[LLVMdev] Pass to compute livein info

[Jakob Stoklund Olesen]

On Jan 6, 2011, at 8:16 AM, Bin Zeng wrote:

> Hi all,
> 
> Is there a pass that computes livein information for each 
> MachineBasicBlock? I tried to find such a pass but could not find any. I 
> am trying to use the livein information to get dead registers to insert 
> some instructions right before code emission but the livein information 
> seems to be invalidated by some pass. I might need to recompute the 
> livein information before my pass. Thanks a lot.

No, the liveness is not preserved by late code generation passes, and there is currently no way of recomputing it.

/jakob

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