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module T20725 where
import GHC.Cmm
import GHC.Cmm.Dataflow
import GHC.Cmm.Dataflow.Block
import GHC.Cmm.Dataflow.Collections
import GHC.Cmm.Dataflow.Graph
import GHC.Cmm.Dataflow.Label
data TrivialFact = TrivialFact
trivialLattice :: DataflowLattice TrivialFact
trivialLattice = DataflowLattice TrivialFact (\_ _ -> NotChanged TrivialFact)
-- | ensures that analysis is possible independent of node type
trivialMap :: forall node .
(NonLocal node)
=> GenCmmGraph node
-> LabelMap TrivialFact
trivialMap g =
analyzeCmmFwd trivialLattice transfer g startFacts
where startFacts = mkFactBase trivialLattice []
transfer block facts =
asBase [(successor, TrivialFact) | successor <- successors block]
where asBase = mkFactBase trivialLattice
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