llvm dev - Mar 2009 - [LLVMdev] Register Liveness

I was wonderring if there is any quick way to check how many virtual registers
are live-in at any give instruction of a function?

 

Right now my understanding is that I would have to calculate the gen, kill, in
and out sets and iterate over the entire functions CFG until the sets stop
changing.

 

Thanks

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There has been talk about lazily computing liveness. Please search the  
llvmdev archive.

Evan

On Mar 19, 2009, at 9:28 AM, George Patsilaras wrote:
> I was wonderring if there is any quick way to check how many virtual  
> registers are live-in at any give instruction of a function?
>
> Right now my understanding is that I would have to calculate the  
> gen, kill, in and out sets and iterate over the entire functions CFG  
> until the sets stop changing.
>
> Thanks
>
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