ghc-7.0.3: The GHC API

RegAlloc.Graph.SpillCost

Synopsis

- type SpillCostRecord = (VirtualReg, Int, Int, Int)
- plusSpillCostRecord :: SpillCostRecord -> SpillCostRecord -> SpillCostRecord
- pprSpillCostRecord :: (VirtualReg -> RegClass) -> (Reg -> SDoc) -> Graph VirtualReg RegClass RealReg -> SpillCostRecord -> SDoc
- type SpillCostInfo = UniqFM SpillCostRecord
- zeroSpillCostInfo :: SpillCostInfo
- plusSpillCostInfo :: SpillCostInfo -> SpillCostInfo -> SpillCostInfo
- slurpSpillCostInfo :: (Outputable instr, Instruction instr) => LiveCmmTop instr -> SpillCostInfo
- chooseSpill :: SpillCostInfo -> Graph VirtualReg RegClass RealReg -> VirtualReg
- lifeMapFromSpillCostInfo :: SpillCostInfo -> UniqFM (VirtualReg, Int)

# Documentation

type SpillCostRecord = (VirtualReg, Int, Int, Int)Source

plusSpillCostRecord :: SpillCostRecord -> SpillCostRecord -> SpillCostRecord Source

pprSpillCostRecord :: (VirtualReg -> RegClass) -> (Reg -> SDoc) -> Graph VirtualReg RegClass RealReg -> SpillCostRecord -> SDoc Source

Show a spill cost record, including the degree from the graph and final calulated spill cos

type SpillCostInfo = UniqFM SpillCostRecord Source

zeroSpillCostInfo :: SpillCostInfo Source

plusSpillCostInfo :: SpillCostInfo -> SpillCostInfo -> SpillCostInfo Source

Add two spillCostInfos

slurpSpillCostInfo :: (Outputable instr, Instruction instr) => LiveCmmTop instr -> SpillCostInfo Source

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)

chooseSpill :: SpillCostInfo -> Graph VirtualReg RegClass RealReg -> VirtualReg Source

Choose a node to spill from this graph

lifeMapFromSpillCostInfo :: SpillCostInfo -> UniqFM (VirtualReg, Int)Source