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# Chapter 20: Graph Coloring Register Allocation
This is a Briggs-Chaitan-Click allocator, and is very similar to the one used
in HotSpot's C2 allocator for the past 25 years with great success.
You can also read [this chapter](https://github.com/SeaOfNodes/Simple/tree/linear-chapter20) in a linear Git revision history on the [linear](https://github.com/SeaOfNodes/Simple/tree/linear) branch and [compare](https://github.com/SeaOfNodes/Simple/compare/linear-chapter19...linear-chapter20) it to the previous chapter.
## Registers
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