Commit aba1fff3 authored by rl@cse.unsw.edu.au's avatar rl@cse.unsw.edu.au
Browse files

Classification of tycons for vectorisation

parent f8bfbc44
......@@ -6,10 +6,15 @@ where
import VectMonad
import VectUtils
import DataCon
import TyCon
import Type
import TypeRep
import UniqFM
import UniqSet
import Digraph ( SCC(..), stronglyConnComp )
import Outputable
import Control.Monad ( liftM2 )
......@@ -47,3 +52,66 @@ vectType ty@(ForAllTy _ _)
vectType ty = pprPanic "vectType:" (ppr ty)
-- ----------------------------------------------------------------------------
-- Type definitions
type TyConGroup = ([TyCon], UniqSet TyCon)
-- | Split the given tycons into two sets depending on whether they have to be
-- converted (first list) or not (second list). The first argument contains
-- information about the conversion status of external tycons:
--
-- * tycons which have converted versions are mapped to True
-- * tycons which are not changed by vectorisation are mapped to False
-- * tycons which can't be converted are not elements of the map
--
classifyTyCons :: UniqFM Bool -> [TyConGroup] -> ([TyCon], [TyCon])
classifyTyCons = classify [] []
where
classify conv keep cs [] = (conv, keep)
classify conv keep cs ((tcs, ds) : rs)
| can_convert && must_convert
= classify (tcs ++ conv) keep (cs `addListToUFM` [(tc,True) | tc <- tcs]) rs
| can_convert
= classify conv (tcs ++ keep) (cs `addListToUFM` [(tc,False) | tc <- tcs]) rs
| otherwise
= classify conv keep cs rs
where
refs = ds `delListFromUniqSet` tcs
can_convert = isNullUFM (refs `minusUFM` cs) && all convertable tcs
must_convert = foldUFM (||) False (intersectUFM_C const cs refs)
convertable tc = isDataTyCon tc && all isVanillaDataCon (tyConDataCons tc)
-- | Compute mutually recursive groups of tycons in topological order
--
tyConGroups :: [TyCon] -> [TyConGroup]
tyConGroups tcs = map mk_grp (stronglyConnComp edges)
where
edges = [((tc, ds), tc, uniqSetToList ds) | tc <- tcs
, let ds = tyConsOfTyCon tc]
mk_grp (AcyclicSCC (tc, ds)) = ([tc], ds)
mk_grp (CyclicSCC els) = (tcs, unionManyUniqSets dss)
where
(tcs, dss) = unzip els
tyConsOfTyCon :: TyCon -> UniqSet TyCon
tyConsOfTyCon
= tyConsOfTypes . concatMap dataConRepArgTys . tyConDataCons
tyConsOfType :: Type -> UniqSet TyCon
tyConsOfType ty
| Just ty' <- coreView ty = tyConsOfType ty'
tyConsOfType (TyVarTy v) = emptyUniqSet
tyConsOfType (TyConApp tc tys) = tyConsOfTypes tys `addOneToUniqSet` tc
tyConsOfType (AppTy a b) = tyConsOfType a `unionUniqSets` tyConsOfType b
tyConsOfType (FunTy a b) = (tyConsOfType a `unionUniqSets` tyConsOfType b)
`addOneToUniqSet` funTyCon
tyConsOfType (ForAllTy _ ty) = tyConsOfType ty
tyConsOfType other = pprPanic "ClosureConv.tyConsOfType" $ ppr other
tyConsOfTypes :: [Type] -> UniqSet TyCon
tyConsOfTypes = unionManyUniqSets . map tyConsOfType
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