Trace more vectorisation failures

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

diff --git a/compiler/vectorise/VectUtils.hs b/compiler/vectorise/VectUtils.hs
index 718db85..df8c23f 100644 (file)
--- a/compiler/vectorise/VectUtils.hs
+++ b/compiler/vectorise/VectUtils.hs
@@ -3,11 +3,11 @@ module VectUtils (
   collectAnnValBinders,
   splitClosureTy,
   mkPADictType, mkPArrayType,
-  paDictArgType, paDictOfType,
-  paMethod, lengthPA, replicatePA, emptyPA,
+  paDictArgType, paDictOfType, paDFunType,
+  paMethod, lengthPA, replicatePA, emptyPA, liftPA,
   polyAbstract, polyApply, polyVApply,
   lookupPArrayFamInst,
-  hoistExpr, hoistPolyVExpr, takeHoisted,
+  hoistBinding, hoistExpr, hoistPolyVExpr, takeHoisted,
   buildClosure, buildClosures,
   mkClosureApp
 ) where
@@ -97,7 +97,7 @@ mkClosureTypes arg_tys res_ty
 mkPADictType :: Type -> VM Type
 mkPADictType ty
   = do
-      tc <- builtin paDictTyCon
+      tc <- builtin paTyCon
       return $ TyConApp tc [ty]
 
 mkPArrayType :: Type -> VM Type
@@ -140,11 +140,21 @@ paDictOfTyApp (TyVarTy tv) ty_args
       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'
+      dfun <- traceMaybeV "paDictOfTyApp" (ppr tc) (lookupTyConPA tc)
+      paDFunApply (Var dfun) ty_args
 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
 
+paDFunType :: TyCon -> VM Type
+paDFunType tc
+  = do
+      margs <- mapM paDictArgType tvs
+      res   <- mkPADictType (mkTyConApp tc arg_tys)
+      return . mkForAllTys tvs
+             $ mkFunTys [arg | Just arg <- margs] res
+  where
+    tvs = tyConTyVars tc
+    arg_tys = mkTyVarTys tvs
+
 paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
 paDFunApply dfun tys
   = do
@@ -170,6 +180,12 @@ replicatePA len x = liftM (`mkApps` [len,x])
 emptyPA :: Type -> VM CoreExpr
 emptyPA = paMethod emptyPAVar
 
+liftPA :: CoreExpr -> VM CoreExpr
+liftPA x
+  = do
+      lc <- builtin liftingContext
+      replicatePA (Var lc) x
+
 newLocalVVar :: FastString -> Type -> VM VVar
 newLocalVVar fs vty
   = do
@@ -209,12 +225,15 @@ polyVApply expr tys
 lookupPArrayFamInst :: Type -> VM (TyCon, [Type])
 lookupPArrayFamInst ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
 
+hoistBinding :: Var -> CoreExpr -> VM ()
+hoistBinding v e = updGEnv $ \env ->
+  env { global_bindings = (v,e) : global_bindings env }
+
 hoistExpr :: FastString -> CoreExpr -> VM Var
 hoistExpr fs expr
   = do
       var <- newLocalVar fs (exprType expr)
-      updGEnv $ \env ->
-        env { global_bindings = (var, expr) : global_bindings env }
+      hoistBinding var expr
       return var
 
 hoistVExpr :: VExpr -> VM VVar
@@ -259,17 +278,18 @@ mkClosureApp (vclo, lclo) (varg, larg)
   where
     (arg_ty, res_ty) = splitClosureTy (exprType vclo)
 
-buildClosures :: [TyVar] -> Var -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
-buildClosures tvs lc vars [arg_ty] res_ty mk_body
-  = buildClosure tvs lc vars arg_ty res_ty mk_body
-buildClosures tvs lc vars (arg_ty : arg_tys) res_ty mk_body
+buildClosures :: [TyVar] -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
+buildClosures tvs vars [arg_ty] res_ty mk_body
+  = buildClosure tvs vars arg_ty res_ty mk_body
+buildClosures tvs vars (arg_ty : arg_tys) res_ty mk_body
   = do
       res_ty' <- mkClosureTypes arg_tys res_ty
       arg <- newLocalVVar FSLIT("x") arg_ty
-      buildClosure tvs lc vars arg_ty res_ty'
+      buildClosure tvs vars arg_ty res_ty'
         . hoistPolyVExpr tvs
         $ do
-            clo <- buildClosures tvs lc (vars ++ [arg]) arg_tys res_ty mk_body
+            lc <- builtin liftingContext
+            clo <- buildClosures tvs (vars ++ [arg]) arg_tys res_ty mk_body
             return $ vLams lc (vars ++ [arg]) clo
 
 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
@@ -277,27 +297,29 @@ buildClosures tvs lc vars (arg_ty : arg_tys) res_ty mk_body
 --     f  = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
 --     f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
 --
-buildClosure :: [TyVar] -> Var -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
-buildClosure tvs lv vars arg_ty res_ty mk_body
+buildClosure :: [TyVar] -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
+buildClosure tvs vars arg_ty res_ty mk_body
   = do
-      (env_ty, env, bind) <- buildEnv lv vars
+      (env_ty, env, bind) <- buildEnv vars
       env_bndr <- newLocalVVar FSLIT("env") env_ty
       arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
 
       fn <- hoistPolyVExpr tvs
           $ do
+              lc    <- builtin liftingContext
               body  <- mk_body
               body' <- bind (vVar env_bndr)
-                            (vVarApps lv body (vars ++ [arg_bndr]))
+                            (vVarApps lc body (vars ++ [arg_bndr]))
               return (vLamsWithoutLC [env_bndr, arg_bndr] body')
 
       mkClosure arg_ty res_ty env_ty fn env
 
-buildEnv :: Var -> [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
-buildEnv lv vvs
+buildEnv :: [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
+buildEnv vvs
   = do
+      lc <- builtin liftingContext
       let (ty, venv, vbind) = mkVectEnv tys vs
-      (lenv, lbind) <- mkLiftEnv lv tys ls
+      (lenv, lbind) <- mkLiftEnv lc tys ls
       return (ty, (venv, lenv),
               \(venv,lenv) (vbody,lbody) ->
               do
@@ -318,28 +340,28 @@ mkVectEnv tys  vs  = (ty, mkCoreTup (map Var vs),
     ty = mkCoreTupTy tys
 
 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
-mkLiftEnv lv [ty] [v]
+mkLiftEnv lc [ty] [v]
   = return (Var v, \env body ->
                    do
                      len <- lengthPA (Var v)
                      return . Let (NonRec v env)
-                            $ Case len lv (exprType body) [(DEFAULT, [], body)])
+                            $ Case len lc (exprType body) [(DEFAULT, [], body)])
 
 -- NOTE: this transparently deals with empty environments
-mkLiftEnv lv tys vs
+mkLiftEnv lc tys vs
   = do
       (env_tc, env_tyargs) <- lookupPArrayFamInst vty
       let [env_con] = tyConDataCons env_tc
           
           env = Var (dataConWrapId env_con)
                 `mkTyApps`  env_tyargs
-                `mkVarApps` (lv : vs)
+                `mkVarApps` (lc : vs)
 
           bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
                           in
                           return $ Case scrut (mkWildId (exprType scrut))
                                         (exprType body)
-                                        [(DataAlt env_con, lv : bndrs, body)]
+                                        [(DataAlt env_con, lc : bndrs, body)]
       return (env, bind)
   where
     vty = mkCoreTupTy tys