[LLVMdev] is there some canonical way to extend liveness?

[Philip Reames]

I'm assuming that you're asking this in the context of GC?  Are you 
doing conservative stack scanning?

One way you could address this would be to place a gc.statepoint 
immediately before the return with the value you need held live 
mentioned.  This would also give you a precise stackmap at that location 
(for the variables explicitly listed).

Philip

On 02/17/2015 12:46 PM, Andy Ayers wrote:
>
> In other compilers I’ve worked on there were special pseudo 
> instructions (or similar mechanisms like adding extra source operands 
> to returns) that allowed you to artificially extend lifetimes of 
> values. For instance we might have a requirement that a certain local 
> (say the ‘this pointer’) remain live throughout the method.
>
> Is there anything like this in LLVM?
>
>
>
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