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|
module GHC.CmmToAsm.CFG.Weight
( Weights (..)
, defaultWeights
, parseWeights
)
where
import GHC.Prelude
import GHC.Utils.Panic
-- | Edge weights to use when generating a CFG from CMM
data Weights = Weights
{ uncondWeight :: Int
, condBranchWeight :: Int
, switchWeight :: Int
, callWeight :: Int
, likelyCondWeight :: Int
, unlikelyCondWeight :: Int
, infoTablePenalty :: Int
, backEdgeBonus :: Int
}
-- | Default edge weights
defaultWeights :: Weights
defaultWeights = Weights
{ uncondWeight = 1000
, condBranchWeight = 800
, switchWeight = 1
, callWeight = -10
, likelyCondWeight = 900
, unlikelyCondWeight = 300
, infoTablePenalty = 300
, backEdgeBonus = 400
}
parseWeights :: String -> Weights -> Weights
parseWeights s oldWeights =
foldl' (\cfg (n,v) -> update n v cfg) oldWeights assignments
where
assignments = map assignment $ settings s
update "uncondWeight" n w =
w {uncondWeight = n}
update "condBranchWeight" n w =
w {condBranchWeight = n}
update "switchWeight" n w =
w {switchWeight = n}
update "callWeight" n w =
w {callWeight = n}
update "likelyCondWeight" n w =
w {likelyCondWeight = n}
update "unlikelyCondWeight" n w =
w {unlikelyCondWeight = n}
update "infoTablePenalty" n w =
w {infoTablePenalty = n}
update "backEdgeBonus" n w =
w {backEdgeBonus = n}
update other _ _
= panic $ other ++
" is not a CFG weight parameter. " ++
exampleString
settings s
| (s1,rest) <- break (== ',') s
, null rest
= [s1]
| (s1,rest) <- break (== ',') s
= s1 : settings (drop 1 rest)
assignment as
| (name, _:val) <- break (== '=') as
= (name,read val)
| otherwise
= panic $ "Invalid CFG weight parameters." ++ exampleString
exampleString = "Example parameters: uncondWeight=1000," ++
"condBranchWeight=800,switchWeight=0,callWeight=300" ++
",likelyCondWeight=900,unlikelyCondWeight=300" ++
",infoTablePenalty=300,backEdgeBonus=400"
|
