[Git][ghc/ghc][wip/tyconapp-opts] Optimise nullary type constructor usage
Ben Gamari
gitlab at gitlab.haskell.org
Fri Nov 13 17:31:38 UTC 2020
Ben Gamari pushed to branch wip/tyconapp-opts at Glasgow Haskell Compiler / GHC
Commits:
041b16b2 by Ben Gamari at 2020-11-13T12:31:24-05:00
Optimise nullary type constructor usage
During the compilation of programs GHC very frequently deals with
the `Type` type, which is a synonym of `TYPE 'LiftedRep`. This patch
teaches GHC to avoid expanding the `Type` synonym (and other nullary
type synonyms) during type comparisons, saving a good amount of work.
This optimisation is described in `Note [Comparing nullary type
synonyms]`.
To maximize the impact of this optimisation, we introduce a few
special-cases to reduce `TYPE 'LiftedRep` to `Type`. See
`Note [Prefer Type over TYPE 'LiftedPtrRep]`.
Closes #17958.
Metric Decrease:
T18698b
T1969
T12227
T12545
T12707
T14683
T3064
T5631
T5642
T9020
T9872a
T13035
haddock.Cabal
haddock.base
- - - - -
22 changed files:
- compiler/GHC/Builtin/Types.hs
- compiler/GHC/Builtin/Types/Prim.hs
- + compiler/GHC/Builtin/Types/Prim.hs-boot
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Tc/Solver/Canonical.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- compiler/GHC/Tc/Utils/TcType.hs
- testsuite/tests/deSugar/should_compile/T2431.stderr
- testsuite/tests/deriving/should_compile/T14578.stderr
- testsuite/tests/plugins/plugins09.stdout
- testsuite/tests/plugins/plugins10.stdout
- testsuite/tests/plugins/plugins11.stdout
- testsuite/tests/plugins/static-plugins.stdout
- testsuite/tests/printer/T18052a.stderr
- testsuite/tests/simplCore/should_compile/T13143.stderr
- testsuite/tests/simplCore/should_compile/T18013.stderr
- testsuite/tests/simplCore/should_compile/T7360.stderr
- testsuite/tests/typecheck/should_compile/T13032.stderr
Changes:
=====================================
compiler/GHC/Builtin/Types.hs
=====================================
@@ -170,6 +170,7 @@ import GHC.Types.Var (VarBndr (Bndr))
import GHC.Settings.Constants ( mAX_TUPLE_SIZE, mAX_CTUPLE_SIZE, mAX_SUM_SIZE )
import GHC.Unit.Module ( Module )
import GHC.Core.Type
+import qualified GHC.Core.TyCo.Rep as TyCoRep (Type(TyConApp))
import GHC.Types.RepType
import GHC.Core.DataCon
import GHC.Core.ConLike
@@ -691,7 +692,7 @@ constraintKindTyCon :: TyCon
constraintKindTyCon = pcTyCon constraintKindTyConName Nothing [] []
liftedTypeKind, typeToTypeKind, constraintKind :: Kind
-liftedTypeKind = tYPE liftedRepTy
+liftedTypeKind = TyCoRep.TyConApp liftedTypeKindTyCon []
typeToTypeKind = liftedTypeKind `mkVisFunTyMany` liftedTypeKind
constraintKind = mkTyConApp constraintKindTyCon []
@@ -1415,8 +1416,8 @@ runtimeRepTy = mkTyConTy runtimeRepTyCon
-- type Type = tYPE 'LiftedRep
liftedTypeKindTyCon :: TyCon
liftedTypeKindTyCon = buildSynTyCon liftedTypeKindTyConName
- [] liftedTypeKind []
- (tYPE liftedRepTy)
+ [] liftedTypeKind [] rhs
+ where rhs = TyCoRep.TyConApp tYPETyCon [liftedRepTy]
runtimeRepTyCon :: TyCon
runtimeRepTyCon = pcTyCon runtimeRepTyConName Nothing []
=====================================
compiler/GHC/Builtin/Types/Prim.hs
=====================================
@@ -551,10 +551,6 @@ mkPrimTcName built_in_syntax occ key tycon
= mkWiredInName gHC_PRIM (mkTcOccFS occ) key (mkATyCon tycon) built_in_syntax
-----------------------------
--- | Given a RuntimeRep, applies TYPE to it.
--- see Note [TYPE and RuntimeRep]
-tYPE :: Type -> Type
-tYPE rr = TyConApp tYPETyCon [rr]
-- Given a Multiplicity, applies FUN to it.
functionWithMultiplicity :: Type -> Type
=====================================
compiler/GHC/Builtin/Types/Prim.hs-boot
=====================================
@@ -0,0 +1,5 @@
+module GHC.Builtin.Types.Prim where
+
+import GHC.Core.TyCon
+
+tYPETyCon :: TyCon
=====================================
compiler/GHC/Core/TyCo/Rep.hs
=====================================
@@ -52,6 +52,7 @@ module GHC.Core.TyCo.Rep (
mkVisFunTyMany, mkVisFunTysMany,
mkInvisFunTyMany, mkInvisFunTysMany,
mkTyConApp,
+ tYPE,
-- * Functions over binders
TyCoBinder(..), TyCoVarBinder, TyBinder,
@@ -90,8 +91,9 @@ import GHC.Core.TyCon
import GHC.Core.Coercion.Axiom
-- others
-import GHC.Builtin.Names ( liftedTypeKindTyConKey, manyDataConKey )
-import {-# SOURCE #-} GHC.Builtin.Types ( liftedTypeKindTyCon, manyDataConTy )
+import GHC.Builtin.Names ( liftedTypeKindTyConKey, liftedRepDataConKey, manyDataConKey, tYPETyConKey )
+import {-# SOURCE #-} GHC.Builtin.Types ( liftedTypeKindTyCon, liftedTypeKind, manyDataConTy )
+import {-# SOURCE #-} GHC.Builtin.Types.Prim ( tYPETyCon )
import GHC.Types.Basic ( LeftOrRight(..), pickLR )
import GHC.Types.Unique ( hasKey )
import GHC.Utils.Outputable
@@ -1018,12 +1020,64 @@ mkTyConApp tycon tys
-- avoid reboxing every time `mkTyConApp` is called.
= ASSERT2( null tys, ppr tycon $$ ppr tys )
manyDataConTy
+ -- See Note [Prefer Type over TYPE 'LiftedRep].
+ | tycon `hasKey` tYPETyConKey
+ , [rep] <- tys
+ = tYPE rep
+ -- The catch-all case
| otherwise
= TyConApp tycon tys
+{-
+Note [Prefer Type over TYPE 'LiftedRep]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The Core of nearly any program will have numerous occurrences of
+ at TYPE 'LiftedRep@ floating about. Consequently, we try hard to ensure
+that operations on such types are efficient. Specifically, we strive to
+
+ a. Avoid heap allocation of such types
+ b. Use a small (shallow in the tree-depth sense) representation
+ for such types
+
+Goal (b) is particularly useful as it makes traversals (e.g. free variable
+traversal, substitution, and comparison) more efficient.
+Comparison in particular takes special advantage of nullary type synonym
+applications, Note [Comparing nullary type synonyms] in "GHC.Core.Type".
+
+To accomplish these we use a number of tricks:
+
+ * Instead of representing the lifted kind as
+ @TyConApp tYPETyCon [liftedRepDataCon]@ we rather prefer to
+ use the 'GHC.Types.Type' type synonym. This serves goal (b)
+ since there are no applied type arguments to traverse, e.g., during
+ comparison.
+
+ * We have a top-level binding to represent `TyConApp GHC.Types.Type []`
+ (namely 'GHC.Builtin.Types.Prim.liftedTypeKind'), ensuring that we
+ don't need to allocate such types (goal (a)).
+
+ * To avoid allocating 'TyConApp' constructors
+ 'GHC.Builtin.Types.Prim.tYPE' catches the lifted case and returns
+ `liftedTypeKind` instead of building an application (goal (a)).
+
+ * Similarly, 'Type.mkTyConApp' catches applications of `TYPE` and
+ handles them using 'GHC.Builtin.Types.Prim.tYPE', ensuring
+ that it benefits from the optimisation described above (goal (a)).
+
+See #17958.
+-}
+
+-- | Given a RuntimeRep, applies TYPE to it.
+-- See Note [TYPE and RuntimeRep] in GHC.Builtin.Types.Prim.
+tYPE :: Type -> Type
+tYPE (TyConApp tc [])
+ -- See Note [Prefer Type of TYPE 'LiftedRep]
+ | tc `hasKey` liftedRepDataConKey = liftedTypeKind -- TYPE 'LiftedRep
+tYPE rr = TyConApp tYPETyCon [rr]
+
-- This is a single, global definition of the type `Type`
-- Defined here so it is only allocated once.
--- See Note [mkTyConApp and Type]
+-- See Note [mkTyConApp and Type] in this module.
liftedTypeKindTyConApp :: Type
liftedTypeKindTyConApp = TyConApp liftedTypeKindTyCon []
=====================================
compiler/GHC/Core/TyCo/Subst.hs
=====================================
@@ -424,6 +424,7 @@ zipTCvSubst tcvs tys
-- | Generates the in-scope set for the 'TCvSubst' from the types in the
-- incoming environment. No CoVars, please!
mkTvSubstPrs :: [(TyVar, Type)] -> TCvSubst
+mkTvSubstPrs [] = emptyTCvSubst
mkTvSubstPrs prs =
ASSERT2( onlyTyVarsAndNoCoercionTy, text "prs" <+> ppr prs )
mkTvSubst in_scope tenv
=====================================
compiler/GHC/Core/TyCon.hs
=====================================
@@ -2310,12 +2310,14 @@ expandSynTyCon_maybe
-- ^ Expand a type synonym application, if any
expandSynTyCon_maybe tc tys
| SynonymTyCon { tyConTyVars = tvs, synTcRhs = rhs, tyConArity = arity } <- tc
- = case tys `listLengthCmp` arity of
- GT -> Just (tvs `zip` tys, rhs, drop arity tys)
- EQ -> Just (tvs `zip` tys, rhs, [])
- LT -> Nothing
- | otherwise
- = Nothing
+ = case tys of
+ [] -> Just ([], rhs, []) -- Avoid a bit of work in the case of nullary synonyms
+ _ -> case tys `listLengthCmp` arity of
+ GT -> Just (tvs `zip` tys, rhs, drop arity tys)
+ EQ -> Just (tvs `zip` tys, rhs, [])
+ LT -> Nothing
+ | otherwise
+ = Nothing
----------------
=====================================
compiler/GHC/Core/Type.hs
=====================================
@@ -382,15 +382,16 @@ how roles in kinds might work out.
-}
-- | Gives the typechecker view of a type. This unwraps synonyms but
--- leaves 'Constraint' alone. c.f. coreView, which turns Constraint into
--- TYPE LiftedRep. Returns Nothing if no unwrapping happens.
+-- leaves 'Constraint' alone. c.f. 'coreView', which turns 'Constraint' into
+-- @TYPE LiftedRep at . Returns 'Nothing' if no unwrapping happens.
-- See also Note [coreView vs tcView]
{-# INLINE tcView #-}
tcView :: Type -> Maybe Type
-tcView (TyConApp tc tys) | Just (tenv, rhs, tys') <- expandSynTyCon_maybe tc tys
- = Just (mkAppTys (substTy (mkTvSubstPrs tenv) rhs) tys')
+tcView (TyConApp tc tys)
+ | res@(Just _) <- expandSynTyConApp_maybe tc tys
+ = res
-- The free vars of 'rhs' should all be bound by 'tenv', so it's
- -- ok to use 'substTy' here.
+ -- ok to use 'substTy' here (which is what expandSynTyConApp_maybe does).
-- See also Note [The substitution invariant] in GHC.Core.TyCo.Subst.
-- Its important to use mkAppTys, rather than (foldl AppTy),
-- because the function part might well return a
@@ -399,17 +400,16 @@ tcView _ = Nothing
{-# INLINE coreView #-}
coreView :: Type -> Maybe Type
--- ^ This function Strips off the /top layer only/ of a type synonym
+-- ^ This function strips off the /top layer only/ of a type synonym
-- application (if any) its underlying representation type.
--- Returns Nothing if there is nothing to look through.
+-- Returns 'Nothing' if there is nothing to look through.
-- This function considers 'Constraint' to be a synonym of @TYPE LiftedRep at .
--
-- By being non-recursive and inlined, this case analysis gets efficiently
-- joined onto the case analysis that the caller is already doing
coreView ty@(TyConApp tc tys)
- | Just (tenv, rhs, tys') <- expandSynTyCon_maybe tc tys
- = Just (mkAppTys (substTy (mkTvSubstPrs tenv) rhs) tys')
- -- This equation is exactly like tcView
+ | res@(Just _) <- expandSynTyConApp_maybe tc tys
+ = res
-- At the Core level, Constraint = Type
-- See Note [coreView vs tcView]
@@ -419,6 +419,30 @@ coreView ty@(TyConApp tc tys)
coreView _ = Nothing
+-----------------------------------------------
+expandSynTyConApp_maybe :: TyCon -> [Type] -> Maybe Type
+expandSynTyConApp_maybe tc tys
+ | Just (tvs, rhs) <- synTyConDefn_maybe tc
+ , n_tys <= arity
+ = Just (expand_syn arity tvs rhs n_tys tys)
+ | otherwise
+ = Nothing
+ where
+ n_tys = length tys
+ arity = tyConArity tc
+-- Without this INLINE the call to expandSynTyConApp_maybe in coreView
+-- will result in an avoidable allocation.
+{-# INLINE expandSynTyConApp_maybe #-}
+
+-- | A helper for 'expandSynTyConApp_maybe' to avoid inlining this cold path
+-- into call-sites.
+expand_syn :: Int -> [TyVar] -> Type -> Int -> [Type] -> Type
+expand_syn arity tvs rhs n_tys tys
+ | n_tys > arity = mkAppTys rhs' (drop arity tys)
+ | otherwise = rhs'
+ where
+ rhs' = substTy (mkTvSubstPrs (tvs `zip` tys)) rhs
+
{-# INLINE coreFullView #-}
coreFullView :: Type -> Type
-- ^ Iterates 'coreView' until there is no more to synonym to expand.
@@ -2194,6 +2218,36 @@ But the left is an AppTy while the right is a TyConApp. The solution is
to use repSplitAppTy_maybe to break up the TyConApp into its pieces and
then continue. Easy to do, but also easy to forget to do.
+
+Note [Comparing nullary type synonyms]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Consider the task of testing equality between two 'Type's of the form
+
+ TyConApp tc []
+
+where @tc@ is a type synonym. A naive way to perform this comparison these
+would first expand the synonym and then compare the resulting expansions.
+
+However, this is obviously wasteful and the RHS of @tc@ may be large; it is
+much better to rather compare the TyCons directly. Consequently, before
+expanding type synonyms in type comparisons we first look for a nullary
+TyConApp and simply compare the TyCons if we find one. Of course, if we find
+that the TyCons are *not* equal then we still need to perform the expansion as
+their RHSs may still be equal.
+
+We perform this optimisation in a number of places:
+
+ * GHC.Core.Types.eqType
+ * GHC.Core.Types.nonDetCmpType
+ * GHC.Core.Unify.unify_ty
+ * TcCanonical.can_eq_nc'
+ * TcUnify.uType
+
+This optimisation is especially helpful for the ubiquitous GHC.Types.Type,
+since GHC prefers to use the type synonym over @TYPE 'LiftedRep@ applications
+whenever possible. See [Prefer Type over TYPE 'LiftedRep] in
+GHC.Core.TyCo.Rep for details.
+
-}
eqType :: Type -> Type -> Bool
@@ -2305,6 +2359,10 @@ nonDetCmpTypeX env orig_t1 orig_t2 =
-- Returns both the resulting ordering relation between the two types
-- and whether either contains a cast.
go :: RnEnv2 -> Type -> Type -> TypeOrdering
+ -- See Note [Comparing nullary type synonyms].
+ go _ (TyConApp tc1 []) (TyConApp tc2 [])
+ | tc1 == tc2
+ = TEQ
go env t1 t2
| Just t1' <- coreView t1 = go env t1' t2
| Just t2' <- coreView t2 = go env t1 t2'
=====================================
compiler/GHC/Core/Unify.hs
=====================================
@@ -957,7 +957,12 @@ unify_ty :: UMEnv
-- Respects newtypes, PredTypes
unify_ty env ty1 ty2 kco
- -- Use tcView, not coreView. See Note [coreView vs tcView] in GHC.Core.Type.
+ -- See Note [Comparing nullary type synonyms] in GHC.Core.Type.
+ | TyConApp tc1 [] <- ty1
+ , TyConApp tc2 [] <- ty2
+ , tc1 == tc2 = return ()
+
+ -- TODO: More commentary needed here
| Just ty1' <- tcView ty1 = unify_ty env ty1' ty2 kco
| Just ty2' <- tcView ty2 = unify_ty env ty1 ty2' kco
| CastTy ty1' co <- ty1 = if um_unif env
=====================================
compiler/GHC/Tc/Solver/Canonical.hs
=====================================
@@ -961,6 +961,11 @@ can_eq_nc'
-> Type -> Type -- RHS, after and before type-synonym expansion, resp
-> TcS (StopOrContinue Ct)
+-- See Note [Comparing nullary type synonyms] in GHC.Core.Type.
+can_eq_nc' _flat _rdr_env _envs ev eq_rel ty1@(TyConApp tc1 []) _ps_ty1 (TyConApp tc2 []) _ps_ty2
+ | tc1 == tc2
+ = canEqReflexive ev eq_rel ty1
+
-- Expand synonyms first; see Note [Type synonyms and canonicalization]
can_eq_nc' flat rdr_env envs ev eq_rel ty1 ps_ty1 ty2 ps_ty2
| Just ty1' <- tcView ty1 = can_eq_nc' flat rdr_env envs ev eq_rel ty1' ps_ty1 ty2 ps_ty2
=====================================
compiler/GHC/Tc/Utils/TcMType.hs
=====================================
@@ -120,7 +120,6 @@ import GHC.Types.Id as Id
import GHC.Types.Name
import GHC.Types.Var.Set
import GHC.Builtin.Types
-import GHC.Builtin.Types.Prim
import GHC.Types.Var.Env
import GHC.Types.Name.Env
import GHC.Utils.Misc
=====================================
compiler/GHC/Tc/Utils/TcType.hs
=====================================
@@ -1545,6 +1545,11 @@ tc_eq_type keep_syns vis_only orig_ty1 orig_ty2
= go orig_env orig_ty1 orig_ty2
where
go :: RnEnv2 -> Type -> Type -> Bool
+ -- See Note [Comparing nullary type synonyms] in GHC.Core.Type.
+ go _ (TyConApp tc1 []) (TyConApp tc2 [])
+ | tc1 == tc2
+ = True
+
go env t1 t2 | not keep_syns, Just t1' <- tcView t1 = go env t1' t2
go env t1 t2 | not keep_syns, Just t2' <- tcView t2 = go env t1 t2'
=====================================
testsuite/tests/deSugar/should_compile/T2431.stderr
=====================================
@@ -1,9 +1,9 @@
==================== Tidy Core ====================
Result size of Tidy Core
- = {terms: 63, types: 43, coercions: 1, joins: 0/0}
+ = {terms: 63, types: 39, coercions: 1, joins: 0/0}
--- RHS size: {terms: 2, types: 4, coercions: 1, joins: 0/0}
+-- RHS size: {terms: 2, types: 3, coercions: 1, joins: 0/0}
T2431.$WRefl [InlPrag=INLINE[final] CONLIKE] :: forall a. a :~: a
[GblId[DataConWrapper],
Caf=NoCafRefs,
@@ -15,7 +15,7 @@ T2431.$WRefl [InlPrag=INLINE[final] CONLIKE] :: forall a. a :~: a
T2431.$WRefl
= \ (@a) -> T2431.Refl @a @a @~(<a>_N :: a GHC.Prim.~# a)
--- RHS size: {terms: 4, types: 8, coercions: 0, joins: 0/0}
+-- RHS size: {terms: 4, types: 7, coercions: 0, joins: 0/0}
absurd :: forall a. (Int :~: Bool) -> a
[GblId, Arity=1, Str=<L,U>b, Cpr=b, Unf=OtherCon []]
absurd = \ (@a) (x :: Int :~: Bool) -> case x of { }
=====================================
testsuite/tests/deriving/should_compile/T14578.stderr
=====================================
@@ -16,13 +16,12 @@ Derived class instances:
= GHC.Prim.coerce
@(T14578.App (Data.Functor.Compose.Compose f g) a
-> T14578.App (Data.Functor.Compose.Compose f g) a
- -> T14578.App (Data.Functor.Compose.Compose f g) a)
+ -> T14578.App (Data.Functor.Compose.Compose f g) a)
@(T14578.Wat f g a -> T14578.Wat f g a -> T14578.Wat f g a)
((GHC.Base.<>) @(T14578.App (Data.Functor.Compose.Compose f g) a))
GHC.Base.sconcat
= GHC.Prim.coerce
- @(GHC.Base.NonEmpty
- (T14578.App (Data.Functor.Compose.Compose f g) a)
+ @(GHC.Base.NonEmpty (T14578.App (Data.Functor.Compose.Compose f g) a)
-> T14578.App (Data.Functor.Compose.Compose f g) a)
@(GHC.Base.NonEmpty (T14578.Wat f g a) -> T14578.Wat f g a)
(GHC.Base.sconcat
@@ -31,7 +30,7 @@ Derived class instances:
= GHC.Prim.coerce
@(b
-> T14578.App (Data.Functor.Compose.Compose f g) a
- -> T14578.App (Data.Functor.Compose.Compose f g) a)
+ -> T14578.App (Data.Functor.Compose.Compose f g) a)
@(b -> T14578.Wat f g a -> T14578.Wat f g a)
(GHC.Base.stimes
@(T14578.App (Data.Functor.Compose.Compose f g) a))
=====================================
testsuite/tests/plugins/plugins09.stdout
=====================================
@@ -3,6 +3,5 @@ interfacePlugin: Prelude
interfacePlugin: GHC.Float
interfacePlugin: GHC.Base
typeCheckPlugin (rn)
-interfacePlugin: GHC.Types
typeCheckPlugin (tc)
interfacePlugin: GHC.Num.BigNat
=====================================
testsuite/tests/plugins/plugins10.stdout
=====================================
@@ -6,7 +6,6 @@ interfacePlugin: GHC.Float
interfacePlugin: GHC.Base
interfacePlugin: Language.Haskell.TH.Syntax
typeCheckPlugin (rn)
-interfacePlugin: GHC.Types
typeCheckPlugin (tc)
interfacePlugin: GHC.Num.BigNat
parsePlugin(a)
=====================================
testsuite/tests/plugins/plugins11.stdout
=====================================
@@ -3,6 +3,5 @@ interfacePlugin: Prelude
interfacePlugin: GHC.Float
interfacePlugin: GHC.Base
typeCheckPlugin (rn)
-interfacePlugin: GHC.Types
typeCheckPlugin (tc)
interfacePlugin: GHC.Num.BigNat
=====================================
testsuite/tests/plugins/static-plugins.stdout
=====================================
@@ -5,11 +5,11 @@ interfacePlugin: GHC.Float
interfacePlugin: GHC.Base
interfacePlugin: System.IO
typeCheckPlugin (rn)
-interfacePlugin: GHC.Prim
-interfacePlugin: GHC.Show
interfacePlugin: GHC.Types
+interfacePlugin: GHC.Show
interfacePlugin: GHC.TopHandler
typeCheckPlugin (tc)
+interfacePlugin: GHC.Prim
interfacePlugin: GHC.CString
interfacePlugin: GHC.Num.BigNat
==pure.1
=====================================
testsuite/tests/printer/T18052a.stderr
=====================================
@@ -10,9 +10,9 @@ Dependent packages: [base-4.16.0.0, ghc-bignum-1.0, ghc-prim-0.7.0]
==================== Tidy Core ====================
Result size of Tidy Core
- = {terms: 24, types: 61, coercions: 0, joins: 0/0}
+ = {terms: 24, types: 52, coercions: 0, joins: 0/0}
--- RHS size: {terms: 7, types: 8, coercions: 0, joins: 0/0}
+-- RHS size: {terms: 7, types: 6, coercions: 0, joins: 0/0}
T18052a.$b:||: :: forall {a} {b}. a -> b -> (a, b)
[GblId, Arity=2, Unf=OtherCon []]
T18052a.$b:||: = \ (@a) (@b) (x :: a) (y :: b) -> (x, y)
@@ -22,7 +22,7 @@ T18052a.$b:||: = \ (@a) (@b) (x :: a) (y :: b) -> (x, y)
[GblId]
(+++) = ++
--- RHS size: {terms: 13, types: 20, coercions: 0, joins: 0/0}
+-- RHS size: {terms: 13, types: 18, coercions: 0, joins: 0/0}
T18052a.$m:||:
:: forall {rep :: GHC.Types.RuntimeRep} {r :: TYPE rep} {a} {b}.
(a, b) -> (a -> b -> r) -> ((# #) -> r) -> r
=====================================
testsuite/tests/simplCore/should_compile/T13143.stderr
=====================================
@@ -1,17 +1,17 @@
==================== Tidy Core ====================
Result size of Tidy Core
- = {terms: 71, types: 44, coercions: 0, joins: 0/0}
+ = {terms: 71, types: 40, coercions: 0, joins: 0/0}
Rec {
--- RHS size: {terms: 4, types: 4, coercions: 0, joins: 0/0}
+-- RHS size: {terms: 4, types: 3, coercions: 0, joins: 0/0}
T13143.$wf [InlPrag=NOINLINE, Occ=LoopBreaker]
:: forall {a}. (# #) -> a
[GblId, Arity=1, Str=<B,A>b, Cpr=b, Unf=OtherCon []]
T13143.$wf = \ (@a) _ [Occ=Dead] -> T13143.$wf @a GHC.Prim.(##)
end Rec }
--- RHS size: {terms: 4, types: 4, coercions: 0, joins: 0/0}
+-- RHS size: {terms: 4, types: 3, coercions: 0, joins: 0/0}
f [InlPrag=[final]] :: forall a. Int -> a
[GblId,
Arity=1,
=====================================
testsuite/tests/simplCore/should_compile/T18013.stderr
=====================================
@@ -129,9 +129,9 @@ Rule fired: Class op fmap (BUILTIN)
==================== Tidy Core ====================
Result size of Tidy Core
- = {terms: 52, types: 106, coercions: 17, joins: 0/1}
+ = {terms: 52, types: 101, coercions: 17, joins: 0/1}
--- RHS size: {terms: 37, types: 87, coercions: 17, joins: 0/1}
+-- RHS size: {terms: 37, types: 84, coercions: 17, joins: 0/1}
mapMaybeRule
:: forall a b. Rule IO a b -> Rule IO (Maybe a) (Maybe b)
[GblId,
=====================================
testsuite/tests/simplCore/should_compile/T7360.stderr
=====================================
@@ -1,7 +1,7 @@
==================== Tidy Core ====================
Result size of Tidy Core
- = {terms: 106, types: 47, coercions: 0, joins: 0/0}
+ = {terms: 106, types: 45, coercions: 0, joins: 0/0}
-- RHS size: {terms: 6, types: 3, coercions: 0, joins: 0/0}
T7360.$WFoo3 [InlPrag=INLINE[final] CONLIKE] :: Int %1 -> Foo
@@ -31,7 +31,7 @@ T7360.fun4 :: ()
WorkFree=False, Expandable=False, Guidance=IF_ARGS [] 20 0}]
T7360.fun4 = fun1 T7360.Foo1
--- RHS size: {terms: 11, types: 8, coercions: 0, joins: 0/0}
+-- RHS size: {terms: 11, types: 7, coercions: 0, joins: 0/0}
fun2 :: forall {a}. [a] -> ((), Int)
[GblId,
Arity=1,
=====================================
testsuite/tests/typecheck/should_compile/T13032.stderr
=====================================
@@ -1,9 +1,9 @@
==================== Desugar (after optimization) ====================
Result size of Desugar (after optimization)
- = {terms: 13, types: 24, coercions: 0, joins: 0/0}
+ = {terms: 13, types: 18, coercions: 0, joins: 0/0}
--- RHS size: {terms: 6, types: 11, coercions: 0, joins: 0/0}
+-- RHS size: {terms: 6, types: 8, coercions: 0, joins: 0/0}
f :: forall a b. (a ~ b) => a -> b -> Bool
[LclIdX,
Unf=Unf{Src=<vanilla>, TopLvl=True, Value=True, ConLike=True,
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/041b16b2f64ad96335eda5bd8b1ba6acd329371b
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/041b16b2f64ad96335eda5bd8b1ba6acd329371b
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