[LLVMdev] Register allocation questions

[Sam Kaplan]

Hello,

I am currently working another register allocator for LLVM, and I have a 
few questions.

I have a list of LiveIntervals that interfere with each other, and once 
I figure out that I need to spill one of these, I'm using 
LiveIntervals::addIntervalsForSpills to generate spill code. I'm not 
sure I'm using this function correctly (or if it's even the right thing 
to use). Here are a few questions:

- What exactly is the SpillIs parameter for this function?

- The return value is a vector of LiveIntervals, but it looks like they 
have all been added to the LiveIntervals object already. Is this correct?

- Is the Spiller class functional? Using the -new-spill-framework option 
with the linearscan allocator is giving me crashes.

I'm using LLVM 2.6 (it's a project-wide requirement). It doesn't look 
like much of what I'm using has been changed for 2.7 anyway, but let me 
know if I'm wrong on this.

Thanks,
Sam