2 -- | Vectorisation of expressions.
7 import Vectorise.Type.Type
11 import Vectorise.Monad
12 import Vectorise.Builtins
25 import BasicTypes( isLoopBreaker )
35 -- | Vectorise a polymorphic expression.
37 :: Bool -- ^ When vectorising the RHS of a binding, whether that
38 -- binding is a loop breaker.
42 vectPolyExpr loop_breaker (_, AnnNote note expr)
43 = do (inline, expr') <- vectPolyExpr loop_breaker expr
44 return (inline, vNote note expr')
46 vectPolyExpr loop_breaker expr
48 arity <- polyArity tvs
49 polyAbstract tvs $ \args ->
51 (inline, mono') <- vectFnExpr False loop_breaker mono
52 return (addInlineArity inline arity,
53 mapVect (mkLams $ tvs ++ args) mono')
55 (tvs, mono) = collectAnnTypeBinders expr
58 -- | Vectorise an expression.
59 vectExpr :: CoreExprWithFVs -> VM VExpr
60 vectExpr (_, AnnType ty)
61 = liftM vType (vectType ty)
63 vectExpr (_, AnnVar v)
66 vectExpr (_, AnnLit lit)
69 vectExpr (_, AnnNote note expr)
70 = liftM (vNote note) (vectExpr expr)
72 vectExpr e@(_, AnnApp _ arg)
74 = vectTyAppExpr fn tys
76 (fn, tys) = collectAnnTypeArgs e
78 vectExpr (_, AnnApp (_, AnnVar v) (_, AnnLit lit))
79 | Just con <- isDataConId_maybe v
82 let vexpr = App (Var v) (Lit lit)
86 is_special_con con = con `elem` [intDataCon, floatDataCon, doubleDataCon]
89 -- TODO: Avoid using closure application for dictionaries.
90 -- vectExpr (_, AnnApp fn arg)
91 -- | if is application of dictionary
92 -- just use regular app instead of closure app.
94 -- for lifted version.
95 -- do liftPD (sub a dNumber)
96 -- lift the result of the selection, not sub and dNumber seprately.
98 vectExpr (_, AnnApp fn arg)
100 arg_ty' <- vectType arg_ty
101 res_ty' <- vectType res_ty
106 mkClosureApp arg_ty' res_ty' fn' arg'
108 (arg_ty, res_ty) = splitFunTy . exprType $ deAnnotate fn
110 vectExpr (_, AnnCase scrut bndr ty alts)
111 | Just (tycon, ty_args) <- splitTyConApp_maybe scrut_ty
113 = vectAlgCase tycon ty_args scrut bndr ty alts
115 scrut_ty = exprType (deAnnotate scrut)
117 vectExpr (_, AnnLet (AnnNonRec bndr rhs) body)
119 vrhs <- localV . inBind bndr . liftM snd $ vectPolyExpr False rhs
120 (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
121 return $ vLet (vNonRec vbndr vrhs) vbody
123 vectExpr (_, AnnLet (AnnRec bs) body)
125 (vbndrs, (vrhss, vbody)) <- vectBndrsIn bndrs
127 (zipWithM vect_rhs bndrs rhss)
129 return $ vLet (vRec vbndrs vrhss) vbody
131 (bndrs, rhss) = unzip bs
133 vect_rhs bndr rhs = localV
136 $ vectPolyExpr (isLoopBreaker $ idOccInfo bndr) rhs
138 vectExpr e@(_, AnnLam bndr _)
139 | isId bndr = liftM snd $ vectFnExpr True False e
141 onlyIfV (isEmptyVarSet fvs) (vectScalarLam bs $ deAnnotate body)
142 `orElseV` vectLam True fvs bs body
144 (bs,body) = collectAnnValBinders e
147 vectExpr e = cantVectorise "Can't vectorise expression" (ppr $ deAnnotate e)
150 -- | Vectorise an expression with an outer lambda abstraction.
152 :: Bool -- ^ When the RHS of a binding, whether that binding should be inlined.
153 -> Bool -- ^ Whether the binding is a loop breaker.
154 -> CoreExprWithFVs -- ^ Expression to vectorise. Must have an outer `AnnLam`.
155 -> VM (Inline, VExpr)
157 vectFnExpr inline loop_breaker e@(fvs, AnnLam bndr _)
158 | isId bndr = onlyIfV (isEmptyVarSet fvs)
159 (mark DontInline . vectScalarLam bs $ deAnnotate body)
160 `orElseV` mark inlineMe (vectLam inline loop_breaker fvs bs body)
162 (bs,body) = collectAnnValBinders e
164 vectFnExpr _ _ e = mark DontInline $ vectExpr e
166 mark :: Inline -> VM a -> VM (Inline, a)
167 mark b p = do { x <- p; return (b,x) }
170 -- | Vectorise a function where are the args have scalar type,
171 -- that is Int, Float, Double etc.
173 :: [Var] -- ^ Bound variables of function.
174 -> CoreExpr -- ^ Function body.
177 vectScalarLam args body
178 = do scalars <- globalScalars
179 onlyIfV (all is_prim_ty arg_tys
181 && is_scalar (extendVarSetList scalars args) body
182 && uses scalars body)
184 fn_var <- hoistExpr (fsLit "fn") (mkLams args body) DontInline
185 zipf <- zipScalars arg_tys res_ty
186 clo <- scalarClosure arg_tys res_ty (Var fn_var)
187 (zipf `App` Var fn_var)
188 clo_var <- hoistExpr (fsLit "clo") clo DontInline
189 lclo <- liftPD (Var clo_var)
190 return (Var clo_var, lclo)
192 arg_tys = map idType args
193 res_ty = exprType body
196 | Just (tycon, []) <- splitTyConApp_maybe ty
198 || tycon == floatTyCon
199 || tycon == doubleTyCon
203 cantbe_parr_expr expr = not $ maybe_parr_ty $ exprType expr
205 maybe_parr_ty ty = maybe_parr_ty' [] ty
206 maybe_parr_ty' alreadySeen ty
207 | isPArrTyCon tycon = True
208 | isPrimTyCon tycon = False
209 | isAbstractTyCon tycon = True
210 | isFunTyCon tycon || isProductTyCon tycon || isTupleTyCon tycon = any (maybe_parr_ty' alreadySeen) args
211 | isDataTyCon tycon = pprTrace "isDataTyCon" (ppr tycon) $
212 any (maybe_parr_ty' alreadySeen) args ||
213 hasParrDataCon alreadySeen tycon
216 Just (tycon, args) = splitTyConApp_maybe ty
219 hasParrDataCon alreadySeen tycon
220 | tycon `elem` alreadySeen = False
222 any (maybe_parr_ty' $ tycon : alreadySeen) $ concat $ map dataConOrigArgTys $ tyConDataCons tycon
224 -- checks to make sure expression can't contain a non-scalar subexpression. Might err on the side of caution whenever
225 -- an external (non data constructor) variable is used, or anonymous data constructor
226 is_scalar vs e@(Var v)
227 | Just _ <- isDataConId_maybe v = cantbe_parr_expr e
228 | otherwise = cantbe_parr_expr e && (v `elemVarSet` vs)
229 is_scalar _ e@(Lit _) = -- pprTrace "is_scalar Lit" (ppr e) $
232 is_scalar vs e@(App e1 e2) = -- pprTrace "is_scalar App" (ppr e) $
233 cantbe_parr_expr e &&
234 is_scalar vs e1 && is_scalar vs e2
235 is_scalar vs e@(Let (NonRec b letExpr) body)
236 = -- pprTrace "is_scalar Let" (ppr e) $
237 cantbe_parr_expr e &&
238 is_scalar vs letExpr && is_scalar (extendVarSet vs b) body
239 is_scalar vs e@(Let (Rec bnds) body)
240 = let vs' = extendVarSetList vs (map fst bnds)
241 in -- pprTrace "is_scalar Rec" (ppr e) $
242 cantbe_parr_expr e &&
243 all (is_scalar vs') (map snd bnds) && is_scalar vs' body
244 is_scalar vs e@(Case eC eId ty alts)
245 = let vs' = extendVarSet vs eId
246 in -- pprTrace "is_scalar Case" (ppr e) $
247 cantbe_parr_expr e &&
250 (all (is_scalar_alt vs') alts)
252 is_scalar _ e = -- pprTrace "is_scalar other" (ppr e) $
255 is_scalar_alt vs (_, bs, e)
256 = is_scalar (extendVarSetList vs bs) e
258 -- A scalar function has to actually compute something. Without the check,
259 -- we would treat (\(x :: Int) -> x) as a scalar function and lift it to
260 -- (map (\x -> x)) which is very bad. Normal lifting transforms it to
261 -- (\n# x -> x) which is what we want.
262 uses funs (Var v) = v `elemVarSet` funs
263 uses funs (App e1 e2) = uses funs e1 || uses funs e2
264 uses funs (Let (NonRec _b letExpr) body)
265 = uses funs letExpr || uses funs body
266 uses funs (Case e _eId _ty alts)
267 = uses funs e || any (uses_alt funs) alts
270 uses_alt funs (_, _bs, e)
273 -- | Vectorise a lambda abstraction.
275 :: Bool -- ^ When the RHS of a binding, whether that binding should be inlined.
276 -> Bool -- ^ Whether the binding is a loop breaker.
277 -> VarSet -- ^ The free variables in the body.
278 -> [Var] -- ^ Binding variables.
279 -> CoreExprWithFVs -- ^ Body of abstraction.
282 vectLam inline loop_breaker fvs bs body
283 = do tyvars <- localTyVars
284 (vs, vvs) <- readLEnv $ \env ->
285 unzip [(var, vv) | var <- varSetElems fvs
286 , Just vv <- [lookupVarEnv (local_vars env) var]]
288 arg_tys <- mapM (vectType . idType) bs
289 res_ty <- vectType (exprType $ deAnnotate body)
291 buildClosures tyvars vvs arg_tys res_ty
292 . hoistPolyVExpr tyvars (maybe_inline (length vs + length bs))
294 lc <- builtin liftingContext
295 (vbndrs, vbody) <- vectBndrsIn (vs ++ bs) (vectExpr body)
297 vbody' <- break_loop lc res_ty vbody
298 return $ vLams lc vbndrs vbody'
300 maybe_inline n | inline = Inline n
301 | otherwise = DontInline
303 break_loop lc ty (ve, le)
307 lty <- mkPDataType ty
308 return (ve, mkWildCase (Var lc) intPrimTy lty
310 (LitAlt (mkMachInt 0), [], empty)])
312 | otherwise = return (ve, le)
315 vectTyAppExpr :: CoreExprWithFVs -> [Type] -> VM VExpr
316 vectTyAppExpr (_, AnnVar v) tys = vectPolyVar v tys
317 vectTyAppExpr e tys = cantVectorise "Can't vectorise expression"
318 (ppr $ deAnnotate e `mkTyApps` tys)
321 -- | Vectorise an algebraic case expression.
324 -- case e :: t of v { ... }
328 -- V: let v' = e in case v' of _ { ... }
329 -- L: let v' = e in case v' `cast` ... of _ { ... }
331 -- When lifting, we have to do it this way because v must have the type
332 -- [:V(T):] but the scrutinee must be cast to the representation type. We also
333 -- have to handle the case where v is a wild var correctly.
336 -- FIXME: this is too lazy
337 vectAlgCase :: TyCon -> [Type] -> CoreExprWithFVs -> Var -> Type
338 -> [(AltCon, [Var], CoreExprWithFVs)]
340 vectAlgCase _tycon _ty_args scrut bndr ty [(DEFAULT, [], body)]
342 vscrut <- vectExpr scrut
343 (vty, lty) <- vectAndLiftType ty
344 (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
345 return $ vCaseDEFAULT vscrut vbndr vty lty vbody
347 vectAlgCase _tycon _ty_args scrut bndr ty [(DataAlt _, [], body)]
349 vscrut <- vectExpr scrut
350 (vty, lty) <- vectAndLiftType ty
351 (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
352 return $ vCaseDEFAULT vscrut vbndr vty lty vbody
354 vectAlgCase _tycon _ty_args scrut bndr ty [(DataAlt dc, bndrs, body)]
356 (vty, lty) <- vectAndLiftType ty
357 vexpr <- vectExpr scrut
358 (vbndr, (vbndrs, (vect_body, lift_body)))
362 let (vect_bndrs, lift_bndrs) = unzip vbndrs
363 (vscrut, lscrut, pdata_tc, _arg_tys) <- mkVScrut (vVar vbndr)
364 vect_dc <- maybeV (lookupDataCon dc)
365 let [pdata_dc] = tyConDataCons pdata_tc
367 let vcase = mk_wild_case vscrut vty vect_dc vect_bndrs vect_body
368 lcase = mk_wild_case lscrut lty pdata_dc lift_bndrs lift_body
370 return $ vLet (vNonRec vbndr vexpr) (vcase, lcase)
372 vect_scrut_bndr | isDeadBinder bndr = vectBndrNewIn bndr (fsLit "scrut")
373 | otherwise = vectBndrIn bndr
375 mk_wild_case expr ty dc bndrs body
376 = mkWildCase expr (exprType expr) ty [(DataAlt dc, bndrs, body)]
378 vectAlgCase tycon _ty_args scrut bndr ty alts
380 vect_tc <- maybeV (lookupTyCon tycon)
381 (vty, lty) <- vectAndLiftType ty
383 let arity = length (tyConDataCons vect_tc)
384 sel_ty <- builtin (selTy arity)
385 sel_bndr <- newLocalVar (fsLit "sel") sel_ty
386 let sel = Var sel_bndr
388 (vbndr, valts) <- vect_scrut_bndr
389 $ mapM (proc_alt arity sel vty lty) alts'
390 let (vect_dcs, vect_bndrss, lift_bndrss, vbodies) = unzip4 valts
392 vexpr <- vectExpr scrut
393 (vect_scrut, lift_scrut, pdata_tc, _arg_tys) <- mkVScrut (vVar vbndr)
394 let [pdata_dc] = tyConDataCons pdata_tc
396 let (vect_bodies, lift_bodies) = unzip vbodies
398 vdummy <- newDummyVar (exprType vect_scrut)
399 ldummy <- newDummyVar (exprType lift_scrut)
400 let vect_case = Case vect_scrut vdummy vty
401 (zipWith3 mk_vect_alt vect_dcs vect_bndrss vect_bodies)
403 lc <- builtin liftingContext
404 lbody <- combinePD vty (Var lc) sel lift_bodies
405 let lift_case = Case lift_scrut ldummy lty
406 [(DataAlt pdata_dc, sel_bndr : concat lift_bndrss,
409 return . vLet (vNonRec vbndr vexpr)
410 $ (vect_case, lift_case)
412 vect_scrut_bndr | isDeadBinder bndr = vectBndrNewIn bndr (fsLit "scrut")
413 | otherwise = vectBndrIn bndr
415 alts' = sortBy (\(alt1, _, _) (alt2, _, _) -> cmp alt1 alt2) alts
417 cmp (DataAlt dc1) (DataAlt dc2) = dataConTag dc1 `compare` dataConTag dc2
418 cmp DEFAULT DEFAULT = EQ
421 cmp _ _ = panic "vectAlgCase/cmp"
423 proc_alt arity sel _ lty (DataAlt dc, bndrs, body)
425 vect_dc <- maybeV (lookupDataCon dc)
426 let ntag = dataConTagZ vect_dc
427 tag = mkDataConTag vect_dc
428 fvs = freeVarsOf body `delVarSetList` bndrs
430 sel_tags <- liftM (`App` sel) (builtin (selTags arity))
431 lc <- builtin liftingContext
432 elems <- builtin (selElements arity ntag)
438 binds <- mapM (pack_var (Var lc) sel_tags tag)
441 (ve, le) <- vectExpr body
442 return (ve, Case (elems `App` sel) lc lty
443 [(DEFAULT, [], (mkLets (concat binds) le))])
444 -- empty <- emptyPD vty
445 -- return (ve, Case (elems `App` sel) lc lty
446 -- [(DEFAULT, [], Let (NonRec flags_var flags_expr)
447 -- $ mkLets (concat binds) le),
448 -- (LitAlt (mkMachInt 0), [], empty)])
449 let (vect_bndrs, lift_bndrs) = unzip vbndrs
450 return (vect_dc, vect_bndrs, lift_bndrs, vbody)
452 proc_alt _ _ _ _ _ = panic "vectAlgCase/proc_alt"
454 mk_vect_alt vect_dc bndrs body = (DataAlt vect_dc, bndrs, body)
456 pack_var len tags t v
463 expr <- packByTagPD (idType vv) (Var lv) len tags t
464 updLEnv (\env -> env { local_vars = extendVarEnv
465 (local_vars env) v (vv, lv') })
466 return [(NonRec lv' expr)]