-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and fix
-- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/CodingStyle#Warnings
+-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
-- for details
module Vectorise( vectorise )
import DsMonad hiding (mapAndUnzipM)
import DsUtils ( mkCoreTup, mkCoreTupTy )
-import Literal ( Literal )
+import Literal ( Literal, mkMachInt )
import PrelNames
import TysWiredIn
import TysPrim ( intPrimTy )
import Outputable
import FastString
import Control.Monad ( liftM, liftM2, zipWithM, mapAndUnzipM )
+import Data.List ( sortBy, unzip4 )
vectorise :: HscEnv -> UniqSupply -> RuleBase -> ModGuts
-> IO (SimplCount, 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)
var' <- vectTopBinder var
expr' <- vectTopRhs var expr
hs <- takeHoisted
- return . Rec $ (var, expr) : (var', expr') : hs
+ cexpr <- tryConvert var var' expr
+ return . Rec $ (var, cexpr) : (var', expr') : hs
`orElseV`
return b
vars' <- mapM vectTopBinder vars
exprs' <- zipWithM vectTopRhs vars exprs
hs <- takeHoisted
- return . Rec $ bs ++ zip vars' exprs' ++ hs
+ cexprs <- sequence $ zipWith3 tryConvert vars vars' exprs
+ return . Rec $ zip vars cexprs ++ zip vars' exprs' ++ hs
`orElseV`
return b
where
var' <- cloneId mkVectOcc var vty
defGlobalVar var var'
return var'
-
+
vectTopRhs :: Var -> CoreExpr -> VM CoreExpr
vectTopRhs var expr
= do
. inBind var
$ vectPolyExpr (freeVars expr)
+tryConvert :: Var -> Var -> CoreExpr -> VM CoreExpr
+tryConvert var vect_var rhs
+ = fromVect (idType var) (Var vect_var) `orElseV` return rhs
+
-- ----------------------------------------------------------------------------
-- Bindings
where
mapTo vv lv env = env { local_vars = extendVarEnv (local_vars env) v (vv, lv) }
+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 }
+
vectBndrIn :: Var -> VM a -> VM (VVar, a)
vectBndrIn v p
= localV
x <- p
return (vv, x)
+vectBndrNewIn :: Var -> FastString -> VM a -> VM (VVar, a)
+vectBndrNewIn v fs p
+ = localV
+ $ do
+ vv <- vectBndrNew v fs
+ x <- p
+ return (vv, x)
+
vectBndrIn' :: Var -> (VVar -> VM a) -> VM (VVar, a)
vectBndrIn' v p
= localV
return (Lit lit, lexpr)
vectPolyExpr :: CoreExprWithFVs -> VM VExpr
+vectPolyExpr (_, AnnNote note expr)
+ = liftM (vNote note) $ vectPolyExpr expr
vectPolyExpr expr
= polyAbstract tvs $ \abstract ->
do
mono' <- vectExpr mono
return $ mapVect abstract mono'
where
- (tvs, mono) = collectAnnTypeBinders expr
-
+ (tvs, mono) = collectAnnTypeBinders expr
+
vectExpr :: CoreExprWithFVs -> VM VExpr
vectExpr (_, AnnType ty)
= liftM vType (vectType ty)
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 <- liftPA vexpr
+ return (vexpr, lexpr)
+ where
+ is_special_con con = con `elem` [intDataCon, floatDataCon, doubleDataCon]
+
+
vectExpr (_, AnnApp fn arg)
= do
arg_ty' <- vectType arg_ty
(arg_ty, res_ty) = splitFunTy . exprType $ deAnnotate fn
vectExpr (_, AnnCase scrut bndr ty alts)
- | isAlgType scrut_ty
- = vectAlgCase 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)
where
(bs,body) = collectAnnValBinders e
+vectExpr e = pprPanic "vectExpr" (ppr $ deAnnotate e)
+
vectLam :: VarSet -> [Var] -> CoreExprWithFVs -> VM VExpr
vectLam fvs bs body
= do
(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)
--
-- to
--
--- V: let v = e in case v of _ { ... }
--- L: let v = e in case v `cast` ... of _ { ... }
+-- 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.
---
+-- [: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 scrut bndr ty [(DEFAULT, [], body)]
+vectAlgCase tycon ty_args 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 tycon ty_args scrut bndr ty [(DataAlt dc, [], body)]
= do
vscrut <- vectExpr scrut
vty <- vectType ty
(vbndr, vbody) <- vectBndrIn bndr (vectExpr body)
return $ vCaseDEFAULT vscrut vbndr vty lty vbody
-vectAlgCase scrut bndr ty [(DataAlt dc, bndrs, body)]
+vectAlgCase tycon ty_args scrut bndr ty [(DataAlt dc, bndrs, body)]
= do
+ vect_tc <- maybeV (lookupTyCon tycon)
vty <- vectType ty
lty <- mkPArrayType vty
vexpr <- vectExpr scrut
- (vbndr, (vbndrs, vbody)) <- vectBndrIn bndr
+ (vbndr, (vbndrs, vbody)) <- vect_scrut_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
+ repr <- mkRepr vect_tc
+ shape_bndrs <- arrShapeVars repr
return . vLet (vNonRec vbndr vexpr)
$ vCaseProd vscrut vty lty vect_dc arr_dc shape_bndrs vbndrs vbody
+ where
+ vect_scrut_bndr | isDeadBinder bndr = vectBndrNewIn bndr FSLIT("scrut")
+ | otherwise = vectBndrIn bndr
+
+vectAlgCase tycon ty_args scrut bndr ty alts
+ = do
+ vect_tc <- maybeV (lookupTyCon tycon)
+ vty <- vectType ty
+ lty <- mkPArrayType vty
+
+ repr <- mkRepr vect_tc
+ shape_bndrs <- arrShapeVars repr
+ (len, sel, indices) <- arrSelector repr (map Var shape_bndrs)
+
+ (vbndr, valts) <- vect_scrut_bndr $ mapM (proc_alt sel vty lty) alts'
+ let (vect_dcs, vect_bndrss, lift_bndrss, vbodies) = unzip4 valts
+
+ vexpr <- vectExpr scrut
+ (vscrut, arr_tc, arg_tys) <- mkVScrut (vVar vbndr)
+ let [arr_dc] = tyConDataCons arr_tc
+
+ let (vect_scrut, lift_scrut) = vscrut
+ (vect_bodies, lift_bodies) = unzip vbodies
+
+ let vect_case = Case vect_scrut (mkWildId (exprType vect_scrut)) vty
+ (zipWith3 mk_vect_alt vect_dcs vect_bndrss vect_bodies)
+
+ lbody <- combinePA vty len sel indices lift_bodies
+ let lift_case = Case lift_scrut (mkWildId (exprType lift_scrut)) lty
+ [(DataAlt arr_dc, shape_bndrs ++ 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
+
+ proc_alt sel vty lty (DataAlt dc, bndrs, body)
+ = do
+ vect_dc <- maybeV (lookupDataCon dc)
+ let tag = mkDataConTag vect_dc
+ fvs = freeVarsOf body `delVarSetList` bndrs
+ (vect_bndrs, lift_bndrs, vbody)
+ <- vect_alt_bndrs bndrs
+ $ \len -> packLiftingContext len sel tag fvs vty lty
+ $ vectExpr body
+
+ return (vect_dc, vect_bndrs, lift_bndrs, vbody)
+
+ vect_alt_bndrs [] p
+ = do
+ void_tc <- builtin voidTyCon
+ let void_ty = mkTyConApp void_tc []
+ arr_ty <- mkPArrayType void_ty
+ bndr <- newLocalVar FSLIT("voids") arr_ty
+ len <- lengthPA void_ty (Var bndr)
+ e <- p len
+ return ([], [bndr], e)
+
+ vect_alt_bndrs bndrs p
+ = localV
+ $ do
+ vbndrs <- mapM vectBndr bndrs
+ let (vect_bndrs, lift_bndrs) = unzip vbndrs
+ vv : _ = vect_bndrs
+ lv : _ = lift_bndrs
+ len <- lengthPA (idType vv) (Var lv)
+ e <- p len
+ return (vect_bndrs, lift_bndrs, e)
+
+ mk_vect_alt vect_dc bndrs body = (DataAlt vect_dc, bndrs, body)
+
+packLiftingContext :: CoreExpr -> CoreExpr -> CoreExpr -> VarSet
+ -> Type -> Type -> VM VExpr -> VM VExpr
+packLiftingContext len shape tag fvs vty lty p
+ = do
+ select <- builtin selectPAIntPrimVar
+ let sel_expr = mkApps (Var select) [shape, tag]
+ sel_var <- newLocalVar FSLIT("sel#") (exprType sel_expr)
+ lc_var <- builtin liftingContext
+ localV $
+ do
+ bnds <- mapM (packFreeVar (Var lc_var) (Var sel_var))
+ . filter isLocalId
+ $ varSetElems fvs
+ (vexpr, lexpr) <- p
+ empty <- emptyPA vty
+ return (vexpr, Let (NonRec sel_var sel_expr)
+ $ Case len lc_var lty
+ [(DEFAULT, [], mkLets (concat bnds) lexpr),
+ (LitAlt (mkMachInt 0), [], empty)])
+
+packFreeVar :: CoreExpr -> CoreExpr -> Var -> VM [CoreBind]
+packFreeVar len sel v
+ = do
+ r <- lookupVar v
+ case r of
+ Local (vv,lv) ->
+ do
+ lv' <- cloneVar lv
+ expr <- packPA (idType vv) (Var lv) len sel
+ updLEnv (upd vv lv')
+ return [(NonRec lv' expr)]
+
+ _ -> return []
+ where
+ upd vv lv' env = env { local_vars = extendVarEnv (local_vars env) v (vv, lv') }
+
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