[LLVMdev] MachineFunction Cloning

Evan Cheng evan.cheng at apple.com
Wed Mar 12 15:15:22 PDT 2008

On Mar 12, 2008, at 1:56 PM, David Greene wrote:

> Is there a utility somewhere to clone a MachineFunction?  I'd like  
> to do a
> bunch of complicated transformations and then throw away the results  
> and
> restore the initial state if I decide it's not good.

There is a MachineInstr::clone(), but not a MachineFunction::clone().  
It's not clear to me whether it is difficult to add.

> Are there methods to save and restore dataflow information in the  
> same way?
> I'm particularly interested in live interval information.

There is a LiveInterval::Copy(), but that's about it. I think live  
interval information should be relatively easy to copy though.


>                                           -Dave
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