llvm dev - Mar 2008 - [LLVMdev] Computing Register Pressure

Is there a convenient way to get the number of live intervals at any
program point?  Bonus if there's an easy way to iterate through all
of the live intervals at each program point.

Ideally I'd like to give some routine an instruction index and have 
it return an iterator to all live intervals at that point.

                                           -Dave

That's potentially very useful. But the current register allocator is  
not tracking this. This is something that can be computed at the  
beginning of allocation but it needs to be updated when spills /  
spilts happen.

Evan

On Mar 7, 2008, at 12:53 PM, David Greene wrote:
> Is there a convenient way to get the number of live intervals at any
> program point?  Bonus if there's an easy way to iterate through all
> of the live intervals at each program point.
>
> Ideally I'd like to give some routine an instruction index and have
> it return an iterator to all live intervals at that point.
>
>                                           -Dave
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