Remove unused imports

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

diff --git a/compiler/vectorise/Vectorise.hs b/compiler/vectorise/Vectorise.hs
index 3b6cd83..a0e3e1a 100644 (file)
--- a/compiler/vectorise/Vectorise.hs
+++ b/compiler/vectorise/Vectorise.hs
@@ -7,16 +7,13 @@ import VectUtils
 import VectType
 import VectCore
 
-import DynFlags
-import HscTypes
+import HscTypes hiding      ( MonadThings(..) )
 
-import Module               ( dphSeqPackageId, dphParPackageId )
-import CoreLint             ( showPass, endPass )
+import Module               ( PackageId )
 import CoreSyn
 import CoreUtils
 import CoreFVs
-import SimplMonad           ( SimplCount, zeroSimplCount )
-import Rules                ( RuleBase )
+import CoreMonad            ( CoreM, getHscEnv )
 import DataCon
 import TyCon
 import Type
@@ -27,8 +24,6 @@ import VarSet
 import Id
 import OccName
 
-import DsMonad
-
 import Literal              ( Literal, mkMachInt )
 import TysWiredIn
 
@@ -37,22 +32,18 @@ import FastString
 import Control.Monad        ( liftM, liftM2, zipWithM )
 import Data.List            ( sortBy, unzip4 )
 
-vectorise :: DPHBackend -> HscEnv -> UniqSupply -> RuleBase -> ModGuts
-          -> IO (SimplCount, ModGuts)
-vectorise backend hsc_env _ _ guts
+vectorise :: PackageId -> ModGuts -> CoreM ModGuts
+vectorise backend guts = do
+    hsc_env <- getHscEnv
+    liftIO $ vectoriseIO backend hsc_env guts
+
+vectoriseIO :: PackageId -> HscEnv -> ModGuts -> IO ModGuts
+vectoriseIO backend hsc_env guts
   = do
-      showPass dflags "Vectorisation"
       eps <- hscEPS hsc_env
       let info = hptVectInfo hsc_env `plusVectInfo` eps_vect_info eps
-      Just (info', guts') <- initV (backendPackage backend) hsc_env guts info
-                                   (vectModule guts)
-      endPass dflags "Vectorisation" Opt_D_dump_vect (mg_binds guts')
-      return (zeroSimplCount dflags, guts' { mg_vect_info = info' })
-  where
-    dflags = hsc_dflags hsc_env
-
-    backendPackage DPHSeq  = dphSeqPackageId
-    backendPackage DPHPar  = dphParPackageId
+      Just (info', guts') <- initV backend hsc_env guts info (vectModule guts)
+      return (guts' { mg_vect_info = info' })
 
 vectModule :: ModGuts -> VM ModGuts
 vectModule guts
@@ -200,7 +191,7 @@ vectPolyExpr (_, AnnNote note expr)
 vectPolyExpr expr
   = polyAbstract tvs $ \abstract ->
     do
-      mono' <- vectExpr mono
+      mono' <- vectFnExpr False mono
       return $ mapVect abstract mono'
   where
     (tvs, mono) = collectAnnTypeBinders expr
@@ -250,9 +241,6 @@ vectExpr (_, AnnCase scrut bndr ty alts)
   where
     scrut_ty = exprType (deAnnotate scrut)
 
-vectExpr (_, AnnCase _ _ _ _)
-  = panic "vectExpr: case"
-
 vectExpr (_, AnnLet (AnnNonRec bndr rhs) body)
   = do
       vrhs <- localV . inBind bndr $ vectPolyExpr rhs
@@ -273,16 +261,59 @@ vectExpr (_, AnnLet (AnnRec bs) body)
                       . inBind bndr
                       $ vectExpr rhs
 
-vectExpr e@(fvs, AnnLam bndr _)
-  | not (isId bndr) = pprPanic "vectExpr" (ppr $ deAnnotate e)
-  | otherwise = vectLam fvs bs body
+vectExpr e@(_, AnnLam bndr _)
+  | isId bndr = vectFnExpr True e
+{-
+onlyIfV (isEmptyVarSet fvs) (vectScalarLam bs $ deAnnotate body)
+                `orElseV` vectLam True fvs bs body
+  where
+    (bs,body) = collectAnnValBinders e
+-}
+
+vectExpr e = cantVectorise "Can't vectorise expression" (ppr $ deAnnotate e)
+
+vectFnExpr :: Bool -> CoreExprWithFVs -> VM VExpr
+vectFnExpr inline e@(fvs, AnnLam bndr _)
+  | isId bndr = onlyIfV (isEmptyVarSet fvs) (vectScalarLam bs $ deAnnotate body)
+                `orElseV` vectLam inline fvs bs body
   where
     (bs,body) = collectAnnValBinders e
+vectFnExpr _ e = vectExpr e
 
-vectExpr e = pprPanic "vectExpr" (ppr $ deAnnotate e)
 
-vectLam :: VarSet -> [Var] -> CoreExprWithFVs -> VM VExpr
-vectLam fvs bs body
+vectScalarLam :: [Var] -> CoreExpr -> VM VExpr
+vectScalarLam args body
+  = do
+      scalars <- globalScalars
+      onlyIfV (all is_scalar_ty arg_tys
+               && is_scalar_ty res_ty
+               && is_scalar (extendVarSetList scalars args) body)
+        $ do
+            fn_var <- hoistExpr (fsLit "fn") (mkLams args body)
+            zipf <- zipScalars arg_tys res_ty
+            clo <- scalarClosure arg_tys res_ty (Var fn_var)
+                                                (zipf `App` Var fn_var)
+            clo_var <- hoistExpr (fsLit "clo") clo
+            lclo <- liftPA (Var clo_var)
+            return (Var clo_var, lclo)
+  where
+    arg_tys = map idType args
+    res_ty  = exprType body
+
+    is_scalar_ty ty | Just (tycon, []) <- splitTyConApp_maybe ty
+                    = tycon == intTyCon
+                      || tycon == floatTyCon
+                      || tycon == doubleTyCon
+
+                    | otherwise = False
+
+    is_scalar vs (Var v)     = v `elemVarSet` vs
+    is_scalar _ e@(Lit _)    = is_scalar_ty $ exprType e
+    is_scalar vs (App e1 e2) = is_scalar vs e1 && is_scalar vs e2
+    is_scalar _ _            = False
+
+vectLam :: Bool -> VarSet -> [Var] -> CoreExprWithFVs -> VM VExpr
+vectLam inline fvs bs body
   = do
       tyvars <- localTyVars
       (vs, vvs) <- readLEnv $ \env ->
@@ -298,11 +329,14 @@ vectLam fvs bs body
             lc <- builtin liftingContext
             (vbndrs, vbody) <- vectBndrsIn (vs ++ bs)
                                            (vectExpr body)
-            return $ vLams lc vbndrs vbody
+            return . maybe_inline $ vLams lc vbndrs vbody
+  where
+    maybe_inline = if inline then vInlineMe else id
 
 vectTyAppExpr :: CoreExprWithFVs -> [Type] -> VM VExpr
 vectTyAppExpr (_, AnnVar v) tys = vectPolyVar v tys
-vectTyAppExpr e _ = pprPanic "vectTyAppExpr" (ppr $ deAnnotate e)
+vectTyAppExpr e tys = cantVectorise "Can't vectorise expression"
+                        (ppr $ deAnnotate e `mkTyApps` tys)
 
 -- We convert
 --
@@ -374,11 +408,13 @@ vectAlgCase tycon _ty_args scrut bndr ty alts
       let (vect_scrut,  lift_scrut)  = vscrut
           (vect_bodies, lift_bodies) = unzip vbodies
 
-      let vect_case = Case vect_scrut (mkWildId (exprType vect_scrut)) vty
+      vdummy <- newDummyVar (exprType vect_scrut)
+      ldummy <- newDummyVar (exprType lift_scrut)
+      let vect_case = Case vect_scrut vdummy vty
                            (zipWith3 mk_vect_alt vect_dcs vect_bndrss vect_bodies)
 
       lbody <- combinePA vty len sel indices lift_bodies
-      let lift_case = Case lift_scrut (mkWildId (exprType lift_scrut)) lty
+      let lift_case = Case lift_scrut ldummy lty
                            [(DataAlt arr_dc, shape_bndrs ++ concat lift_bndrss,
                              lbody)]