Modify generation of PR dictionaries for new scheme

compiler/vectorise/VectType.hs

@@ -26,7 +26,7 @@ import Var               ( Var )
 import Id                ( mkWildId )
 import Name              ( Name, getOccName )
 import NameEnv
-import TysWiredIn        ( unitTy, intTy, intDataCon, unitDataConId )
+import TysWiredIn        ( unitTy, unitTyCon, intTy, intDataCon, unitDataConId )
 import TysPrim           ( intPrimTy )
 
 import Unique
@@ -337,12 +337,36 @@ buildFromArrPRepr _ vect_tc prepr_tc arr_tc
   = mkFromArrPRepr undefined undefined undefined undefined undefined undefined
 
 buildPRDict :: TyConRepr -> TyCon -> TyCon -> TyCon -> VM CoreExpr
-buildPRDict _ vect_tc prepr_tc _
-  = prCoerce prepr_tc var_tys
-  =<< prDictOfType (mkTyConApp prepr_tc var_tys)
+buildPRDict (TyConRepr {
+                repr_tys         = repr_tys
+              , repr_prod_tycons = prod_tycons
+              , repr_prod_tys    = prod_tys
+              , repr_sum_tycon   = repr_sum_tycon
+              })
+            vect_tc prepr_tc _
+  = do
+      prs      <- mapM (mapM mkPR) repr_tys
+      prod_prs <- sequence $ zipWith3 mk_prod_pr prod_tycons repr_tys prs
+      sum_pr   <- mk_sum_pr prod_prs
+      prCoerce prepr_tc var_tys sum_pr
   where
     var_tys = mkTyVarTys $ tyConTyVars vect_tc
 
+    Just sum_tycon = repr_sum_tycon
+
+    mk_prod_pr _         _   []   = prDFunOfTyCon unitTyCon
+    mk_prod_pr _         _   [pr] = return pr
+    mk_prod_pr (Just tc) tys prs
+      = do
+          dfun <- prDFunOfTyCon tc
+          return $ dfun `mkTyApps` tys `mkApps` prs
+
+    mk_sum_pr [pr] = return pr
+    mk_sum_pr prs
+      = do
+          dfun <- prDFunOfTyCon sum_tycon
+          return $ dfun `mkTyApps` prod_tys `mkApps` prs
+
 buildPArrayTyCon :: TyCon -> TyCon -> VM TyCon
 buildPArrayTyCon orig_tc vect_tc = fixV $ \repr_tc ->
   do

compiler/vectorise/VectUtils.hs

@@ -9,9 +9,9 @@ module VectUtils (
   mkPADictType, mkPArrayType, mkPReprType,
 
   parrayCoerce, parrayReprTyCon, parrayReprDataCon, mkVScrut,
-  prDictOfType, prCoerce,
+  prDFunOfTyCon, prCoerce,
   paDictArgType, paDictOfType, paDFunType,
-  paMethod, lengthPA, replicatePA, emptyPA, liftPA,
+  paMethod, mkPR, lengthPA, replicatePA, emptyPA, liftPA,
   polyAbstract, polyApply, polyVApply,
   hoistBinding, hoistExpr, hoistPolyVExpr, takeHoisted,
   buildClosure, buildClosures,
@@ -248,35 +248,9 @@ mkVScrut (ve, le)
       (tc, arg_tys) <- parrayReprTyCon (exprType ve)
       return ((ve, unwrapFamInstScrut tc arg_tys le), tc, arg_tys)
 
-prDictOfType :: Type -> VM CoreExpr
-prDictOfType orig_ty
-  | Just (tycon, ty_args) <- splitTyConApp_maybe orig_ty
-  = do
-      dfun <- traceMaybeV "prDictOfType" (ppr tycon) (lookupTyConPR tycon)
-      prDFunApply (Var dfun) ty_args
-
-prDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
-prDFunApply dfun tys
-  = do
-      args <- mapM mkDFunArg arg_tys
-      return $ mkApps mono_dfun args
-  where
-    mono_dfun    = mkTyApps dfun tys
-    (arg_tys, _) = splitFunTys (exprType mono_dfun)
-
-mkDFunArg :: Type -> VM CoreExpr
-mkDFunArg ty
-  | Just (tycon, [arg]) <- splitTyConApp_maybe ty
-
-  = let name = tyConName tycon
-
-        get_dict | name == paTyConName = paDictOfType
-                 | name == prTyConName = prDictOfType
-                 | otherwise           = pprPanic "mkDFunArg" (ppr ty)
-
-    in get_dict arg
-
-mkDFunArg ty = pprPanic "mkDFunArg" (ppr ty)
+prDFunOfTyCon :: TyCon -> VM CoreExpr
+prDFunOfTyCon tycon
+  = liftM Var (traceMaybeV "prDictOfTyCon" (ppr tycon) (lookupTyConPR tycon))
 
 prCoerce :: TyCon -> [Type] -> CoreExpr -> VM CoreExpr
 prCoerce repr_tc args expr