:
>   bool runOnFunction(...);
>   bool runOnLoop(...);
>   ...
> };
> 
> Does this make any sense?
> I haven't seem to find any existing LLVM pass under such uses.
> 
> 
> Thank you very much
> 
> Chuck
> 
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