[llvm-dev] Which register allocator is used for each -O level?

[Quentin Colombet via llvm-dev]

Hi Phil,

O0 should be the fast allocator and anything else should be greedy allocator.
Though IIRC, the target can override this behavior.

Cheers,
-Quentin
> On Jun 3, 2016, at 1:33 PM, Phil Tomson via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> I notice this from the  "Getting Started with LLVM Core Libraries" book:
> 
> "The default allocator is mapped to one of the four options and is selected
> depending on the current optimization level (the -O option)."
> 
> (the four options being pbqp, greedy, basic, fast)
> 
> Which -O option maps to which of these four options?
> 
> Phil
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