Only vectorise rank-1 expressions

[ghc-hetmet.git] / compiler / vectorise / VectUtils.hs

diff --git a/compiler/vectorise/VectUtils.hs b/compiler/vectorise/VectUtils.hs
index 76d625c..5cd0471 100644 (file)
--- a/compiler/vectorise/VectUtils.hs
+++ b/compiler/vectorise/VectUtils.hs
@@ -1,14 +1,63 @@
 module VectUtils (
-  paDictArgType
+  collectAnnTypeBinders, collectAnnTypeArgs, isAnnTypeArg,
+  splitClosureTy,
+  mkPADictType, mkPArrayType,
+  paDictArgType, paDictOfType
 ) where
 
 #include "HsVersions.h"
 
 import VectMonad
 
+import CoreSyn
 import Type
 import TypeRep
+import TyCon
 import Var
+import PrelNames
+
+import Outputable
+
+import Control.Monad         ( liftM )
+
+collectAnnTypeArgs :: AnnExpr b ann -> (AnnExpr b ann, [Type])
+collectAnnTypeArgs expr = go expr []
+  where
+    go (_, AnnApp f (_, AnnType ty)) tys = go f (ty : tys)
+    go e                             tys = (e, tys)
+
+collectAnnTypeBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
+collectAnnTypeBinders expr = go [] expr
+  where
+    go bs (_, AnnLam b e) | isTyVar b = go (b:bs) e
+    go bs e                           = (reverse bs, e)
+
+isAnnTypeArg :: AnnExpr b ann -> Bool
+isAnnTypeArg (_, AnnType t) = True
+isAnnTypeArg _              = False
+
+isClosureTyCon :: TyCon -> Bool
+isClosureTyCon tc = tyConUnique tc == closureTyConKey
+
+splitClosureTy :: Type -> (Type, Type)
+splitClosureTy ty
+  | Just (tc, [arg_ty, res_ty]) <- splitTyConApp_maybe ty
+  , isClosureTyCon tc
+  = (arg_ty, res_ty)
+
+  | otherwise = pprPanic "splitClosureTy" (ppr ty)
+
+mkPADictType :: Type -> VM Type
+mkPADictType ty
+  = do
+      tc <- builtin paDictTyCon
+      return $ TyConApp tc [ty]
+
+mkPArrayType :: Type -> VM Type
+mkPArrayType ty
+  = do
+      tc <- builtin parrayTyCon
+      return $ TyConApp tc [ty]
 
 paDictArgType :: TyVar -> VM (Maybe Type)
 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
@@ -26,10 +75,32 @@ paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
 
     go ty k
       | isLiftedTypeKind k
-      = do
-          tc <- builtin paDictTyCon
-          return . Just $ TyConApp tc [ty]
-
+      = liftM Just (mkPADictType ty)
 
     go ty k = return Nothing
 
+paDictOfType :: Type -> VM CoreExpr
+paDictOfType ty = paDictOfTyApp ty_fn ty_args
+  where
+    (ty_fn, ty_args) = splitAppTys ty
+
+paDictOfTyApp :: Type -> [Type] -> VM CoreExpr
+paDictOfTyApp ty_fn ty_args
+  | Just ty_fn' <- coreView ty_fn = paDictOfTyApp ty_fn' ty_args
+paDictOfTyApp (TyVarTy tv) ty_args
+  = do
+      dfun <- maybeV (lookupTyVarPA tv)
+      paDFunApply dfun ty_args
+paDictOfTyApp (TyConApp tc _) ty_args
+  = do
+      pa_class <- builtin paClass
+      (dfun, ty_args') <- lookupInst pa_class [TyConApp tc ty_args]
+      paDFunApply (Var dfun) ty_args'
+paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
+
+paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
+paDFunApply dfun tys
+  = do
+      dicts <- mapM paDictOfType tys
+      return $ mkApps (mkTyApps dfun tys) dicts
+