ghc-8.4.4: The GHC API

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

Records the expected cost to spill some regster.

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 cost.

zeroSpillCostInfo :: SpillCostInfo Source #

An empty map of spill costs.

slurpSpillCostInfo :: (Outputable instr, Instruction instr) => Platform -> LiveCmmDecl statics 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 #

Extract a map of register lifetimes from a SpillCostInfo.