Vectorise.hs 15.3 KB
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module Vectorise( vectorise )
where

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import VectMonad
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import VectUtils
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import VectType
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import VectCore
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import HscTypes hiding      ( MonadThings(..) )
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import Module               ( PackageId )
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import CoreSyn
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import CoreUtils
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import MkCore               ( mkWildCase )
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import CoreFVs
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import CoreMonad            ( CoreM, getHscEnv )
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import DataCon
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import TyCon
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import Type
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import FamInstEnv           ( extendFamInstEnvList )
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import Var
import VarEnv
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import VarSet
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import Id
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import OccName
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import Literal              ( Literal, mkMachInt )
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import TysWiredIn
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import TysPrim              ( intPrimTy )
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import Outputable
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import FastString
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import Control.Monad        ( liftM, liftM2, zipWithM )
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import Data.List            ( sortBy, unzip4 )
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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
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  = do
      eps <- hscEPS hsc_env
      let info = hptVectInfo hsc_env `plusVectInfo` eps_vect_info eps
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      Just (info', guts') <- initV backend hsc_env guts info (vectModule guts)
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      return (guts' { mg_vect_info = info' })
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vectModule :: ModGuts -> VM ModGuts
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vectModule guts
  = do
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      (types', fam_insts, tc_binds) <- vectTypeEnv (mg_types guts)
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      let fam_inst_env' = extendFamInstEnvList (mg_fam_inst_env guts) fam_insts
      updGEnv (setFamInstEnv fam_inst_env')
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      -- dicts   <- mapM buildPADict pa_insts
      -- workers <- mapM vectDataConWorkers pa_insts
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      binds'  <- mapM vectTopBind (mg_binds guts)
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      return $ guts { mg_types        = types'
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                    , mg_binds        = Rec tc_binds : binds'
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                    , mg_fam_inst_env = fam_inst_env'
                    , mg_fam_insts    = mg_fam_insts guts ++ fam_insts
                    }
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vectTopBind :: CoreBind -> VM CoreBind
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vectTopBind b@(NonRec var expr)
  = do
      var'  <- vectTopBinder var
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      expr' <- vectTopRhs var expr
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      hs    <- takeHoisted
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      cexpr <- tryConvert var var' expr
      return . Rec $ (var, cexpr) : (var', expr') : hs
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  `orElseV`
    return b

vectTopBind b@(Rec bs)
  = do
      vars'  <- mapM vectTopBinder vars
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      exprs' <- zipWithM vectTopRhs vars exprs
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      hs     <- takeHoisted
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      cexprs <- sequence $ zipWith3 tryConvert vars vars' exprs
      return . Rec $ zip vars cexprs ++ zip vars' exprs' ++ hs
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  `orElseV`
    return b
  where
    (vars, exprs) = unzip bs

vectTopBinder :: Var -> VM Var
vectTopBinder var
  = do
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      vty  <- vectType (idType var)
      var' <- cloneId mkVectOcc var vty
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      defGlobalVar var var'
      return var'
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vectTopRhs :: Var -> CoreExpr -> VM CoreExpr
vectTopRhs var expr
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  = do
      closedV . liftM vectorised
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              . inBind var
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              $ vectPolyExpr (freeVars expr)
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tryConvert :: Var -> Var -> CoreExpr -> VM CoreExpr
tryConvert var vect_var rhs
  = fromVect (idType var) (Var vect_var) `orElseV` return rhs

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-- ----------------------------------------------------------------------------
-- Bindings
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vectBndr :: Var -> VM VVar
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vectBndr v
  = do
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      (vty, lty) <- vectAndLiftType (idType v)
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      let vv = v `Id.setIdType` vty
          lv = v `Id.setIdType` lty
      updLEnv (mapTo vv lv)
      return (vv, lv)
  where
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    mapTo vv lv env = env { local_vars = extendVarEnv (local_vars env) v (vv, lv) }
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vectBndrNew :: Var -> FastString -> VM VVar
vectBndrNew v fs
  = do
      vty <- vectType (idType v)
      vv  <- newLocalVVar fs vty
      updLEnv (upd vv)
      return vv
  where
    upd vv env = env { local_vars = extendVarEnv (local_vars env) v vv }

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vectBndrIn :: Var -> VM a -> VM (VVar, a)
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vectBndrIn v p
  = localV
  $ do
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      vv <- vectBndr v
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      x <- p
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      return (vv, x)
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vectBndrNewIn :: Var -> FastString -> VM a -> VM (VVar, a)
vectBndrNewIn v fs p
  = localV
  $ do
      vv <- vectBndrNew v fs
      x  <- p
      return (vv, x)

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vectBndrsIn :: [Var] -> VM a -> VM ([VVar], a)
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vectBndrsIn vs p
  = localV
  $ do
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      vvs <- mapM vectBndr vs
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      x <- p
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      return (vvs, x)
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-- ----------------------------------------------------------------------------
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-- Expressions

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vectVar :: Var -> VM VExpr
vectVar v
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  = do
      r <- lookupVar v
      case r of
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        Local (vv,lv) -> return (Var vv, Var lv)
        Global vv     -> do
                           let vexpr = Var vv
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                           lexpr <- liftPD vexpr
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                           return (vexpr, lexpr)
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vectPolyVar :: Var -> [Type] -> VM VExpr
vectPolyVar v tys
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  = do
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      vtys <- mapM vectType tys
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      r <- lookupVar v
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      case r of
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        Local (vv, lv) -> liftM2 (,) (polyApply (Var vv) vtys)
                                     (polyApply (Var lv) vtys)
        Global poly    -> do
                            vexpr <- polyApply (Var poly) vtys
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                            lexpr <- liftPD vexpr
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                            return (vexpr, lexpr)
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vectLiteral :: Literal -> VM VExpr
vectLiteral lit
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  = do
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      lexpr <- liftPD (Lit lit)
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      return (Lit lit, lexpr)

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vectPolyExpr :: CoreExprWithFVs -> VM VExpr
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vectPolyExpr (_, AnnNote note expr)
  = liftM (vNote note) $ vectPolyExpr expr
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vectPolyExpr expr
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  = polyAbstract tvs $ \abstract ->
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    do
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      mono' <- vectFnExpr False mono
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      return $ mapVect abstract mono'
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  where
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    (tvs, mono) = collectAnnTypeBinders expr

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vectExpr :: CoreExprWithFVs -> VM VExpr
vectExpr (_, AnnType ty)
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  = liftM vType (vectType ty)
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vectExpr (_, AnnVar v) = vectVar v
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vectExpr (_, AnnLit lit) = vectLiteral lit
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vectExpr (_, AnnNote note expr)
  = liftM (vNote note) (vectExpr expr)
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vectExpr e@(_, AnnApp _ arg)
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  | isAnnTypeArg arg
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  = vectTyAppExpr fn tys
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  where
    (fn, tys) = collectAnnTypeArgs e
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vectExpr (_, AnnApp (_, AnnVar v) (_, AnnLit lit))
  | Just con <- isDataConId_maybe v
  , is_special_con con
  = do
      let vexpr = App (Var v) (Lit lit)
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      lexpr <- liftPD vexpr
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      return (vexpr, lexpr)
  where
    is_special_con con = con `elem` [intDataCon, floatDataCon, doubleDataCon]
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vectExpr (_, AnnApp fn arg)
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  = do
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      arg_ty' <- vectType arg_ty
      res_ty' <- vectType res_ty
      fn'     <- vectExpr fn
      arg'    <- vectExpr arg
      mkClosureApp arg_ty' res_ty' fn' arg'
  where
    (arg_ty, res_ty) = splitFunTy . exprType $ deAnnotate fn
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vectExpr (_, AnnCase scrut bndr ty alts)
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  | Just (tycon, ty_args) <- splitTyConApp_maybe scrut_ty
  , isAlgTyCon tycon
  = vectAlgCase tycon ty_args scrut bndr ty alts
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  where
    scrut_ty = exprType (deAnnotate scrut)

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vectExpr (_, AnnLet (AnnNonRec bndr rhs) body)
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  = do
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      vrhs <- localV . inBind bndr $ vectPolyExpr rhs
      (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
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      return $ vLet (vNonRec vbndr vrhs) vbody
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vectExpr (_, AnnLet (AnnRec bs) body)
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  = do
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      (vbndrs, (vrhss, vbody)) <- vectBndrsIn bndrs
                                $ liftM2 (,)
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                                  (zipWithM vect_rhs bndrs rhss)
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                                  (vectPolyExpr body)
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      return $ vLet (vRec vbndrs vrhss) vbody
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  where
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    (bndrs, rhss) = unzip bs
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    vect_rhs bndr rhs = localV
                      . inBind bndr
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                      $ vectExpr rhs
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vectExpr e@(_, AnnLam bndr _)
  | isId bndr = vectFnExpr True e
{-
onlyIfV (isEmptyVarSet fvs) (vectScalarLam bs $ deAnnotate body)
                `orElseV` vectLam True fvs bs body
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  where
    (bs,body) = collectAnnValBinders e
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-}
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vectExpr e = cantVectorise "Can't vectorise expression" (ppr $ deAnnotate e)
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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


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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
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            lclo <- liftPD (Var clo_var)
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            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
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    is_scalar _ e@(Lit _)    = is_scalar_ty $ exprType e
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    is_scalar vs (App e1 e2) = is_scalar vs e1 && is_scalar vs e2
    is_scalar _ _            = False

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vectLam :: Bool -> VarSet -> [Var] -> CoreExprWithFVs -> VM VExpr
vectLam inline fvs bs body
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  = do
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      tyvars <- localTyVars
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      (vs, vvs) <- readLEnv $ \env ->
                   unzip [(var, vv) | var <- varSetElems fvs
                                    , Just vv <- [lookupVarEnv (local_vars env) var]]
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      arg_tys <- mapM (vectType . idType) bs
      res_ty  <- vectType (exprType $ deAnnotate body)

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      buildClosures tyvars vvs arg_tys res_ty
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        . hoistPolyVExpr tyvars
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        $ do
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            lc <- builtin liftingContext
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            (vbndrs, vbody) <- vectBndrsIn (vs ++ bs)
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                                           (vectExpr body)
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            return . maybe_inline $ vLams lc vbndrs vbody
  where
    maybe_inline = if inline then vInlineMe else id
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vectTyAppExpr :: CoreExprWithFVs -> [Type] -> VM VExpr
vectTyAppExpr (_, AnnVar v) tys = vectPolyVar v tys
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vectTyAppExpr e tys = cantVectorise "Can't vectorise expression"
                        (ppr $ deAnnotate e `mkTyApps` tys)
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-- We convert
--
--   case e :: t of v { ... }
--
-- to
--
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--   V:    let v' = e in case v' of _ { ... }
--   L:    let v' = e in case v' `cast` ... of _ { ... }
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--
-- When lifting, we have to do it this way because v must have the type
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-- [:V(T):] but the scrutinee must be cast to the representation type. We also
-- have to handle the case where v is a wild var correctly.
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--
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-- FIXME: this is too lazy
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vectAlgCase :: TyCon -> [Type] -> CoreExprWithFVs -> Var -> Type
            -> [(AltCon, [Var], CoreExprWithFVs)]
            -> VM VExpr
vectAlgCase _tycon _ty_args scrut bndr ty [(DEFAULT, [], body)]
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  = do
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      vscrut         <- vectExpr scrut
      (vty, lty)     <- vectAndLiftType ty
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      (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
      return $ vCaseDEFAULT vscrut vbndr vty lty vbody

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vectAlgCase _tycon _ty_args scrut bndr ty [(DataAlt _, [], body)]
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  = do
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      vscrut         <- vectExpr scrut
      (vty, lty)     <- vectAndLiftType ty
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      (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
      return $ vCaseDEFAULT vscrut vbndr vty lty vbody

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vectAlgCase _tycon _ty_args scrut bndr ty [(DataAlt dc, bndrs, body)]
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  = do
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      (vty, lty) <- vectAndLiftType ty
      vexpr      <- vectExpr scrut
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      (vbndr, (vbndrs, (vect_body, lift_body)))
         <- vect_scrut_bndr
          . vectBndrsIn bndrs
          $ vectExpr body
      let (vect_bndrs, lift_bndrs) = unzip vbndrs
      (vscrut, lscrut, pdata_tc, _arg_tys) <- mkVScrut (vVar vbndr)
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      vect_dc <- maybeV (lookupDataCon dc)
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      let [pdata_dc] = tyConDataCons pdata_tc

      let vcase = mk_wild_case vscrut vty vect_dc  vect_bndrs vect_body
          lcase = mk_wild_case lscrut lty pdata_dc lift_bndrs lift_body

      return $ vLet (vNonRec vbndr vexpr) (vcase, lcase)
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  where
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    vect_scrut_bndr | isDeadBinder bndr = vectBndrNewIn bndr (fsLit "scrut")
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                    | otherwise         = vectBndrIn bndr

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    mk_wild_case expr ty dc bndrs body
      = mkWildCase expr (exprType expr) ty [(DataAlt dc, bndrs, body)]

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vectAlgCase tycon _ty_args scrut bndr ty alts
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  = do
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      vect_tc     <- maybeV (lookupTyCon tycon)
      (vty, lty)  <- vectAndLiftType ty
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      let arity = length (tyConDataCons vect_tc)
      sel_ty <- builtin (selTy arity)
      sel_bndr <- newLocalVar (fsLit "sel") sel_ty
      let sel = Var sel_bndr

      (vbndr, valts) <- vect_scrut_bndr
                      $ mapM (proc_alt arity sel vty lty) alts'
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      let (vect_dcs, vect_bndrss, lift_bndrss, vbodies) = unzip4 valts

      vexpr <- vectExpr scrut
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      (vect_scrut, lift_scrut, pdata_tc, _arg_tys) <- mkVScrut (vVar vbndr)
      let [pdata_dc] = tyConDataCons pdata_tc
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      let (vect_bodies, lift_bodies) = unzip vbodies
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      vdummy <- newDummyVar (exprType vect_scrut)
      ldummy <- newDummyVar (exprType lift_scrut)
      let vect_case = Case vect_scrut vdummy vty
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                           (zipWith3 mk_vect_alt vect_dcs vect_bndrss vect_bodies)

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      lc <- builtin liftingContext
      lbody <- combinePD vty (Var lc) sel lift_bodies
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      let lift_case = Case lift_scrut ldummy lty
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                           [(DataAlt pdata_dc, sel_bndr : concat lift_bndrss,
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                             lbody)]

      return . vLet (vNonRec vbndr vexpr)
             $ (vect_case, lift_case)
  where
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    vect_scrut_bndr | isDeadBinder bndr = vectBndrNewIn bndr (fsLit "scrut")
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                    | otherwise         = vectBndrIn bndr

    alts' = sortBy (\(alt1, _, _) (alt2, _, _) -> cmp alt1 alt2) alts

    cmp (DataAlt dc1) (DataAlt dc2) = dataConTag dc1 `compare` dataConTag dc2
    cmp DEFAULT       DEFAULT       = EQ
    cmp DEFAULT       _             = LT
    cmp _             DEFAULT       = GT
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    cmp _             _             = panic "vectAlgCase/cmp"
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    proc_alt arity sel vty lty (DataAlt dc, bndrs, body)
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      = do
          vect_dc <- maybeV (lookupDataCon dc)
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          let ntag = dataConTagZ vect_dc
              tag  = mkDataConTag vect_dc
              fvs  = freeVarsOf body `delVarSetList` bndrs

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          sel_tags  <- liftM (`App` sel) (builtin (selTags arity))
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          lc        <- builtin liftingContext
          elems     <- builtin (selElements arity ntag)

          (vbndrs, vbody)
            <- vectBndrsIn bndrs
             . localV
             $ do
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                 binds    <- mapM (pack_var (Var lc) sel_tags tag)
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                           . filter isLocalId
                           $ varSetElems fvs
                 (ve, le) <- vectExpr body
                 return (ve, Case (elems `App` sel) lc lty
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                             [(DEFAULT, [], (mkLets (concat binds) le))])
                 -- empty    <- emptyPD vty
                 -- return (ve, Case (elems `App` sel) lc lty
                 --             [(DEFAULT, [], Let (NonRec flags_var flags_expr)
                 --                             $ mkLets (concat binds) le),
                 --               (LitAlt (mkMachInt 0), [], empty)])
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          let (vect_bndrs, lift_bndrs) = unzip vbndrs
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          return (vect_dc, vect_bndrs, lift_bndrs, vbody)

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    proc_alt _ _ _ _ _ = panic "vectAlgCase/proc_alt"
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    mk_vect_alt vect_dc bndrs body = (DataAlt vect_dc, bndrs, body)

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    pack_var len tags t v
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      = do
          r <- lookupVar v
          case r of
            Local (vv, lv) ->
              do
                lv'  <- cloneVar lv
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                expr <- packByTagPD (idType vv) (Var lv) len tags t
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                updLEnv (\env -> env { local_vars = extendVarEnv
                                                (local_vars env) v (vv, lv') })
                return [(NonRec lv' expr)]

            _ -> return []
490