[LLVMdev] LiveValues removal

[Carlo Alberto Ferraris]

Il 31/03/2011 18:50, Andrew Clinton ha scritto:
> LiveVariables is the optimized and tested way to get variable liveness 
> information (it's used by register allocation).  Unfortunately it 
> requires a MachineFunction to work - so you'll either need to lower to 
> one of the built-in targets or add your own target to acquire access 
> to this pass.
>
> Andrew
>
I just realized that I actually need something looser than LiveValues. I 
just need to know, at the begining of a BB, the list of values defined 
in the predecessor(s). If there are multiple predecessors it's easy (I 
just iterate over the PHIs and get all I need to know there), but I'm 
kind of stuck on how to do it when there's a single predecessor, i.e. 
there are no PHIs.
How is this problem dealt with internally by LLVM?


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