Generate conversion from PRepr to original type

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

diff --git a/compiler/vectorise/VectType.hs b/compiler/vectorise/VectType.hs
index e8afb46..c77343b 100644 (file)
--- a/compiler/vectorise/VectType.hs
+++ b/compiler/vectorise/VectType.hs
@@ -37,7 +37,7 @@ import Digraph           ( SCC(..), stronglyConnComp )
 import Outputable
 
 import Control.Monad  ( liftM, liftM2, zipWithM, zipWithM_ )
-import Data.List      ( inits, tails, zipWith4 )
+import Data.List      ( inits, tails, zipWith4, zipWith5 )
 
 -- ----------------------------------------------------------------------------
 -- Types
@@ -101,8 +101,12 @@ vectTypeEnv env
       parr_tcs <- zipWithM buildPArrayTyCon orig_tcs vect_tcs
       dfuns    <- mapM mkPADFun vect_tcs
       defTyConPAs (zip vect_tcs dfuns)
-      binds    <- sequence (zipWith4 buildTyConBindings orig_tcs vect_tcs parr_tcs dfuns)
-      
+      binds    <- sequence (zipWith5 buildTyConBindings orig_tcs
+                                                        vect_tcs
+                                                        repr_tcs
+                                                        parr_tcs
+                                                        dfuns)
+
       let all_new_tcs = new_tcs ++ repr_tcs ++ parr_tcs
 
       let new_env = extendTypeEnvList env
@@ -195,7 +199,7 @@ buildPReprTyCon :: TyCon -> TyCon -> VM TyCon
 buildPReprTyCon orig_tc vect_tc
   = do
       name     <- cloneName mkPReprTyConOcc (tyConName orig_tc)
-      rhs_ty   <- buildPReprRhsTy vect_tc
+      rhs_ty   <- buildPReprType vect_tc
       prepr_tc <- builtin preprTyCon
       liftDs $ buildSynTyCon name
                              tyvars
@@ -204,27 +208,45 @@ buildPReprTyCon orig_tc vect_tc
   where
     tyvars = tyConTyVars vect_tc
 
-buildPReprRhsTy :: TyCon -> VM Type
-buildPReprRhsTy = buildPReprTy . map dataConRepArgTys . tyConDataCons
+buildPReprType :: TyCon -> VM Type
+buildPReprType = mkPRepr . map dataConRepArgTys . tyConDataCons
+
+buildToPRepr :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
+buildToPRepr _ vect_tc prepr_tc _
+  = do
+      arg <- newLocalVar FSLIT("x") arg_ty
+      bndrss <- mapM (mapM (newLocalVar FSLIT("x"))) rep_tys
+      (alt_bodies, res_ty) <- mkToPRepr $ map (map Var) bndrss
+
+      return . Lam arg
+             . wrapFamInstBody prepr_tc var_tys
+             . Case (Var arg) (mkWildId arg_ty) res_ty
+             $ zipWith3 mk_alt data_cons bndrss alt_bodies
+  where
+    var_tys   = mkTyVarTys $ tyConTyVars vect_tc
+    arg_ty    = mkTyConApp vect_tc var_tys
+    data_cons = tyConDataCons vect_tc
+    rep_tys   = map dataConRepArgTys data_cons
+
+    mk_alt data_con bndrs body = (DataAlt data_con, bndrs, body)
 
-buildPReprTy :: [[Type]] -> VM Type
-buildPReprTy [] = panic "mkPRepr"
-buildPReprTy tys
+buildFromPRepr :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
+buildFromPRepr _ vect_tc prepr_tc _
   = do
-      embed <- builtin embedTyCon
-      plus  <- builtin plusTyCon
-      cross <- builtin crossTyCon
-
-      return . foldr1 (mk_bin plus)
-             . map (mkprod cross)
-             . map (map (mk_un embed))
-             $ tys
+      arg_ty <- mkPReprType res_ty
+      arg <- newLocalVar FSLIT("x") arg_ty
+      alts <- mapM mk_alt data_cons
+      body <- mkFromPRepr (unwrapFamInstScrut prepr_tc var_tys (Var arg))
+                          res_ty alts
+      return $ Lam arg body
   where
-    mkprod cross []  = unitTy
-    mkprod cross tys = foldr1 (mk_bin cross) tys
+    var_tys   = mkTyVarTys $ tyConTyVars vect_tc
+    res_ty    = mkTyConApp vect_tc var_tys
+    data_cons = tyConDataCons vect_tc
 
-    mk_un  tc ty      = mkTyConApp tc [ty]
-    mk_bin tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
+    mk_alt dc = do
+                  bndrs <- mapM (newLocalVar FSLIT("x")) $ dataConRepArgTys dc
+                  return (bndrs, mkConApp dc (map Type var_tys ++ map Var bndrs))
 
 buildPArrayTyCon :: TyCon -> TyCon -> VM TyCon
 buildPArrayTyCon orig_tc vect_tc = fixV $ \repr_tc ->
@@ -307,8 +329,9 @@ tyConShape vect_tc
                                                return [e]
                }
 
-buildTyConBindings :: TyCon -> TyCon -> TyCon -> Var -> VM [(Var, CoreExpr)]
-buildTyConBindings orig_tc vect_tc arr_tc dfun
+buildTyConBindings :: TyCon -> TyCon -> TyCon -> TyCon -> Var
+                   -> VM [(Var, CoreExpr)]
+buildTyConBindings orig_tc vect_tc prepr_tc arr_tc dfun
   = do
       shape <- tyConShape vect_tc
       sequence_ (zipWith4 (vectDataConWorker shape vect_tc arr_tc arr_dc)
@@ -316,7 +339,7 @@ buildTyConBindings orig_tc vect_tc arr_tc dfun
                           vect_dcs
                           (inits repr_tys)
                           (tails repr_tys))
-      dict <- buildPADict shape vect_tc arr_tc dfun
+      dict <- buildPADict shape vect_tc prepr_tc arr_tc dfun
       binds <- takeHoisted
       return $ (dfun, dict) : binds
   where
@@ -368,8 +391,8 @@ vectDataConWorker shape vect_tc arr_tc arr_dc orig_dc vect_dc pre (dc_tys : post
                                           ++ map Var args
                                           ++ empty_post
 
-buildPADict :: Shape -> TyCon -> TyCon -> Var -> VM CoreExpr
-buildPADict shape vect_tc arr_tc dfun
+buildPADict :: Shape -> TyCon -> TyCon -> TyCon -> Var -> VM CoreExpr
+buildPADict shape vect_tc prepr_tc arr_tc dfun
   = polyAbstract tvs $ \abstract ->
     do
       meth_binds <- mapM (mk_method shape) paMethods
@@ -386,15 +409,17 @@ buildPADict shape vect_tc arr_tc dfun
     mk_method shape (name, build)
       = localV
       $ do
-          body <- build shape vect_tc arr_tc
+          body <- build shape vect_tc prepr_tc arr_tc
           var  <- newLocalVar name (exprType body)
           return (var, mkInlineMe body)
           
 paMethods = [(FSLIT("lengthPA"),    buildLengthPA),
-             (FSLIT("replicatePA"), buildReplicatePA)]
+             (FSLIT("replicatePA"), buildReplicatePA),
+             (FSLIT("toPRepr"),     buildToPRepr),
+             (FSLIT("fromPRepr"),   buildFromPRepr)]
 
-buildLengthPA :: Shape -> TyCon -> TyCon -> VM CoreExpr
-buildLengthPA shape vect_tc arr_tc
+buildLengthPA :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
+buildLengthPA shape vect_tc _ arr_tc
   = do
       parr_ty <- mkPArrayType (mkTyConApp vect_tc arg_tys)
       arg    <- newLocalVar FSLIT("xs") parr_ty
@@ -442,8 +467,8 @@ buildLengthPA shape vect_tc arr_tc
 --
 --
 
-buildReplicatePA :: Shape -> TyCon -> TyCon -> VM CoreExpr
-buildReplicatePA shape vect_tc arr_tc
+buildReplicatePA :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
+buildReplicatePA shape vect_tc _ arr_tc
   = do
       len_var <- newLocalVar FSLIT("n") intPrimTy
       val_var <- newLocalVar FSLIT("x") val_ty