Try not to avoid vectorising purely scalar functions

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

diff --git a/compiler/vectorise/Vectorise.hs b/compiler/vectorise/Vectorise.hs
index 8d8bfef..bee160c 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 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, liftIO )
 import DataCon
 import TyCon
 import Type
@@ -37,23 +34,18 @@ 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
-    backendPackage DPHThis = thisPackage dflags
+      Just (info', guts') <- initV backend hsc_env guts info (vectModule guts)
+      return (guts' { mg_vect_info = info' })
 
 vectModule :: ModGuts -> VM ModGuts
 vectModule guts
@@ -272,12 +264,44 @@ vectExpr (_, AnnLet (AnnRec bs) body)
                       $ vectExpr rhs
 
 vectExpr e@(fvs, AnnLam bndr _)
-  | isId bndr = vectLam fvs bs body
+  | isId bndr = onlyIfV (isEmptyVarSet fvs) (vectScalarLam bs $ deAnnotate body)
+                `orElseV` vectLam fvs bs body
   where
     (bs,body) = collectAnnValBinders e
 
 vectExpr e = cantVectorise "Can't vectorise expression" (ppr $ deAnnotate e)
 
+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 l)    = is_scalar_ty $ exprType e
+    is_scalar vs (App e1 e2) = is_scalar vs e1 && is_scalar vs e2
+    is_scalar _ _            = False
+
 vectLam :: VarSet -> [Var] -> CoreExprWithFVs -> VM VExpr
 vectLam fvs bs body
   = do