A spill metric is a heuristic metric used by register allocators to decide with registers to spill. Popular spill metrics are:
* "cost" / "degree" - introduced in Chaitlin's algorithm
* "cost" / "degree2" - emphasizes the spill's effect on neighbours
* "cost" - emphasizes
* minimising number of spill operations
Where "cost" is the estimated cost of spilling a value from registers into memory.
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