--- /dev/null
+
+-- | Vectorisation of expressions.
+module Vectorise.Exp
+ (vectPolyExpr)
+where
+import VectUtils
+import VectVar
+import VectType
+import Vectorise.Vect
+import Vectorise.Env
+import Vectorise.Monad
+import Vectorise.Builtins
+
+import CoreSyn
+import CoreUtils
+import MkCore
+import CoreFVs
+import DataCon
+import TyCon
+import Type
+import Var
+import VarEnv
+import VarSet
+import Id
+import BasicTypes
+import Literal
+import TysWiredIn
+import TysPrim
+import Outputable
+import FastString
+import Control.Monad
+import Data.List
+
+
+-- | 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
+ = 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 an 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)
+ = do
+ 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
+
+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, Double etc.
+vectScalarLam
+ :: [Var] -- ^ Bound variables of function.
+ -> CoreExpr -- ^ Function body.
+ -> 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
+ && 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
+
+
+-- | Vectorise a lambda abstraction.
+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] -- ^ Binding variables.
+ -> CoreExprWithFVs -- ^ Body of abstraction.
+ -> VM VExpr
+
+vectLam inline loop_breaker fvs bs 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
+ res_ty <- vectType (exprType $ deAnnotate body)
+
+ 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)
+
+ 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)
+
+
+-- | Vectorise an algebraic case expression.
+-- 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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