#include "HsVersions.h"
-import CmdLineOpts ( dopt, DynFlag(Opt_D_dump_inlinings),
+import DynFlags ( dopt, DynFlag(Opt_D_dump_inlinings),
SimplifierSwitch(..)
)
import SimplMonad
-import SimplUtils ( mkCase, mkLam, newId, prepareAlts,
- simplBinder, simplBinders, simplLamBndrs, simplRecBndrs, simplLetBndr,
+import SimplEnv
+import SimplUtils ( mkCase, mkLam, prepareAlts,
SimplCont(..), DupFlag(..), LetRhsFlag(..),
mkRhsStop, mkBoringStop, pushContArgs,
contResultType, countArgs, contIsDupable, contIsRhsOrArg,
- getContArgs, interestingCallContext, interestingArg, isStrictType
+ getContArgs, interestingCallContext, interestingArg, isStrictType,
+ preInlineUnconditionally, postInlineUnconditionally,
+ inlineMode, activeInline, activeRule
)
import Id ( Id, idType, idInfo, idArity, isDataConWorkId,
setIdUnfolding, isDeadBinder,
idNewDemandInfo, setIdInfo,
- setIdOccInfo, zapLamIdInfo, setOneShotLambda,
+ setIdOccInfo, zapLamIdInfo, setOneShotLambda
)
import MkId ( eRROR_ID )
import Literal ( mkStringLit )
-import OccName ( encodeFS )
import IdInfo ( OccInfo(..), isLoopBreaker,
setArityInfo, zapDemandInfo,
setUnfoldingInfo,
)
import NewDemand ( isStrictDmd )
import Unify ( coreRefineTys )
-import DataCon ( dataConTyCon, dataConRepStrictness, isVanillaDataCon, dataConResTy )
+import DataCon ( dataConTyCon, dataConRepStrictness, isVanillaDataCon )
import TyCon ( tyConArity )
import CoreSyn
import PprCore ( pprParendExpr, pprCoreExpr )
-import CoreUnfold ( mkOtherCon, mkUnfolding, callSiteInline )
+import CoreUnfold ( mkUnfolding, callSiteInline )
import CoreUtils ( exprIsDupable, exprIsTrivial, needsCaseBinding,
exprIsConApp_maybe, mkPiTypes, findAlt,
- exprType, exprIsValue,
+ exprType, exprIsHNF,
exprOkForSpeculation, exprArity,
mkCoerce, mkCoerce2, mkSCC, mkInlineMe, applyTypeToArg
)
import BasicTypes ( isMarkedStrict )
import CostCentre ( currentCCS )
import Type ( TvSubstEnv, isUnLiftedType, seqType, tyConAppArgs, funArgTy,
- splitFunTy_maybe, splitFunTy, coreEqType, substTy,
- mkTyVarTys, mkTyConApp
+ splitFunTy_maybe, splitFunTy, coreEqType
)
-import VarEnv ( elemVarEnv )
-import Subst ( SubstResult(..), emptySubst, substExpr,
- substId, simplIdInfo )
+import VarEnv ( elemVarEnv, emptyVarEnv )
import TysPrim ( realWorldStatePrimTy )
import PrelInfo ( realWorldPrimId )
import BasicTypes ( TopLevelFlag(..), isTopLevel,
RecFlag(..), isNonRec
)
+import StaticFlags ( opt_PprStyle_Debug )
import OrdList
-import Maybe ( Maybe )
import Maybes ( orElse )
import Outputable
-import Util ( notNull, equalLength )
+import Util ( notNull )
\end{code}
-- so that if a transformation rule has unexpectedly brought
-- anything into scope, then we don't get a complaint about that.
-- It's rather as if the top-level binders were imported.
- simplRecBndrs env (bindersOfBinds binds) `thenSmpl` \ (env, bndrs') ->
+ simplLetBndrs env (bindersOfBinds binds) `thenSmpl` \ (env, bndrs') ->
simpl_binds env binds bndrs' `thenSmpl` \ (floats, _) ->
freeTick SimplifierDone `thenSmpl_`
returnSmpl (floatBinds floats)
#endif
simplNonRecBind env bndr rhs rhs_se cont_ty thing_inside
- | preInlineUnconditionally env NotTopLevel bndr
- = tick (PreInlineUnconditionally bndr) `thenSmpl_`
- thing_inside (extendIdSubst env bndr (ContEx (getSubst rhs_se) rhs))
+ = simplNonRecBind' env bndr rhs rhs_se cont_ty thing_inside
+simplNonRecBind' env bndr rhs rhs_se cont_ty thing_inside
+ | preInlineUnconditionally env NotTopLevel bndr rhs
+ = tick (PreInlineUnconditionally bndr) `thenSmpl_`
+ thing_inside (extendIdSubst env bndr (mkContEx rhs_se rhs))
- | isStrictDmd (idNewDemandInfo bndr) || isStrictType (idType bndr) -- A strict let
+ | isStrictDmd (idNewDemandInfo bndr) || isStrictType bndr_ty -- A strict let
= -- Don't use simplBinder because that doesn't keep
-- fragile occurrence info in the substitution
simplLetBndr env bndr `thenSmpl` \ (env, bndr1) ->
let
-- simplLetBndr doesn't deal with the IdInfo, so we must
-- do so here (c.f. simplLazyBind)
- bndr2 = bndr1 `setIdInfo` simplIdInfo (getSubst env) (idInfo bndr)
+ bndr2 = bndr1 `setIdInfo` simplIdInfo env (idInfo bndr)
env2 = modifyInScope env1 bndr2 bndr2
in
- completeNonRecX env2 True {- strict -} bndr bndr2 rhs1 thing_inside
+ if needsCaseBinding bndr_ty rhs1
+ then
+ thing_inside env2 `thenSmpl` \ (floats, body) ->
+ returnSmpl (emptyFloats env2, Case rhs1 bndr2 (exprType body)
+ [(DEFAULT, [], wrapFloats floats body)])
+ else
+ completeNonRecX env2 True {- strict -} bndr bndr2 rhs1 thing_inside
| otherwise -- Normal, lazy case
= -- Don't use simplBinder because that doesn't keep
simplLazyBind env NotTopLevel NonRecursive
bndr bndr' rhs rhs_se `thenSmpl` \ (floats, env) ->
addFloats env floats thing_inside
+
+ where
+ bndr_ty = idType bndr
\end{code}
A specialised variant of simplNonRec used when the RHS is already simplified, notably
-- because quotInt# can fail.
= simplBinder env bndr `thenSmpl` \ (env, bndr') ->
thing_inside env `thenSmpl` \ (floats, body) ->
--- gaw 2004
let body' = wrapFloats floats body in
returnSmpl (emptyFloats env, Case new_rhs bndr' (exprType body') [(DEFAULT, [], body')])
- | preInlineUnconditionally env NotTopLevel bndr
+ | preInlineUnconditionally env NotTopLevel bndr new_rhs
-- This happens; for example, the case_bndr during case of
-- known constructor: case (a,b) of x { (p,q) -> ... }
-- Here x isn't mentioned in the RHS, so we don't want to
-- Similarly, single occurrences can be inlined vigourously
-- e.g. case (f x, g y) of (a,b) -> ....
-- If a,b occur once we can avoid constructing the let binding for them.
- = thing_inside (extendIdSubst env bndr (ContEx emptySubst new_rhs))
+ = thing_inside (extendIdSubst env bndr (DoneEx new_rhs))
| otherwise
= simplBinder env bndr `thenSmpl` \ (env, bndr') ->
-> SimplM (FloatsWith SimplEnv)
simplRecOrTopPair env top_lvl bndr bndr' rhs
- | preInlineUnconditionally env top_lvl bndr -- Check for unconditional inline
- = tick (PreInlineUnconditionally bndr) `thenSmpl_`
- returnSmpl (emptyFloats env, extendIdSubst env bndr (ContEx (getSubst env) rhs))
+ | preInlineUnconditionally env top_lvl bndr rhs -- Check for unconditional inline
+ = tick (PreInlineUnconditionally bndr) `thenSmpl_`
+ returnSmpl (emptyFloats env, extendIdSubst env bndr (mkContEx env rhs))
| otherwise
= simplLazyBind env top_lvl Recursive bndr bndr' rhs env
-- NB 4: does no harm for non-recursive bindings
- bndr2 = bndr1 `setIdInfo` simplIdInfo (getSubst env) (idInfo bndr)
+ bndr2 = bndr1 `setIdInfo` simplIdInfo env (idInfo bndr)
env1 = modifyInScope env bndr2 bndr2
rhs_env = setInScope rhs_se env1
is_top_level = isTopLevel top_lvl
if isEmptyFloats floats && isNilOL aux_binds then -- Shortcut a common case
completeLazyBind env1 top_lvl bndr bndr2 rhs2
- else if is_top_level || exprIsTrivial rhs2 || exprIsValue rhs2 then
+ else if is_top_level || exprIsTrivial rhs2 || exprIsHNF rhs2 then
-- WARNING: long dodgy argument coming up
-- WANTED: a better way to do this
--
- -- We can't use "exprIsCheap" instead of exprIsValue,
+ -- We can't use "exprIsCheap" instead of exprIsHNF,
-- because that causes a strictness bug.
-- x = let y* = E in case (scc y) of { T -> F; F -> T}
-- The case expression is 'cheap', but it's wrong to transform to
-- y* = E; x = case (scc y) of {...}
-- Either we must be careful not to float demanded non-values, or
- -- we must use exprIsValue for the test, which ensures that the
- -- thing is non-strict. So exprIsValue => bindings are non-strict
+ -- we must use exprIsHNF for the test, which ensures that the
+ -- thing is non-strict. So exprIsHNF => bindings are non-strict
-- I think. The WARN below tests for this.
--
-- We use exprIsTrivial here because we want to reveal lone variables.
-- E.g. let { x = letrec { y = E } in y } in ...
-- Here we definitely want to float the y=E defn.
- -- exprIsValue definitely isn't right for that.
+ -- exprIsHNF definitely isn't right for that.
--
-- Again, the floated binding can't be strict; if it's recursive it'll
-- be non-strict; if it's non-recursive it'd be inlined.
-- (as usual) use the in-scope-env from the floats
completeLazyBind env top_lvl old_bndr new_bndr new_rhs
- | postInlineUnconditionally env new_bndr occ_info new_rhs
+ | postInlineUnconditionally env top_lvl new_bndr occ_info new_rhs unfolding
= -- Drop the binding
tick (PostInlineUnconditionally old_bndr) `thenSmpl_`
returnSmpl (emptyFloats env, extendIdSubst env old_bndr (DoneEx new_rhs))
-- After inling f at some of its call sites the original binding may
-- (for example) be no longer strictly demanded.
-- The solution here is a bit ad hoc...
- unfolding = mkUnfolding (isTopLevel top_lvl) new_rhs
info_w_unf = new_bndr_info `setUnfoldingInfo` unfolding
final_info | loop_breaker = new_bndr_info
| isEvaldUnfolding unfolding = zapDemandInfo info_w_unf `orElse` info_w_unf
returnSmpl (unitFloat env final_id new_rhs, env)
where
+ unfolding = mkUnfolding (isTopLevel top_lvl) new_rhs
loop_breaker = isLoopBreaker occ_info
old_info = idInfo old_bndr
occ_info = occInfo old_info
simplExpr :: SimplEnv -> CoreExpr -> SimplM CoreExpr
simplExpr env expr = simplExprC env expr (mkBoringStop expr_ty')
where
- expr_ty' = substTy (getTvSubst env) (exprType expr)
+ expr_ty' = substTy env (exprType expr)
-- The type in the Stop continuation, expr_ty', is usually not used
-- It's only needed when discarding continuations after finding
-- a function that returns bottom.
simplType env ty `thenSmpl` \ ty' ->
rebuild env (Type ty') cont
--- gaw 2004
simplExprF env (Case scrut bndr case_ty alts) cont
| not (switchIsOn (getSwitchChecker env) NoCaseOfCase)
= -- Simplify the scrutinee with a Select continuation
rebuild env case_expr' cont
where
case_cont = Select NoDup bndr alts env (mkBoringStop case_ty')
- case_ty' = substTy (getTvSubst env) case_ty -- c.f. defn of simplExpr
+ case_ty' = substTy env case_ty -- c.f. defn of simplExpr
simplExprF env (Let (Rec pairs) body) cont
- = simplRecBndrs env (map fst pairs) `thenSmpl` \ (env, bndrs') ->
+ = simplLetBndrs env (map fst pairs) `thenSmpl` \ (env, bndrs') ->
-- NB: bndrs' don't have unfoldings or rules
-- We add them as we go down
simplType env ty
= seqType new_ty `seq` returnSmpl new_ty
where
- new_ty = substTy (getTvSubst env) ty
+ new_ty = substTy env ty
\end{code}
\begin{code}
simplNote env (Coerce to from) body cont
= let
+ addCoerce s1 k1 cont -- Drop redundant coerces. This can happen if a polymoprhic
+ -- (coerce a b e) is instantiated with a=ty1 b=ty2 and the
+ -- two are the same. This happens a lot in Happy-generated parsers
+ | s1 `coreEqType` k1 = cont
+
addCoerce s1 k1 (CoerceIt t1 cont)
-- coerce T1 S1 (coerce S1 K1 e)
-- ==>
-- we may find (coerce T (coerce S (\x.e))) y
-- and we'd like it to simplify to e[y/x] in one round
-- of simplification
- | t1 `coreEqType` k1 = cont -- The coerces cancel out
- | otherwise = CoerceIt t1 cont -- They don't cancel, but
- -- the inner one is redundant
+ | t1 `coreEqType` k1 = cont -- The coerces cancel out
+ | otherwise = CoerceIt t1 cont -- They don't cancel, but
+ -- the inner one is redundant
addCoerce t1t2 s1s2 (ApplyTo dup arg arg_se cont)
| not (isTypeArg arg), -- This whole case only works for value args
-- But it isn't a common case.
= let
(t1,t2) = splitFunTy t1t2
- new_arg = mkCoerce2 s1 t1 (substExpr subst arg)
- subst = getSubst (setInScope arg_se env)
+ new_arg = mkCoerce2 s1 t1 (substExpr arg_env arg)
+ arg_env = setInScope arg_se env
in
ApplyTo dup new_arg (zapSubstEnv env) (addCoerce t2 s2 cont)
\begin{code}
simplVar env var cont
- = case substId (getSubst env) var of
- DoneEx e -> simplExprF (zapSubstEnv env) e cont
- ContEx se e -> simplExprF (setSubstEnv env se) e cont
- DoneId var1 occ -> completeCall (zapSubstEnv env) var1 occ cont
+ = case substId env var of
+ DoneEx e -> simplExprF (zapSubstEnv env) e cont
+ ContEx tvs ids e -> simplExprF (setSubstEnv env tvs ids) e cont
+ DoneId var1 occ -> completeCall (zapSubstEnv env) var1 occ cont
-- Note [zapSubstEnv]
-- The template is already simplified, so don't re-substitute.
-- This is VITAL. Consider
let
in_scope = getInScope env
+ rules = getRules env
maybe_rule = case activeRule env of
Nothing -> Nothing -- No rules apply
- Just act_fn -> lookupRule act_fn in_scope var args
+ Just act_fn -> lookupRule act_fn in_scope rules var args
in
case maybe_rule of {
Just (rule_name, rule_rhs) ->
case maybe_inline of {
Just unfolding -- There is an inlining!
-> tick (UnfoldingDone var) `thenSmpl_`
+ (if dopt Opt_D_dump_inlinings dflags then
+ pprTrace "Inlining done" (vcat [
+ text "Before:" <+> ppr var <+> sep (map pprParendExpr args),
+ text "Inlined fn: " <+> ppr unfolding,
+ text "Cont: " <+> ppr call_cont])
+ else
+ id) $
makeThatCall env var unfolding args call_cont
;
rebuildCase :: SimplEnv
-> OutExpr -- Scrutinee
-> InId -- Case binder
- -> [InAlt] -- Alternatives
+ -> [InAlt] -- Alternatives (inceasing order)
-> SimplCont
-> SimplM FloatsWithExpr
= knownCon env (LitAlt lit) [] case_bndr alts cont
| otherwise
- = prepareAlts scrut case_bndr alts `thenSmpl` \ (better_alts, handled_cons) ->
+ = -- Prepare the alternatives.
+ prepareAlts scrut case_bndr alts `thenSmpl` \ (better_alts, handled_cons) ->
- -- Deal with the case binder, and prepare the continuation;
+ -- Prepare the continuation;
-- The new subst_env is in place
prepareCaseCont env better_alts cont `thenSmpl` \ (floats, (dup_cont, nondup_cont)) ->
addFloats env floats $ \ env ->
res_ty' = contResultType dup_cont
in
- -- Deal with variable scrutinee
+ -- Deal with case binder
simplCaseBinder env scrut case_bndr `thenSmpl` \ (alt_env, case_bndr') ->
-- Deal with the case alternatives
-> SimplM [OutAlt] -- Includes the continuation
simplAlts env handled_cons case_bndr' alts cont'
- = mapSmpl simpl_alt alts
+ = do { mb_alts <- mapSmpl simpl_alt alts
+ ; return [alt' | Just (_, alt') <- mb_alts] }
+ -- Filter out the alternatives that are inaccessible
where
- simpl_alt alt = simplAlt env handled_cons case_bndr' alt cont' `thenSmpl` \ (_, alt') ->
- returnSmpl alt'
+ simpl_alt alt = simplAlt env handled_cons case_bndr' alt cont'
simplAlt :: SimplEnv -> [AltCon] -> OutId -> InAlt -> SimplCont
- -> SimplM (Maybe TvSubstEnv, OutAlt)
+ -> SimplM (Maybe (TvSubstEnv, OutAlt))
-- Simplify an alternative, returning the type refinement for the
-- alternative, if the alternative does any refinement at all
+-- Nothing => the alternative is inaccessible
simplAlt env handled_cons case_bndr' (DEFAULT, bndrs, rhs) cont'
= ASSERT( null bndrs )
simplExprC env' rhs cont' `thenSmpl` \ rhs' ->
- returnSmpl (Nothing, (DEFAULT, [], rhs'))
+ returnSmpl (Just (emptyVarEnv, (DEFAULT, [], rhs')))
where
env' = mk_rhs_env env case_bndr' (mkOtherCon handled_cons)
-- Record the constructors that the case-binder *can't* be.
simplAlt env handled_cons case_bndr' (LitAlt lit, bndrs, rhs) cont'
= ASSERT( null bndrs )
simplExprC env' rhs cont' `thenSmpl` \ rhs' ->
- returnSmpl (Nothing, (LitAlt lit, [], rhs'))
+ returnSmpl (Just (emptyVarEnv, (LitAlt lit, [], rhs')))
where
env' = mk_rhs_env env case_bndr' (mkUnfolding False (Lit lit))
env' = mk_rhs_env env case_bndr' unf
in
simplExprC env' rhs cont' `thenSmpl` \ rhs' ->
- returnSmpl (Nothing, (DataAlt con, vs', rhs'))
+ returnSmpl (Just (emptyVarEnv, (DataAlt con, vs', rhs')))
| otherwise -- GADT case
= let
(tvs,ids) = span isTyVar vs
in
simplBinders env tvs `thenSmpl` \ (env1, tvs') ->
- let
- pat_res_ty = dataConResTy con (mkTyVarTys tvs')
- tv_subst = getTvSubst env1
- in
- case coreRefineTys tvs' tv_subst pat_res_ty (idType case_bndr') of {
- Nothing -- Dead code; for now, I'm just going to put in an
- -- error case so I can see them
+ case coreRefineTys (getInScope env1) con tvs' (idType case_bndr') of {
+ Nothing -- Inaccessible
+ | opt_PprStyle_Debug -- Hack: if debugging is on, generate an error case
+ -- so we can see it
-> let rhs' = mkApps (Var eRROR_ID)
- [Type (substTy tv_subst (exprType rhs)),
+ [Type (substTy env (exprType rhs)),
Lit (mkStringLit "Impossible alternative (GADT)")]
in
simplBinders env1 ids `thenSmpl` \ (env2, ids') ->
- returnSmpl (Nothing, (DataAlt con, tvs' ++ ids', rhs')) ;
+ returnSmpl (Just (emptyVarEnv, (DataAlt con, tvs' ++ ids', rhs')))
- Just tv_subst_env -> -- The normal case
+ | otherwise -- Filter out the inaccessible branch
+ -> return Nothing ;
+
+ Just refine@(tv_subst_env, _) -> -- The normal case
let
- env2 = setTvSubstEnv env1 tv_subst_env
+ env2 = refineSimplEnv env1 refine
-- Simplify the Ids in the refined environment, so their types
-- reflect the refinement. Usually this doesn't matter, but it helps
-- in mkDupableAlt, when we want to float a lambda that uses these binders
+ -- Furthermore, it means the binders contain maximal type information
in
simplBinders env2 (add_evals con ids) `thenSmpl` \ (env3, ids') ->
let unf = mkUnfolding False con_app
vs' = tvs' ++ ids'
in
simplExprC env_w_unf rhs cont' `thenSmpl` \ rhs' ->
- returnSmpl (Just tv_subst_env, (DataAlt con, vs', rhs')) }
+ returnSmpl (Just (tv_subst_env, (DataAlt con, vs', rhs'))) }
where
-- add_evals records the evaluated-ness of the bound variables of
| otherwise = zapped_v : go vs strs
where
zapped_v = zap_occ_info v
- evald_v = zapped_v `setIdUnfolding` mkOtherCon []
+ evald_v = zapped_v `setIdUnfolding` evaldUnfolding
go _ _ = pprPanic "cat_evals" (ppr dc $$ ppr vs $$ ppr strs)
-- If the case binder is alive, then we add the unfolding
bind_args env bs (drop n_drop_tys args) $ \ env ->
let
con_app = mkConApp dc (take n_drop_tys args ++ con_args)
- con_args = [substExpr (getSubst env) (varToCoreExpr b) | b <- bs]
+ con_args = [substExpr env (varToCoreExpr b) | b <- bs]
-- args are aready OutExprs, but bs are InIds
in
simplNonRecX env bndr con_app $ \ env ->
-- This has been this way for a long time, so I'll leave it,
-- but I can't convince myself that it's right.
--- gaw 2004
mkDupableCont env (Select _ case_bndr alts se cont)
= -- e.g. (case [...hole...] of { pi -> ei })
-- ===>
where
go env [] = returnSmpl (emptyFloats env, [])
go env (alt:alts)
- = mkDupableAlt env case_bndr' dupable_cont alt `thenSmpl` \ (floats1, alt') ->
- addFloats env floats1 $ \ env ->
- go env alts `thenSmpl` \ (floats2, alts') ->
- returnSmpl (floats2, alt' : alts')
+ = do { (floats1, mb_alt') <- mkDupableAlt env case_bndr' dupable_cont alt
+ ; addFloats env floats1 $ \ env -> do
+ { (floats2, alts') <- go env alts
+ ; returnSmpl (floats2, case mb_alt' of
+ Just alt' -> alt' : alts'
+ Nothing -> alts'
+ )}}
mkDupableAlt env case_bndr' cont alt
- = simplAlt env [] case_bndr' alt cont `thenSmpl` \ (mb_reft, (con, bndrs', rhs')) ->
+ = simplAlt env [] case_bndr' alt cont `thenSmpl` \ mb_stuff ->
+ case mb_stuff of {
+ Nothing -> returnSmpl (emptyFloats env, Nothing) ;
+
+ Just (reft, (con, bndrs', rhs')) ->
-- Safe to say that there are no handled-cons for the DEFAULT case
if exprIsDupable rhs' then
- returnSmpl (emptyFloats env, (con, bndrs', rhs'))
+ returnSmpl (emptyFloats env, Just (con, bndrs', rhs'))
-- It is worth checking for a small RHS because otherwise we
-- get extra let bindings that may cause an extra iteration of the simplifier to
-- inline back in place. Quite often the rhs is just a variable or constructor.
rhs_ty' = exprType rhs'
used_bndrs' = filter abstract_over (case_bndr' : bndrs')
abstract_over bndr
- | isTyVar bndr = not (mb_reft `refines` bndr)
+ | isTyVar bndr = not (bndr `elemVarEnv` reft)
-- Don't abstract over tyvar binders which are refined away
+ -- See Note [Refinement] below
| otherwise = not (isDeadBinder bndr)
-- The deadness info on the new Ids is preserved by simplBinders
- refines Nothing bndr = False
- refines (Just tv_subst) bndr = bndr `elemVarEnv` tv_subst
- -- See Note [Refinement] below
in
-- If we try to lift a primitive-typed something out
-- for let-binding-purposes, we will *caseify* it (!),
) `thenSmpl` \ (final_bndrs', final_args) ->
-- See comment about "$j" name above
- newId (encodeFS FSLIT("$j")) (mkPiTypes final_bndrs' rhs_ty') `thenSmpl` \ join_bndr ->
+ newId FSLIT("$j") (mkPiTypes final_bndrs' rhs_ty') `thenSmpl` \ join_bndr ->
-- Notice the funky mkPiTypes. If the contructor has existentials
-- it's possible that the join point will be abstracted over
-- type varaibles as well as term variables.
join_rhs = mkLams really_final_bndrs rhs'
join_call = mkApps (Var join_bndr) final_args
in
- returnSmpl (unitFloat env join_bndr join_rhs, (con, bndrs', join_call))
+ returnSmpl (unitFloat env join_bndr join_rhs, Just (con, bndrs', join_call)) }
\end{code}
Note [Refinement]
projects / ghc-hetmet.git / blobdiff