Add generation of PR dictionaries

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

diff --git a/compiler/vectorise/VectUtils.hs b/compiler/vectorise/VectUtils.hs
index bbcd91c..b00206d 100644 (file)
--- a/compiler/vectorise/VectUtils.hs
+++ b/compiler/vectorise/VectUtils.hs
@@ -3,9 +3,10 @@ module VectUtils (
   collectAnnValBinders,
   mkDataConTag,
   splitClosureTy,
-  mkPReprType, mkPReprAlts,
-  mkPADictType, mkPArrayType,
+  mkPRepr, mkToPRepr, mkFromPRepr,
+  mkPADictType, mkPArrayType, mkPReprType,
   parrayReprTyCon, parrayReprDataCon, mkVScrut,
+  prDictOfType,
   paDictArgType, paDictOfType, paDFunType,
   paMethod, lengthPA, replicatePA, emptyPA, liftPA,
   polyAbstract, polyApply, polyVApply,
@@ -37,7 +38,7 @@ import BasicTypes         ( Boxity(..) )
 import Outputable
 import FastString
 
-import Control.Monad         ( liftM, zipWithM_ )
+import Control.Monad         ( liftM, liftM2, zipWithM_ )
 
 collectAnnTypeArgs :: AnnExpr b ann -> (AnnExpr b ann, [Type])
 collectAnnTypeArgs expr = go expr []
@@ -120,9 +121,9 @@ mkBuiltinTyConApps1 get_tc dft tys
   where
     mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
 
-mkPReprType :: [[Type]] -> VM Type
-mkPReprType [] = return unitTy
-mkPReprType tys
+mkPRepr :: [[Type]] -> VM Type
+mkPRepr [] = return unitTy
+mkPRepr tys
   = do
       embed <- builtin embedTyCon
       cross <- builtin crossTyCon
@@ -142,8 +143,8 @@ mkPReprType tys
              . map (mk_tup . map mk_embed)
              $ tys
 
-mkPReprAlts :: [[CoreExpr]] -> VM ([CoreExpr], Type)
-mkPReprAlts ess
+mkToPRepr :: [[CoreExpr]] -> VM ([CoreExpr], Type)
+mkToPRepr ess
   = do
       embed_tc <- builtin embedTyCon
       embed_dc <- builtin embedDataCon
@@ -153,9 +154,10 @@ mkPReprAlts ess
       left_dc  <- builtin leftDataCon
       right_dc <- builtin rightDataCon
 
-      let mk_embed (expr, ty, pa)
-            = (mkConApp   embed_dc [Type ty, pa, expr],
+      let mk_embed expr
+            = (mkConApp   embed_dc [Type ty, expr],
                mkTyConApp embed_tc [ty])
+            where ty = exprType expr
 
           mk_cross (expr1, ty1) (expr2, ty2)
             = (mkConApp   cross_dc [Type ty1, Type ty2, expr1, expr2],
@@ -172,14 +174,55 @@ mkPReprAlts ess
               (mkConApp left_dc [Type lty, Type rty, expr]
                  : [mkConApp right_dc [Type lty, Type rty, alt] | alt <- alts],
                mkTyConApp plus_tc [lty, rty])
-      
-      liftM (mk_sum . map (mk_tup . map mk_embed))
-            (mapM (mapM init) ess)
-  where
-    init expr = let ty = exprType expr
-                in do
-                     pa <- paDictOfType ty
-                     return (expr, ty, pa)
+
+      return . mk_sum $ map (mk_tup . map mk_embed) ess
+
+mkFromPRepr :: CoreExpr -> Type -> [([Var], CoreExpr)] -> VM CoreExpr
+mkFromPRepr scrut res_ty alts
+  = do
+      embed_dc <- builtin embedDataCon
+      cross_dc <- builtin crossDataCon
+      left_dc  <- builtin leftDataCon
+      right_dc <- builtin rightDataCon
+      pa_tc    <- builtin paTyCon
+
+      let un_embed expr ty var res
+            = Case expr (mkWildId ty) res_ty
+                   [(DataAlt embed_dc, [var], res)]
+
+          un_cross expr ty var1 var2 res
+            = Case expr (mkWildId ty) res_ty
+                [(DataAlt cross_dc, [var1, var2], res)]
+
+          un_tup expr ty []    res = return res
+          un_tup expr ty [var] res = return $ un_embed expr ty var res
+          un_tup expr ty (var : vars) res
+            = do
+                lv <- newLocalVar FSLIT("x") lty
+                rv <- newLocalVar FSLIT("y") rty
+                liftM (un_cross expr ty lv rv
+                      . un_embed (Var lv) lty var)
+                      (un_tup (Var rv) rty vars res)
+            where
+              (lty, rty) = splitCrossTy ty
+
+          un_plus expr ty var1 var2 res1 res2
+            = Case expr (mkWildId ty) res_ty
+                [(DataAlt left_dc,  [var1], res1),
+                 (DataAlt right_dc, [var2], res2)]
+
+          un_sum expr ty [(vars, res)] = un_tup expr ty vars res
+          un_sum expr ty ((vars, res) : alts)
+            = do
+                lv <- newLocalVar FSLIT("l") lty
+                rv <- newLocalVar FSLIT("r") rty
+                liftM2 (un_plus expr ty lv rv)
+                         (un_tup (Var lv) lty vars res)
+                         (un_sum (Var rv) rty alts)
+            where
+              (lty, rty) = splitPlusTy ty
+
+      un_sum scrut (exprType scrut) alts
 
 mkClosureType :: Type -> Type -> VM Type
 mkClosureType arg_ty res_ty = mkBuiltinTyConApp closureTyCon [arg_ty, res_ty]
@@ -187,6 +230,9 @@ mkClosureType arg_ty res_ty = mkBuiltinTyConApp closureTyCon [arg_ty, res_ty]
 mkClosureTypes :: [Type] -> Type -> VM Type
 mkClosureTypes = mkBuiltinTyConApps closureTyCon
 
+mkPReprType :: Type -> VM Type
+mkPReprType ty = mkBuiltinTyConApp preprTyCon [ty]
+
 mkPADictType :: Type -> VM Type
 mkPADictType ty = mkBuiltinTyConApp paTyCon [ty]
 
@@ -209,6 +255,37 @@ 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)
+
 paDictArgType :: TyVar -> VM (Maybe Type)
 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
   where