[LLVMdev] register allocation

[Jakob Stoklund Olesen]

On Jan 19, 2012, at 5:31 AM, Jonas Paulsson wrote:

> LLVM would have to be extended with an RegClass/register-attribute 'spillable'

What exactly are you proposing? Why can't you do what the PowerPC and Hexagon targets do?

Spill-free register allocation sounds great, why not do it for all register classes?

> , and a register allocator would have to implement register pairing. That would be PBQP, right?

If by pairing you mean GCC's multiple-alternatives, then PBQP should be able to support that.

/jakob

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