From: Roman Leshchinskiy <rl@cse.unsw.edu.au>
Date: Tue, 17 Jul 2007 05:03:37 +0000 (+0000)
Subject: Classification of tycons for vectorisation
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=aba1fff3e9c8f4f3c7d65f48354447b02b06bf1f

Classification of tycons for vectorisation
---

diff --git a/compiler/vectorise/VectType.hs b/compiler/vectorise/VectType.hs
index fb0b9dc..c7c2468 100644
--- a/compiler/vectorise/VectType.hs
+++ b/compiler/vectorise/VectType.hs
@@ -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
+