where
import VectUtils
-import VectVar
import VectType
+import Vectorise.Exp
import Vectorise.Vect
import Vectorise.Env
import Vectorise.Monad
-import Vectorise.Builtins
import HscTypes hiding ( MonadThings(..) )
-
import Module ( PackageId )
import CoreSyn
-import CoreUtils
import CoreUnfold ( mkInlineRule )
-import MkCore ( mkWildCase )
import CoreFVs
import CoreMonad ( CoreM, getHscEnv )
-import DataCon
-import TyCon
-import Type
import FamInstEnv ( extendFamInstEnvList )
import Var
-import VarEnv
-import VarSet
import Id
import OccName
import BasicTypes ( isLoopBreaker )
-
-import Literal
-import TysWiredIn
-import TysPrim ( intPrimTy )
-
import Outputable
-import FastString
import Util ( zipLazy )
import Control.Monad
-import Data.List ( sortBy, unzip4 )
-
debug = False
dtrace s x = if debug then pprTrace "Vectorise" s x else x
tryConvert var vect_var rhs
= fromVect (idType var) (Var vect_var) `orElseV` return rhs
-
--- ----------------------------------------------------------------------------
--- Expressions
-
-
--- | Vectorise a polymorphic expression
-vectPolyExpr
- :: Bool -- ^ When vectorising the RHS of a binding, whether that
- -- binding is a loop breaker.
- -> CoreExprWithFVs
- -> VM (Inline, VExpr)
-
-vectPolyExpr loop_breaker (_, AnnNote note expr)
- = do (inline, expr') <- vectPolyExpr loop_breaker expr
- return (inline, vNote note expr')
-
-vectPolyExpr loop_breaker expr
- = dtrace (vcat [text "vectPolyExpr", ppr (deAnnotate expr)])
- $ do
- arity <- polyArity tvs
- polyAbstract tvs $ \args ->
- do
- (inline, mono') <- vectFnExpr False loop_breaker mono
- return (addInlineArity inline arity,
- mapVect (mkLams $ tvs ++ args) mono')
- where
- (tvs, mono) = collectAnnTypeBinders expr
-
-
--- | Vectorise a core expression.
-vectExpr :: CoreExprWithFVs -> VM VExpr
-vectExpr (_, AnnType ty)
- = liftM vType (vectType ty)
-
-vectExpr (_, AnnVar v)
- = vectVar v
-
-vectExpr (_, AnnLit lit)
- = vectLiteral lit
-
-vectExpr (_, AnnNote note expr)
- = liftM (vNote note) (vectExpr expr)
-
-vectExpr e@(_, AnnApp _ arg)
- | isAnnTypeArg arg
- = vectTyAppExpr fn tys
- where
- (fn, tys) = collectAnnTypeArgs e
-
-vectExpr (_, AnnApp (_, AnnVar v) (_, AnnLit lit))
- | Just con <- isDataConId_maybe v
- , is_special_con con
- = do
- let vexpr = App (Var v) (Lit lit)
- lexpr <- liftPD vexpr
- return (vexpr, lexpr)
- where
- is_special_con con = con `elem` [intDataCon, floatDataCon, doubleDataCon]
-
-
--- TODO: Avoid using closure application for dictionaries.
--- vectExpr (_, AnnApp fn arg)
--- | if is application of dictionary
--- just use regular app instead of closure app.
-
--- for lifted version.
--- do liftPD (sub a dNumber)
--- lift the result of the selection, not sub and dNumber seprately.
-
-vectExpr (_, AnnApp fn arg)
- = dtrace (text "AnnApp" <+> ppr (deAnnotate fn) <+> ppr (deAnnotate arg))
- $ do
- arg_ty' <- vectType arg_ty
- res_ty' <- vectType res_ty
-
- dtrace (text "vectorising fn " <> ppr (deAnnotate fn)) $ return ()
- fn' <- vectExpr fn
- dtrace (text "fn' = " <> ppr fn') $ return ()
-
- arg' <- vectExpr arg
-
- mkClosureApp arg_ty' res_ty' fn' arg'
- where
- (arg_ty, res_ty) = splitFunTy . exprType $ deAnnotate fn
-
-vectExpr (_, AnnCase scrut bndr ty alts)
- | Just (tycon, ty_args) <- splitTyConApp_maybe scrut_ty
- , isAlgTyCon tycon
- = vectAlgCase tycon ty_args scrut bndr ty alts
- where
- scrut_ty = exprType (deAnnotate scrut)
-
-vectExpr (_, AnnLet (AnnNonRec bndr rhs) body)
- = do
- vrhs <- localV . inBind bndr . liftM snd $ vectPolyExpr False rhs
- (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
- return $ vLet (vNonRec vbndr vrhs) vbody
-
-vectExpr (_, AnnLet (AnnRec bs) body)
- = do
- (vbndrs, (vrhss, vbody)) <- vectBndrsIn bndrs
- $ liftM2 (,)
- (zipWithM vect_rhs bndrs rhss)
- (vectExpr body)
- return $ vLet (vRec vbndrs vrhss) vbody
- where
- (bndrs, rhss) = unzip bs
-
- vect_rhs bndr rhs = localV
- . inBind bndr
- . liftM snd
- $ vectPolyExpr (isLoopBreaker $ idOccInfo bndr) rhs
-
-vectExpr e@(_, AnnLam bndr _)
- | isId bndr = liftM snd $ vectFnExpr True False 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)
-
-
--- | Vectorise an expression with an outer lambda abstraction.
-vectFnExpr
- :: Bool -- ^ When the RHS of a binding, whether that binding should be inlined.
- -> Bool -- ^ Whether the binding is a loop breaker.
- -> CoreExprWithFVs -- ^ Expression to vectorise. Must have an outer `AnnLam`.
- -> VM (Inline, VExpr)
-
-vectFnExpr inline loop_breaker e@(fvs, AnnLam bndr _)
- | isId bndr = onlyIfV (isEmptyVarSet fvs)
- (mark DontInline . vectScalarLam bs $ deAnnotate body)
- `orElseV` mark inlineMe (vectLam inline loop_breaker fvs bs body)
- where
- (bs,body) = collectAnnValBinders e
-
-vectFnExpr _ _ e = mark DontInline $ vectExpr e
-
-mark :: Inline -> VM a -> VM (Inline, a)
-mark b p = do { x <- p; return (b,x) }
-
-
--- | Vectorise a function where are the args have scalar type, that is Int, Float or Double.
-vectScalarLam
- :: [Var] -- ^ Bound variables of function.
- -> CoreExpr -- ^ Function body.
- -> VM VExpr
-vectScalarLam args body
- = dtrace (vcat [text "vectScalarLam ", ppr args, ppr body])
- $ do scalars <- globalScalars
- onlyIfV (all is_scalar_ty arg_tys
- && is_scalar_ty res_ty
- && is_scalar (extendVarSetList scalars args) body
- && uses scalars body)
- $ do
- fn_var <- hoistExpr (fsLit "fn") (mkLams args body) DontInline
- 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 DontInline
- lclo <- liftPD (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
-
- -- A scalar function has to actually compute something. Without the check,
- -- we would treat (\(x :: Int) -> x) as a scalar function and lift it to
- -- (map (\x -> x)) which is very bad. Normal lifting transforms it to
- -- (\n# x -> x) which is what we want.
- uses funs (Var v) = v `elemVarSet` funs
- uses funs (App e1 e2) = uses funs e1 || uses funs e2
- uses _ _ = False
-
-
-vectLam
- :: Bool -- ^ When the RHS of a binding, whether that binding should be inlined.
- -> Bool -- ^ Whether the binding is a loop breaker.
- -> VarSet -- ^ The free variables in the body.
- -> [Var] --
- -> CoreExprWithFVs
- -> VM VExpr
-
-vectLam inline loop_breaker fvs bs body
- = dtrace (vcat [ text "vectLam "
- , text "free vars = " <> ppr fvs
- , text "binding vars = " <> ppr bs
- , text "body = " <> ppr (deAnnotate body)])
-
- $ do tyvars <- localTyVars
- (vs, vvs) <- readLEnv $ \env ->
- unzip [(var, vv) | var <- varSetElems fvs
- , Just vv <- [lookupVarEnv (local_vars env) var]]
-
- arg_tys <- mapM (vectType . idType) bs
-
- dtrace (text "arg_tys = " <> ppr arg_tys) $ return ()
-
- res_ty <- vectType (exprType $ deAnnotate body)
-
- dtrace (text "res_ty = " <> ppr res_ty) $ return ()
-
- buildClosures tyvars vvs arg_tys res_ty
- . hoistPolyVExpr tyvars (maybe_inline (length vs + length bs))
- $ do
- lc <- builtin liftingContext
- (vbndrs, vbody) <- vectBndrsIn (vs ++ bs) (vectExpr body)
-
- dtrace (text "vbody = " <> ppr vbody) $ return ()
-
- vbody' <- break_loop lc res_ty vbody
- return $ vLams lc vbndrs vbody'
- where
- maybe_inline n | inline = Inline n
- | otherwise = DontInline
-
- break_loop lc ty (ve, le)
- | loop_breaker
- = do
- empty <- emptyPD ty
- lty <- mkPDataType ty
- return (ve, mkWildCase (Var lc) intPrimTy lty
- [(DEFAULT, [], le),
- (LitAlt (mkMachInt 0), [], empty)])
-
- | otherwise = return (ve, le)
-
-
-vectTyAppExpr :: CoreExprWithFVs -> [Type] -> VM VExpr
-vectTyAppExpr (_, AnnVar v) tys = vectPolyVar v tys
-vectTyAppExpr e tys = cantVectorise "Can't vectorise expression"
- (ppr $ deAnnotate e `mkTyApps` tys)
-
--- We convert
---
--- case e :: t of v { ... }
---
--- to
---
--- V: let v' = e in case v' of _ { ... }
--- L: let v' = e in case v' `cast` ... of _ { ... }
---
--- When lifting, we have to do it this way because v must have the type
--- [: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.
---
-
--- FIXME: this is too lazy
-vectAlgCase :: TyCon -> [Type] -> CoreExprWithFVs -> Var -> Type
- -> [(AltCon, [Var], CoreExprWithFVs)]
- -> VM VExpr
-vectAlgCase _tycon _ty_args scrut bndr ty [(DEFAULT, [], body)]
- = do
- vscrut <- vectExpr scrut
- (vty, lty) <- vectAndLiftType ty
- (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
- return $ vCaseDEFAULT vscrut vbndr vty lty vbody
-
-vectAlgCase _tycon _ty_args scrut bndr ty [(DataAlt _, [], body)]
- = do
- vscrut <- vectExpr scrut
- (vty, lty) <- vectAndLiftType ty
- (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
- return $ vCaseDEFAULT vscrut vbndr vty lty vbody
-
-vectAlgCase _tycon _ty_args scrut bndr ty [(DataAlt dc, bndrs, body)]
- = do
- (vty, lty) <- vectAndLiftType ty
- vexpr <- vectExpr scrut
- (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)
- vect_dc <- maybeV (lookupDataCon dc)
- 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)
- where
- vect_scrut_bndr | isDeadBinder bndr = vectBndrNewIn bndr (fsLit "scrut")
- | otherwise = vectBndrIn bndr
-
- mk_wild_case expr ty dc bndrs body
- = mkWildCase expr (exprType expr) ty [(DataAlt dc, bndrs, body)]
-
-vectAlgCase tycon _ty_args scrut bndr ty alts
- = do
- vect_tc <- maybeV (lookupTyCon tycon)
- (vty, lty) <- vectAndLiftType ty
-
- 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'
- let (vect_dcs, vect_bndrss, lift_bndrss, vbodies) = unzip4 valts
-
- vexpr <- vectExpr scrut
- (vect_scrut, lift_scrut, pdata_tc, _arg_tys) <- mkVScrut (vVar vbndr)
- let [pdata_dc] = tyConDataCons pdata_tc
-
- let (vect_bodies, lift_bodies) = unzip vbodies
-
- 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)
-
- lc <- builtin liftingContext
- lbody <- combinePD vty (Var lc) sel lift_bodies
- let lift_case = Case lift_scrut ldummy lty
- [(DataAlt pdata_dc, sel_bndr : concat lift_bndrss,
- lbody)]
-
- return . vLet (vNonRec vbndr vexpr)
- $ (vect_case, lift_case)
- where
- vect_scrut_bndr | isDeadBinder bndr = vectBndrNewIn bndr (fsLit "scrut")
- | 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
- cmp _ _ = panic "vectAlgCase/cmp"
-
- proc_alt arity sel _ lty (DataAlt dc, bndrs, body)
- = do
- vect_dc <- maybeV (lookupDataCon dc)
- let ntag = dataConTagZ vect_dc
- tag = mkDataConTag vect_dc
- fvs = freeVarsOf body `delVarSetList` bndrs
-
- sel_tags <- liftM (`App` sel) (builtin (selTags arity))
- lc <- builtin liftingContext
- elems <- builtin (selElements arity ntag)
-
- (vbndrs, vbody)
- <- vectBndrsIn bndrs
- . localV
- $ do
- binds <- mapM (pack_var (Var lc) sel_tags tag)
- . filter isLocalId
- $ varSetElems fvs
- (ve, le) <- vectExpr body
- return (ve, Case (elems `App` sel) lc lty
- [(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)])
- let (vect_bndrs, lift_bndrs) = unzip vbndrs
- return (vect_dc, vect_bndrs, lift_bndrs, vbody)
-
- proc_alt _ _ _ _ _ = panic "vectAlgCase/proc_alt"
-
- mk_vect_alt vect_dc bndrs body = (DataAlt vect_dc, bndrs, body)
-
- pack_var len tags t v
- = do
- r <- lookupVar v
- case r of
- Local (vv, lv) ->
- do
- lv' <- cloneVar lv
- expr <- packByTagPD (idType vv) (Var lv) len tags t
- updLEnv (\env -> env { local_vars = extendVarEnv
- (local_vars env) v (vv, lv') })
- return [(NonRec lv' expr)]
-
- _ -> return []
-
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