[LLVMdev] Register Liveness

George Patsilaras gpatsilaras at hotmail.com
Thu Mar 19 09:28:12 PDT 2009


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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