#include "HsVersions.h"
+import VectMonad
+import VectUtils
+import VectType
+import VectCore
+
import DynFlags
import HscTypes
import CoreSyn
import CoreUtils
import CoreFVs
+import SimplMonad ( SimplCount, zeroSimplCount )
+import Rules ( RuleBase )
+import DataCon
import TyCon
import Type
-import TypeRep
+import FamInstEnv ( extendFamInstEnvList )
+import InstEnv ( extendInstEnvList )
import Var
import VarEnv
-import Name ( mkSysTvName )
+import VarSet
+import Name ( Name, mkSysTvName, getName )
import NameEnv
import Id
+import MkId ( unwrapFamInstScrut )
+import OccName
+import Module ( Module )
import DsMonad hiding (mapAndUnzipM)
+import DsUtils ( mkCoreTup, mkCoreTupTy )
+import Literal ( Literal )
import PrelNames
+import TysWiredIn
+import TysPrim ( intPrimTy )
+import BasicTypes ( Boxity(..) )
import Outputable
import FastString
-import Control.Monad ( liftM, liftM2, mapAndUnzipM )
+import Control.Monad ( liftM, liftM2, zipWithM, mapAndUnzipM )
-vectorise :: HscEnv -> ModGuts -> IO ModGuts
-vectorise hsc_env guts
- | not (Opt_Vectorise `dopt` dflags) = return guts
- | otherwise
+vectorise :: HscEnv -> UniqSupply -> RuleBase -> ModGuts
+ -> IO (SimplCount, ModGuts)
+vectorise hsc_env _ _ guts
= do
showPass dflags "Vectorisation"
eps <- hscEPS hsc_env
let info = hptVectInfo hsc_env `plusVectInfo` eps_vect_info eps
- Just guts' <- initDs hsc_env (mg_module guts)
- (mg_rdr_env guts)
- (mg_types guts)
- (vectoriseModule info guts)
+ Just (info', guts') <- initV hsc_env guts info (vectModule guts)
endPass dflags "Vectorisation" Opt_D_dump_vect (mg_binds guts')
- return guts'
+ return (zeroSimplCount dflags, guts' { mg_vect_info = info' })
where
dflags = hsc_dflags hsc_env
--- ----------------------------------------------------------------------------
--- Vectorisation monad
-
-data Builtins = Builtins {
- parrayTyCon :: TyCon
- , paTyCon :: TyCon
- , closureTyCon :: TyCon
- , mkClosureVar :: Var
- , applyClosureVar :: Var
- , mkClosurePVar :: Var
- , applyClosurePVar :: Var
- , closurePAVar :: Var
- , lengthPAVar :: Var
- , replicatePAVar :: Var
- }
-
-initBuiltins :: DsM Builtins
-initBuiltins
+vectModule :: ModGuts -> VM ModGuts
+vectModule guts
+ = do
+ (types', fam_insts, tc_binds) <- vectTypeEnv (mg_types guts)
+
+ let fam_inst_env' = extendFamInstEnvList (mg_fam_inst_env guts) fam_insts
+ updGEnv (setFamInstEnv fam_inst_env')
+
+ -- dicts <- mapM buildPADict pa_insts
+ -- workers <- mapM vectDataConWorkers pa_insts
+ 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
+ }
+
+vectTopBind :: CoreBind -> VM CoreBind
+vectTopBind b@(NonRec var expr)
+ = do
+ var' <- vectTopBinder var
+ expr' <- vectTopRhs var expr
+ hs <- takeHoisted
+ return . Rec $ (var, expr) : (var', expr') : hs
+ `orElseV`
+ return b
+
+vectTopBind b@(Rec bs)
= do
- parrayTyCon <- dsLookupTyCon parrayTyConName
- paTyCon <- dsLookupTyCon paTyConName
- closureTyCon <- dsLookupTyCon closureTyConName
-
- mkClosureVar <- dsLookupGlobalId mkClosureName
- applyClosureVar <- dsLookupGlobalId applyClosureName
- mkClosurePVar <- dsLookupGlobalId mkClosurePName
- applyClosurePVar <- dsLookupGlobalId applyClosurePName
- closurePAVar <- dsLookupGlobalId closurePAName
- lengthPAVar <- dsLookupGlobalId lengthPAName
- replicatePAVar <- dsLookupGlobalId replicatePAName
-
- return $ Builtins {
- parrayTyCon = parrayTyCon
- , paTyCon = paTyCon
- , closureTyCon = closureTyCon
- , mkClosureVar = mkClosureVar
- , applyClosureVar = applyClosureVar
- , mkClosurePVar = mkClosurePVar
- , applyClosurePVar = applyClosurePVar
- , closurePAVar = closurePAVar
- , lengthPAVar = lengthPAVar
- , replicatePAVar = replicatePAVar
- }
-
-data GlobalEnv = GlobalEnv {
- -- Mapping from global variables to their vectorised versions.
- --
- global_vars :: VarEnv CoreExpr
-
- -- Exported variables which have a vectorised version
- --
- , global_exported_vars :: VarEnv (Var, Var)
-
- -- Mapping from TyCons to their vectorised versions.
- -- TyCons which do not have to be vectorised are mapped to
- -- themselves.
- --
- , global_tycons :: NameEnv TyCon
-
- -- Mapping from TyCons to their PA dictionaries
- --
- , global_tycon_pa :: NameEnv CoreExpr
- }
-
-data LocalEnv = LocalEnv {
- -- Mapping from local variables to their vectorised and
- -- lifted versions
- --
- local_vars :: VarEnv (CoreExpr, CoreExpr)
-
- -- Mapping from tyvars to their PA dictionaries
- , local_tyvar_pa :: VarEnv CoreExpr
- }
-
-
-initGlobalEnv :: VectInfo -> GlobalEnv
-initGlobalEnv info
- = GlobalEnv {
- global_vars = mapVarEnv (Var . snd) $ vectInfoCCVar info
- , global_exported_vars = emptyVarEnv
- , global_tycons = mapNameEnv snd $ vectInfoCCTyCon info
- , global_tycon_pa = emptyNameEnv
- }
-
-emptyLocalEnv = LocalEnv {
- local_vars = emptyVarEnv
- , local_tyvar_pa = emptyVarEnv
- }
-
--- FIXME
-updVectInfo :: GlobalEnv -> ModGuts -> ModGuts
-updVectInfo env guts = guts { mg_vect_info = info' }
+ vars' <- mapM vectTopBinder vars
+ exprs' <- zipWithM vectTopRhs vars exprs
+ hs <- takeHoisted
+ return . Rec $ bs ++ zip vars' exprs' ++ hs
+ `orElseV`
+ return b
where
- info' = info {
- vectInfoCCVar = global_exported_vars env
- , vectInfoCCTyCon = tc_env
- }
-
- info = mg_vect_info guts
- tyenv = mg_types guts
-
- tc_env = mkNameEnv [(tc_name, (tc,tc')) | tc <- typeEnvTyCons tyenv
- , let tc_name = tyConName tc
- , Just tc' <- [lookupNameEnv (global_tycons env) tc_name]]
-
-data VResult a = Yes GlobalEnv LocalEnv a | No
-
-newtype VM a = VM { runVM :: Builtins -> GlobalEnv -> LocalEnv -> DsM (VResult a) }
-
-instance Monad VM where
- return x = VM $ \bi genv lenv -> return (Yes genv lenv x)
- VM p >>= f = VM $ \bi genv lenv -> do
- r <- p bi genv lenv
- case r of
- Yes genv' lenv' x -> runVM (f x) bi genv' lenv'
- No -> return No
-
-noV :: VM a
-noV = VM $ \_ _ _ -> return No
-
-tryV :: VM a -> VM (Maybe a)
-tryV (VM p) = VM $ \bi genv lenv ->
- do
- r <- p bi genv lenv
- case r of
- Yes genv' lenv' x -> return (Yes genv' lenv' (Just x))
- No -> return (Yes genv lenv Nothing)
-
-maybeV :: VM (Maybe a) -> VM a
-maybeV p = maybe noV return =<< p
-
-orElseV :: VM a -> VM a -> VM a
-orElseV p q = maybe q return =<< tryV p
-
-localV :: VM a -> VM a
-localV p = do
- env <- readLEnv id
- x <- p
- setLEnv env
- return x
-
-liftDs :: DsM a -> VM a
-liftDs p = VM $ \bi genv lenv -> do { x <- p; return (Yes genv lenv x) }
-
-builtin :: (Builtins -> a) -> VM a
-builtin f = VM $ \bi genv lenv -> return (Yes genv lenv (f bi))
-
-readGEnv :: (GlobalEnv -> a) -> VM a
-readGEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f genv))
-
-setGEnv :: GlobalEnv -> VM ()
-setGEnv genv = VM $ \_ _ lenv -> return (Yes genv lenv ())
+ (vars, exprs) = unzip bs
-updGEnv :: (GlobalEnv -> GlobalEnv) -> VM ()
-updGEnv f = VM $ \_ genv lenv -> return (Yes (f genv) lenv ())
-
-readLEnv :: (LocalEnv -> a) -> VM a
-readLEnv f = VM $ \bi genv lenv -> return (Yes genv lenv (f lenv))
-
-setLEnv :: LocalEnv -> VM ()
-setLEnv lenv = VM $ \_ genv _ -> return (Yes genv lenv ())
-
-updLEnv :: (LocalEnv -> LocalEnv) -> VM ()
-updLEnv f = VM $ \_ genv lenv -> return (Yes genv (f lenv) ())
-
-newLocalVar :: FastString -> Type -> VM Var
-newLocalVar fs ty
+vectTopBinder :: Var -> VM Var
+vectTopBinder var
= do
- u <- liftDs newUnique
- return $ mkSysLocal fs u ty
-
-newTyVar :: FastString -> Kind -> VM Var
-newTyVar fs k
+ vty <- vectType (idType var)
+ var' <- cloneId mkVectOcc var vty
+ defGlobalVar var var'
+ return var'
+
+vectTopRhs :: Var -> CoreExpr -> VM CoreExpr
+vectTopRhs var expr
= do
- u <- liftDs newUnique
- return $ mkTyVar (mkSysTvName u fs) k
-
-lookupTyCon :: TyCon -> VM (Maybe TyCon)
-lookupTyCon tc = readGEnv $ \env -> lookupNameEnv (global_tycons env) (tyConName tc)
-
-
-extendTyVarPA :: Var -> CoreExpr -> VM ()
-extendTyVarPA tv pa = updLEnv $ \env -> env { local_tyvar_pa = extendVarEnv (local_tyvar_pa env) tv pa }
+ closedV . liftM vectorised
+ . inBind var
+ $ vectPolyExpr (freeVars expr)
-- ----------------------------------------------------------------------------
-- Bindings
-vectoriseModule :: VectInfo -> ModGuts -> DsM ModGuts
-vectoriseModule info guts
- = do
- builtins <- initBuiltins
- r <- runVM (vectModule guts) builtins (initGlobalEnv info) emptyLocalEnv
- case r of
- Yes genv _ guts' -> return $ updVectInfo genv guts'
- No -> return guts
-
-vectModule :: ModGuts -> VM ModGuts
-vectModule guts = return guts
-
-
-
-vectBndr :: Var -> VM (Var, Var)
+vectBndr :: Var -> VM VVar
vectBndr v
= do
vty <- vectType (idType v)
- lty <- mkPArrayTy vty
+ lty <- mkPArrayType vty
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 (Var vv, Var lv) }
+ mapTo vv lv env = env { local_vars = extendVarEnv (local_vars env) v (vv, lv) }
-vectBndrIn :: Var -> VM a -> VM (Var, Var, a)
+vectBndrIn :: Var -> VM a -> VM (VVar, a)
vectBndrIn v p
= localV
$ do
- (vv, lv) <- vectBndr v
+ vv <- vectBndr v
x <- p
- return (vv, lv, x)
+ return (vv, x)
+
+vectBndrIn' :: Var -> (VVar -> VM a) -> VM (VVar, a)
+vectBndrIn' v p
+ = localV
+ $ do
+ vv <- vectBndr v
+ x <- p vv
+ return (vv, x)
-vectBndrsIn :: [Var] -> VM a -> VM ([Var], [Var], a)
+vectBndrsIn :: [Var] -> VM a -> VM ([VVar], a)
vectBndrsIn vs p
= localV
$ do
- (vvs, lvs) <- mapAndUnzipM vectBndr vs
+ vvs <- mapM vectBndr vs
x <- p
- return (vvs, lvs, x)
+ return (vvs, x)
-- ----------------------------------------------------------------------------
-- Expressions
-replicateP :: CoreExpr -> CoreExpr -> VM CoreExpr
-replicateP expr len
- = do
- pa <- paOfType ty
- rep <- builtin replicatePAVar
- return $ mkApps (Var rep) [Type ty, pa, expr, len]
- where
- ty = exprType expr
-
-capply :: (CoreExpr, CoreExpr) -> (CoreExpr, CoreExpr) -> VM (CoreExpr, CoreExpr)
-capply (vfn, lfn) (varg, larg)
- = do
- apply <- builtin applyClosureVar
- applyP <- builtin applyClosurePVar
- return (mkApps (Var apply) [Type arg_ty, Type res_ty, vfn, varg],
- mkApps (Var applyP) [Type arg_ty, Type res_ty, lfn, larg])
- where
- fn_ty = exprType vfn
- (arg_ty, res_ty) = splitClosureTy fn_ty
-
-vectVar :: CoreExpr -> Var -> VM (CoreExpr, CoreExpr)
-vectVar lc v = local v `orElseV` global v
- where
- local v = maybeV (readLEnv $ \env -> lookupVarEnv (local_vars env) v)
- global v = do
- vexpr <- maybeV (readGEnv $ \env -> lookupVarEnv (global_vars env) v)
- lexpr <- replicateP vexpr lc
- return (vexpr, lexpr)
-
-vectExpr :: CoreExpr -> CoreExprWithFVs -> VM (CoreExpr, CoreExpr)
-vectExpr lc (_, AnnType ty)
+vectVar :: Var -> VM VExpr
+vectVar v
= do
- vty <- vectType ty
- return (Type vty, Type vty)
-vectExpr lc (_, AnnVar v) = vectVar lc v
-vectExpr lc (_, AnnLit lit)
- = do
- let vexpr = Lit lit
- lexpr <- replicateP vexpr lc
- return (vexpr, lexpr)
-vectExpr lc (_, AnnNote note expr)
- = do
- (vexpr, lexpr) <- vectExpr lc expr
- return (Note note vexpr, Note note lexpr)
-vectExpr lc (_, AnnApp fn arg)
- = do
- fn' <- vectExpr lc fn
- arg' <- vectExpr lc arg
- capply fn' arg'
-vectExpr lc (_, AnnCase expr bndr ty alts)
- = panic "vectExpr: case"
-vectExpr lc (_, AnnLet (AnnNonRec bndr rhs) body)
+ r <- lookupVar v
+ case r of
+ Local (vv,lv) -> return (Var vv, Var lv)
+ Global vv -> do
+ let vexpr = Var vv
+ lexpr <- liftPA vexpr
+ return (vexpr, lexpr)
+
+vectPolyVar :: Var -> [Type] -> VM VExpr
+vectPolyVar v tys
= do
- (vrhs, lrhs) <- vectExpr lc rhs
- (vbndr, lbndr, (vbody, lbody)) <- vectBndrIn bndr (vectExpr lc body)
- return (Let (NonRec vbndr vrhs) vbody,
- Let (NonRec lbndr lrhs) lbody)
-vectExpr lc (_, AnnLet (AnnRec prs) body)
+ 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 <- liftPA vexpr
+ return (vexpr, lexpr)
+
+vectLiteral :: Literal -> VM VExpr
+vectLiteral lit
= do
- (vbndrs, lbndrs, (vrhss, vbody, lrhss, lbody)) <- vectBndrsIn bndrs vect
- return (Let (Rec (zip vbndrs vrhss)) vbody,
- Let (Rec (zip lbndrs lrhss)) lbody)
+ lexpr <- liftPA (Lit lit)
+ return (Lit lit, lexpr)
+
+vectPolyExpr :: CoreExprWithFVs -> VM VExpr
+vectPolyExpr expr
+ = polyAbstract tvs $ \abstract ->
+ do
+ mono' <- vectExpr mono
+ return $ mapVect abstract mono'
where
- (bndrs, rhss) = unzip prs
-
- vect = do
- (vrhss, lrhss) <- mapAndUnzipM (vectExpr lc) rhss
- (vbody, lbody) <- vectExpr lc body
- return (vrhss, vbody, lrhss, lbody)
-
--- ----------------------------------------------------------------------------
--- PA dictionaries
+ (tvs, mono) = collectAnnTypeBinders expr
+
+vectExpr :: CoreExprWithFVs -> VM VExpr
+vectExpr (_, AnnType ty)
+ = liftM vType (vectType ty)
-paArgType :: Type -> Kind -> VM (Maybe Type)
-paArgType ty k
- | Just k' <- kindView k = paArgType ty k'
+vectExpr (_, AnnVar v) = vectVar v
--- Here, we assume that for a kind (k1 -> k2) to be valid, k1 and k2 can only
--- be made up of * and (->), i.e., they can't be coercion kinds or #.
-paArgType ty (FunTy k1 k2)
- = do
- tv <- newTyVar FSLIT("a") k1
- ty1 <- paArgType' (TyVarTy tv) k1
- ty2 <- paArgType' (AppTy ty (TyVarTy tv)) k2
- return . Just $ ForAllTy tv (FunTy ty1 ty2)
+vectExpr (_, AnnLit lit) = vectLiteral lit
-paArgType ty k
- | isLiftedTypeKind k
- = do
- tc <- builtin paTyCon
- return . Just $ TyConApp tc [ty]
+vectExpr (_, AnnNote note expr)
+ = liftM (vNote note) (vectExpr expr)
- | otherwise
- = return Nothing
+vectExpr e@(_, AnnApp _ arg)
+ | isAnnTypeArg arg
+ = vectTyAppExpr fn tys
+ where
+ (fn, tys) = collectAnnTypeArgs e
-paArgType' :: Type -> Kind -> VM Type
-paArgType' ty k
+vectExpr (_, AnnApp fn arg)
= do
- r <- paArgType ty k
- case r of
- Just ty' -> return ty'
- Nothing -> pprPanic "paArgType'" (ppr ty)
+ fn' <- vectExpr fn
+ arg' <- vectExpr arg
+ mkClosureApp fn' arg'
-paOfTyCon :: TyCon -> VM CoreExpr
--- FIXME: just for now
-paOfTyCon tc = maybeV (readGEnv $ \env -> lookupNameEnv (global_tycon_pa env) (tyConName tc))
+vectExpr (_, AnnCase scrut bndr ty alts)
+ | isAlgType scrut_ty
+ = vectAlgCase scrut bndr ty alts
+ where
+ scrut_ty = exprType (deAnnotate scrut)
-paOfType :: Type -> VM CoreExpr
-paOfType ty | Just ty' <- coreView ty = paOfType ty'
+vectExpr (_, AnnCase expr bndr ty alts)
+ = panic "vectExpr: case"
-paOfType (TyVarTy tv) = maybeV (readLEnv $ \env -> lookupVarEnv (local_tyvar_pa env) tv)
-paOfType (AppTy ty1 ty2)
+vectExpr (_, AnnLet (AnnNonRec bndr rhs) body)
= do
- e1 <- paOfType ty1
- e2 <- paOfType ty2
- return $ mkApps e1 [Type ty2, e2]
-paOfType (TyConApp tc tys)
- = do
- e <- paOfTyCon tc
- es <- mapM paOfType tys
- return $ mkApps e [arg | (t,e) <- zip tys es, arg <- [Type t, e]]
-paOfType (FunTy ty1 ty2) = paOfType (TyConApp funTyCon [ty1,ty2])
-paOfType t@(ForAllTy tv ty) = pprPanic "paOfType:" (ppr t)
-paOfType ty = pprPanic "paOfType:" (ppr ty)
-
-
+ vrhs <- localV . inBind bndr $ vectPolyExpr rhs
+ (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
+ return $ vLet (vNonRec vbndr vrhs) vbody
--- ----------------------------------------------------------------------------
--- Types
-
-vectTyCon :: TyCon -> VM TyCon
-vectTyCon tc
- | isFunTyCon tc = builtin closureTyCon
- | isBoxedTupleTyCon tc = return tc
- | isUnLiftedTyCon tc = return tc
- | otherwise = do
- r <- lookupTyCon tc
- case r of
- Just tc' -> return tc'
-
- -- FIXME: just for now
- Nothing -> pprTrace "ccTyCon:" (ppr tc) $ return tc
-
-vectType :: Type -> VM Type
-vectType ty | Just ty' <- coreView ty = vectType ty
-vectType (TyVarTy tv) = return $ TyVarTy tv
-vectType (AppTy ty1 ty2) = liftM2 AppTy (vectType ty1) (vectType ty2)
-vectType (TyConApp tc tys) = liftM2 TyConApp (vectTyCon tc) (mapM vectType tys)
-vectType (FunTy ty1 ty2) = liftM2 TyConApp (builtin closureTyCon)
- (mapM vectType [ty1,ty2])
-vectType (ForAllTy tv ty)
+vectExpr (_, AnnLet (AnnRec bs) body)
= do
- r <- paArgType (TyVarTy tv) (tyVarKind tv)
- ty' <- vectType ty
- return . ForAllTy tv $ case r of { Just paty -> FunTy paty ty'; Nothing -> ty' }
-
-vectType ty = pprPanic "vectType:" (ppr ty)
-
-isClosureTyCon :: TyCon -> Bool
-isClosureTyCon tc = tyConUnique tc == closureTyConKey
+ (vbndrs, (vrhss, vbody)) <- vectBndrsIn bndrs
+ $ liftM2 (,)
+ (zipWithM vect_rhs bndrs rhss)
+ (vectPolyExpr body)
+ return $ vLet (vRec vbndrs vrhss) vbody
+ where
+ (bndrs, rhss) = unzip bs
-splitClosureTy :: Type -> (Type, Type)
-splitClosureTy ty
- | Just (tc, [arg_ty, res_ty]) <- splitTyConApp_maybe ty
- , isClosureTyCon tc
- = (arg_ty, res_ty)
+ vect_rhs bndr rhs = localV
+ . inBind bndr
+ $ vectExpr rhs
- | otherwise = pprPanic "splitClosureTy" (ppr ty)
+vectExpr e@(fvs, AnnLam bndr _)
+ | not (isId bndr) = pprPanic "vectExpr" (ppr $ deAnnotate e)
+ | otherwise = vectLam fvs bs body
+ where
+ (bs,body) = collectAnnValBinders e
-mkPArrayTy :: Type -> VM Type
-mkPArrayTy ty = do
- tc <- builtin parrayTyCon
- return $ TyConApp tc [ty]
+vectLam :: VarSet -> [Var] -> CoreExprWithFVs -> VM VExpr
+vectLam 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
+ $ do
+ lc <- builtin liftingContext
+ (vbndrs, vbody) <- vectBndrsIn (vs ++ bs)
+ (vectExpr body)
+ return $ vLams lc vbndrs vbody
+
+vectTyAppExpr :: CoreExprWithFVs -> [Type] -> VM VExpr
+vectTyAppExpr (_, AnnVar v) tys = vectPolyVar v tys
+vectTyAppExpr e tys = pprPanic "vectTyAppExpr" (ppr $ deAnnotate e)
+
+type CoreAltWithFVs = AnnAlt Id VarSet
+
+-- 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.
+--
+
+-- FIXME: this is too lazy
+vectAlgCase scrut bndr ty [(DEFAULT, [], body)]
+ = do
+ vscrut <- vectExpr scrut
+ vty <- vectType ty
+ lty <- mkPArrayType vty
+ (vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
+ return $ vCaseDEFAULT vscrut vbndr vty lty vbody
+vectAlgCase scrut bndr ty [(DataAlt dc, bndrs, body)]
+ = do
+ vty <- vectType ty
+ lty <- mkPArrayType vty
+ vexpr <- vectExpr scrut
+ (vbndr, (vbndrs, vbody)) <- vectBndrIn bndr
+ . vectBndrsIn bndrs
+ $ vectExpr body
+
+ (vscrut, arr_tc, arg_tys) <- mkVScrut (vVar vbndr)
+ vect_dc <- maybeV (lookupDataCon dc)
+ let [arr_dc] = tyConDataCons arr_tc
+ let shape_tys = take (dataConRepArity arr_dc - length bndrs)
+ (dataConRepArgTys arr_dc)
+ shape_bndrs <- mapM (newLocalVar FSLIT("s")) shape_tys
+ return . vLet (vNonRec vbndr vexpr)
+ $ vCaseProd vscrut vty lty vect_dc arr_dc shape_bndrs vbndrs vbody
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