+{-# OPTIONS -fno-warn-missing-signatures -fno-warn-unused-do-bind #-}
-module Vectorise( vectorise )
+module Vectorise ( vectorise )
where
-import VectMonad
-import VectUtils
-import VectType
-import VectCore
+import Vectorise.Type.Env
+import Vectorise.Type.Type
+import Vectorise.Convert
+import Vectorise.Utils.Hoisting
+import Vectorise.Exp
+import Vectorise.Vect
+import Vectorise.Env
+import Vectorise.Monad
import HscTypes hiding ( MonadThings(..) )
-
-import Module ( PackageId )
-import CoreSyn
-import CoreUtils
-import CoreUnfold ( mkInlineRule )
-import MkCore ( mkWildCase )
+import CoreUnfold ( mkInlineUnfolding )
import CoreFVs
+import PprCore
+import CoreSyn
import CoreMonad ( CoreM, getHscEnv )
-import DataCon
-import TyCon
import Type
-import FamInstEnv ( extendFamInstEnvList )
-import Var
-import VarEnv
-import VarSet
import Id
import OccName
+import DynFlags
import BasicTypes ( isLoopBreaker )
-
-import Literal ( Literal, mkMachInt )
-import TysWiredIn
-import TysPrim ( intPrimTy )
-
import Outputable
-import FastString
import Util ( zipLazy )
+import MonadUtils
+
import Control.Monad
-import Data.List ( sortBy, unzip4 )
-vectorise :: PackageId -> ModGuts -> CoreM ModGuts
-vectorise backend guts = do
- hsc_env <- getHscEnv
- liftIO $ vectoriseIO backend hsc_env guts
--- | Vectorise a single monad, given its HscEnv (code gen environment).
-vectoriseIO :: PackageId -> HscEnv -> ModGuts -> IO ModGuts
-vectoriseIO backend hsc_env guts
- = do -- Get information about currently loaded external packages.
- eps <- hscEPS hsc_env
+-- | Vectorise a single module.
+--
+vectorise :: ModGuts -> CoreM ModGuts
+vectorise guts
+ = do { hsc_env <- getHscEnv
+ ; liftIO $ vectoriseIO hsc_env guts
+ }
- -- Combine vectorisation info from the current module, and external ones.
- let info = hptVectInfo hsc_env `plusVectInfo` eps_vect_info eps
+-- | Vectorise a single monad, given the dynamic compiler flags and HscEnv.
+--
+vectoriseIO :: HscEnv -> ModGuts -> IO ModGuts
+vectoriseIO hsc_env guts
+ = do { -- Get information about currently loaded external packages.
+ ; eps <- hscEPS hsc_env
- -- Run the main VM computation.
- Just (info', guts') <- initV backend hsc_env guts info (vectModule guts)
- return (guts' { mg_vect_info = info' })
+ -- Combine vectorisation info from the current module, and external ones.
+ ; let info = hptVectInfo hsc_env `plusVectInfo` eps_vect_info eps
+ -- Run the main VM computation.
+ ; Just (info', guts') <- initV hsc_env guts info (vectModule guts)
+ ; return (guts' { mg_vect_info = info' })
+ }
-- | Vectorise a single module, in the VM monad.
+--
vectModule :: ModGuts -> VM ModGuts
-vectModule guts
- = do -- Vectorise the type environment.
- -- This may add new TyCons and DataCons.
- -- TODO: What new binds do we get back here?
- (types', fam_insts, tc_binds) <- vectTypeEnv (mg_types guts)
+vectModule guts@(ModGuts { mg_types = types
+ , mg_binds = binds
+ , mg_fam_insts = fam_insts
+ })
+ = do { dumpOptVt Opt_D_dump_vt_trace "Before vectorisation" $
+ pprCoreBindings binds
+
+ -- Vectorise the type environment.
+ -- This may add new TyCons and DataCons.
+ ; (types', new_fam_insts, tc_binds) <- vectTypeEnv types
- -- TODO: What is this?
- let fam_inst_env' = extendFamInstEnvList (mg_fam_inst_env guts) fam_insts
- updGEnv (setFamInstEnv fam_inst_env')
+ ; (_, fam_inst_env) <- readGEnv global_fam_inst_env
-- dicts <- mapM buildPADict pa_insts
-- workers <- mapM vectDataConWorkers pa_insts
- -- Vectorise all the top level bindings.
- binds' <- mapM vectTopBind (mg_binds guts)
-
- return $ guts { mg_types = types'
- , mg_binds = Rec tc_binds : binds'
- , mg_fam_inst_env = fam_inst_env'
- , mg_fam_insts = mg_fam_insts guts ++ fam_insts
- }
+ -- Vectorise all the top level bindings.
+ ; binds' <- mapM vectTopBind binds
+ ; return $ guts { mg_types = types'
+ , mg_binds = Rec tc_binds : binds'
+ , mg_fam_inst_env = fam_inst_env
+ , mg_fam_insts = fam_insts ++ new_fam_insts
+ }
+ }
-- | Try to vectorise a top-level binding.
-- If it doesn't vectorise then return it unharmed.
--
vectTopBind :: CoreBind -> VM CoreBind
vectTopBind b@(NonRec var expr)
- = do
- (inline, expr') <- vectTopRhs var expr
- var' <- vectTopBinder var inline expr'
-
- -- Vectorising the body may create other top-level bindings.
- hs <- takeHoisted
-
- -- To get the same functionality as the original body we project
- -- out its vectorised version from the closure.
- cexpr <- tryConvert var var' expr
-
- return . Rec $ (var, cexpr) : (var', expr') : hs
+ = do { -- Vectorise the right-hand side, create an appropriate top-level binding and add it to
+ -- the vectorisation map.
+ ; (inline, isScalar, expr') <- vectTopRhs [] var expr
+ ; var' <- vectTopBinder var inline expr'
+ ; when isScalar $
+ addGlobalScalar var
+
+ -- We replace the original top-level binding by a value projected from the vectorised
+ -- closure and add any newly created hoisted top-level bindings.
+ ; cexpr <- tryConvert var var' expr
+ ; hs <- takeHoisted
+ ; return . Rec $ (var, cexpr) : (var', expr') : hs
+ }
`orElseV`
return b
-
vectTopBind b@(Rec bs)
- = do
- (vars', _, exprs')
- <- fixV $ \ ~(_, inlines, rhss) ->
- do vars' <- sequence [vectTopBinder var inline rhs
- | (var, ~(inline, rhs)) <- zipLazy vars (zip inlines rhss)]
- (inlines', exprs')
- <- mapAndUnzipM (uncurry vectTopRhs) bs
-
- return (vars', inlines', exprs')
-
- hs <- takeHoisted
- cexprs <- sequence $ zipWith3 tryConvert vars vars' exprs
- return . Rec $ zip vars cexprs ++ zip vars' exprs' ++ hs
+ = let (vars, exprs) = unzip bs
+ in
+ do { (vars', _, exprs', hs) <- fixV $
+ \ ~(_, inlines, rhss, _) ->
+ do { -- Vectorise the right-hand sides, create an appropriate top-level bindings and
+ -- add them to the vectorisation map.
+ ; vars' <- sequence [vectTopBinder var inline rhs
+ | (var, ~(inline, rhs)) <- zipLazy vars (zip inlines rhss)]
+ ; (inlines, areScalars, exprs') <- mapAndUnzip3M (uncurry $ vectTopRhs vars) bs
+ ; hs <- takeHoisted
+ ; if and areScalars
+ then -- (1) Entire recursive group is scalar
+ -- => add all variables to the global set of scalars
+ do { mapM addGlobalScalar vars
+ ; return (vars', inlines, exprs', hs)
+ }
+ else -- (2) At least one binding is not scalar
+ -- => vectorise again with empty set of local scalars
+ do { (inlines, _, exprs') <- mapAndUnzip3M (uncurry $ vectTopRhs []) bs
+ ; hs <- takeHoisted
+ ; return (vars', inlines, exprs', hs)
+ }
+ }
+
+ -- Replace the original top-level bindings by a values projected from the vectorised
+ -- closures and add any newly created hoisted top-level bindings to the group.
+ ; cexprs <- sequence $ zipWith3 tryConvert vars vars' exprs
+ ; return . Rec $ zip vars cexprs ++ zip vars' exprs' ++ hs
+ }
`orElseV`
- return b
- where
- (vars, exprs) = unzip bs
-
-
+ return b
+
-- | Make the vectorised version of this top level binder, and add the mapping
-- between it and the original to the state. For some binder @foo@ the vectorised
-- version is @$v_foo@
--
-- NOTE: vectTopBinder *MUST* be lazy in inline and expr because of how it is
-- used inside of fixV in vectTopBind
-vectTopBinder
- :: Var -- ^ Name of the binding.
- -> Inline -- ^ Whether it should be inlined, used to annotate it.
- -> CoreExpr -- ^ RHS of the binding, used to set the `Unfolding` of the returned `Var`.
- -> VM Var -- ^ Name of the vectorised binding.
-
+--
+vectTopBinder :: Var -- ^ Name of the binding.
+ -> Inline -- ^ Whether it should be inlined, used to annotate it.
+ -> CoreExpr -- ^ RHS of binding, used to set the 'Unfolding' of the returned 'Var'.
+ -> VM Var -- ^ Name of the vectorised binding.
vectTopBinder var inline expr
- = do
- -- Vectorise the type attached to the var.
- vty <- vectType (idType var)
- var' <- liftM (`setIdUnfolding` unfolding) $ cloneId mkVectOcc var vty
- defGlobalVar var var'
- return var'
+ = do { -- Vectorise the type attached to the var.
+ ; vty <- vectType (idType var)
+
+ -- If there is a vectorisation declartion for this binding, make sure that its type
+ -- matches
+ ; vectDecl <- lookupVectDecl var
+ ; case vectDecl of
+ Nothing -> return ()
+ Just (vdty, _)
+ | eqType vty vdty -> return ()
+ | otherwise ->
+ cantVectorise ("Type mismatch in vectorisation pragma for " ++ show var) $
+ (text "Expected type" <+> ppr vty)
+ $$
+ (text "Inferred type" <+> ppr vdty)
+
+ -- Make the vectorised version of binding's name, and set the unfolding used for inlining
+ ; var' <- liftM (`setIdUnfoldingLazily` unfolding)
+ $ cloneId mkVectOcc var vty
+
+ -- Add the mapping between the plain and vectorised name to the state.
+ ; defGlobalVar var var'
+
+ ; return var'
+ }
where
unfolding = case inline of
- Inline arity -> mkInlineRule expr (Just arity)
+ Inline arity -> mkInlineUnfolding (Just arity) expr
DontInline -> noUnfolding
-
-- | Vectorise the RHS of a top-level binding, in an empty local environment.
-vectTopRhs
- :: Var -- ^ Name of the binding.
- -> CoreExpr -- ^ Body of the binding.
- -> VM (Inline, CoreExpr)
-
-vectTopRhs var expr
- = dtrace (vcat [text "vectTopRhs", ppr expr])
- $ closedV
- $ do (inline, vexpr) <- inBind var
- $ vectPolyExpr (isLoopBreaker $ idOccInfo var)
- (freeVars expr)
- return (inline, vectorised vexpr)
-
-
--- | Project out the vectorised version of a binding from some closure,
--- or return the original body if that doesn't work.
-tryConvert
- :: Var -- ^ Name of the original binding (eg @foo@)
- -> Var -- ^ Name of vectorised version of binding (eg @$vfoo@)
- -> CoreExpr -- ^ The original body of the binding.
- -> VM CoreExpr
-
-tryConvert var vect_var rhs
- = fromVect (idType var) (Var vect_var) `orElseV` return rhs
-
--- ----------------------------------------------------------------------------
--- Bindings
-
--- | Vectorise a binder variable, along with its attached type.
-vectBndr :: Var -> VM VVar
-vectBndr v
- = do
- (vty, lty) <- vectAndLiftType (idType v)
- let vv = v `Id.setIdType` vty
- lv = v `Id.setIdType` lty
- updLEnv (mapTo vv lv)
- return (vv, lv)
- where
- mapTo vv lv env = env { local_vars = extendVarEnv (local_vars env) v (vv, lv) }
-
-
--- | Vectorise a binder variable, along with its attached type,
--- but give the result a new name.
-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 }
-
-
--- | Vectorise a binder then run a computation with that binder in scope.
-vectBndrIn :: Var -> VM a -> VM (VVar, a)
-vectBndrIn v p
- = localV
- $ do
- vv <- vectBndr v
- x <- p
- return (vv, x)
-
-
--- | Vectorise a binder, give it a new name, then run a computation with that binder in scope.
-vectBndrNewIn :: Var -> FastString -> VM a -> VM (VVar, a)
-vectBndrNewIn v fs p
- = localV
- $ do
- vv <- vectBndrNew v fs
- x <- p
- return (vv, x)
-
--- | Vectorise some binders, then run a computation with them in scope.
-vectBndrsIn :: [Var] -> VM a -> VM ([VVar], a)
-vectBndrsIn vs p
- = localV
- $ do
- vvs <- mapM vectBndr vs
- x <- p
- return (vvs, x)
-
-
--- ----------------------------------------------------------------------------
--- Expressions
-
--- | Vectorise a variable, producing the vectorised and lifted versions.
-vectVar :: Var -> VM VExpr
-vectVar v
- = do
- -- lookup the variable from the environment.
- r <- lookupVar v
-
- case r of
- Local (vv,lv) -> return (Var vv, Var lv)
- Global vv -> do
- let vexpr = Var vv
- lexpr <- liftPD vexpr
- return (vexpr, lexpr)
-
--- | Like `vectVar` but also add type applications to the variables.
-vectPolyVar :: Var -> [Type] -> VM VExpr
-vectPolyVar v tys
- = do
- vtys <- mapM vectType tys
- r <- lookupVar v
- case r of
- Local (vv, lv)
- -> liftM2 (,) (polyApply (Var vv) vtys)
- (polyApply (Var lv) vtys)
-
- Global poly
- -> do vexpr <- polyApply (Var poly) vtys
- lexpr <- liftPD vexpr
- return (vexpr, lexpr)
-
-
--- | Lifted literals are created by replicating them.
-vectLiteral :: Literal -> VM VExpr
-vectLiteral lit
- = do
- lexpr <- liftPD (Lit lit)
- return (Lit lit, lexpr)
-
-
--- | 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 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)
- = 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 or Double.
-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
-
-
-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
- = 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)
-
--- We convert
---
--- case e :: t of v { ... }
--
--- to
+-- We need to distinguish three cases:
--
--- 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.
+-- (1) We have a (non-scalar) vectorisation declaration for the variable (which explicitly provides
+-- vectorised code implemented by the user)
+-- => no automatic vectorisation & instead use the user-supplied code
+--
+-- (2) We have a scalar vectorisation declaration for the variable
+-- => generate vectorised code that uses a scalar 'map'/'zipWith' to lift the computation
+--
+-- (3) There is no vectorisation declaration for the variable
+-- => perform automatic vectorisation of the RHS
--
-
--- 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)
+vectTopRhs :: [Var] -- ^ Names of all functions in the rec block
+ -> Var -- ^ Name of the binding.
+ -> CoreExpr -- ^ Body of the binding.
+ -> VM ( Inline -- (1) inline specification for the binding
+ , Bool -- (2) whether the right-hand side is a scalar computation
+ , CoreExpr) -- (3) the vectorised right-hand side
+vectTopRhs recFs var expr
+ = closedV
+ $ do { traceVt ("vectTopRhs of " ++ show var) $ ppr expr
+
+ ; globalScalar <- isGlobalScalar var
+ ; vectDecl <- lookupVectDecl var
+ ; rhs globalScalar vectDecl
+ }
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 []
+ rhs _globalScalar (Just (_, expr')) -- Case (1)
+ = return (inlineMe, False, expr')
+ rhs True Nothing -- Case (2)
+ = do { expr' <- vectScalarFun True recFs expr
+ ; return (inlineMe, True, vectorised expr')
+ }
+ rhs False Nothing -- Case (3)
+ = do { let fvs = freeVars expr
+ ; (inline, isScalar, vexpr) <- inBind var $
+ vectPolyExpr (isLoopBreaker $ idOccInfo var) recFs fvs
+ ; return (inline, isScalar, vectorised vexpr)
+ }
+-- | Project out the vectorised version of a binding from some closure,
+-- or return the original body if that doesn't work or the binding is scalar.
+--
+tryConvert :: Var -- ^ Name of the original binding (eg @foo@)
+ -> Var -- ^ Name of vectorised version of binding (eg @$vfoo@)
+ -> CoreExpr -- ^ The original body of the binding.
+ -> VM CoreExpr
+tryConvert var vect_var rhs
+ = do { globalScalar <- isGlobalScalar var
+ ; if globalScalar
+ then
+ return rhs
+ else
+ fromVect (idType var) (Var vect_var) `orElseV` return rhs
+ }
projects / ghc-hetmet.git / blobdiff