Moduleghc-9.14.1GHC2021

GHC.CmmToAsm.Reg.Graph.SpillCost

typetype SpillCostRecord = (VirtualReg, Int, Int, Int)

Records the expected cost to spill some register.

valueplusSpillCostRecord :: SpillCostRecord -> SpillCostRecord -> SpillCostRecord

Add two spill cost records.

valuepprSpillCostRecord

Show a spill cost record, including the degree from the graph and final calculated spill cost.

typetype SpillCostInfo = UniqFM VirtualReg SpillCostRecord

valuezeroSpillCostInfo :: SpillCostInfo

An empty map of spill costs.

valueplusSpillCostInfo :: SpillCostInfo -> SpillCostInfo -> SpillCostInfo

Add two spill cost infos.

valueslurpSpillCostInfo

Slurp out information used for determining spill costs.

For each vreg, the number of times it was written to, read from, and the number of instructions it was live on entry to (lifetime)

valuechooseSpill

Choose a node to spill from this graph

valuelifeMapFromSpillCostInfo

Extract a map of register lifetimes from a SpillCostInfo.