X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FcoreSyn%2FCoreUnfold.lhs;h=5883013a06d69ba760312bcf610d7d99665ebee8;hb=cd54b707b0d77a3c62ee9f57b82dae98727f1c34;hp=06a2d72603acdf6afd8faad8f506f202ad133506;hpb=3e0a7b9fbc16e432efa562df027d189fa274943a;p=ghc-hetmet.git diff --git a/compiler/coreSyn/CoreUnfold.lhs b/compiler/coreSyn/CoreUnfold.lhs index 06a2d72..5883013 100644 --- a/compiler/coreSyn/CoreUnfold.lhs +++ b/compiler/coreSyn/CoreUnfold.lhs @@ -60,6 +60,7 @@ import PrelNames import VarEnv ( mkInScopeSet ) import Bag import Util +import Pair import FastTypes import FastString import Outputable @@ -107,7 +108,7 @@ mkWwInlineRule id expr arity mkCompulsoryUnfolding :: CoreExpr -> Unfolding mkCompulsoryUnfolding expr -- Used for things that absolutely must be unfolded = mkCoreUnfolding InlineCompulsory True - expr 0 -- Arity of unfolding doesn't matter + (simpleOptExpr expr) 0 -- Arity of unfolding doesn't matter (UnfWhen unSaturatedOk boringCxtOk) mkInlineUnfolding :: Maybe Arity -> CoreExpr -> Unfolding @@ -348,11 +349,13 @@ sizeExpr bOMB_OUT_SIZE top_args expr size_up (Cast e _) = size_up e size_up (Note _ e) = size_up e size_up (Type _) = sizeZero -- Types cost nothing + size_up (Coercion _) = sizeZero size_up (Lit lit) = sizeN (litSize lit) size_up (Var f) = size_up_call f [] -- Make sure we get constructor -- discounts even on nullary constructors size_up (App fun (Type _)) = size_up fun + size_up (App fun (Coercion _)) = size_up fun size_up (App fun arg) = size_up arg `addSizeNSD` size_up_app fun [arg] @@ -408,7 +411,7 @@ sizeExpr bOMB_OUT_SIZE top_args expr ------------ -- size_up_app is used when there's ONE OR MORE value args size_up_app (App fun arg) args - | isTypeArg arg = size_up_app fun args + | isTyCoArg arg = size_up_app fun args | otherwise = size_up arg `addSizeNSD` size_up_app fun (arg:args) size_up_app (Var fun) args = size_up_call fun args @@ -783,21 +786,21 @@ callSiteInline dflags id active_unfolding lone_variable arg_infos cont_info -- be a loop breaker (maybe the knot is not yet untied) CoreUnfolding { uf_tmpl = unf_template, uf_is_top = is_top , uf_is_cheap = is_cheap, uf_arity = uf_arity - , uf_guidance = guidance } + , uf_guidance = guidance, uf_expandable = is_exp } | active_unfolding -> tryUnfolding dflags id lone_variable arg_infos cont_info unf_template is_top - is_cheap uf_arity guidance + is_cheap is_exp uf_arity guidance | otherwise -> Nothing NoUnfolding -> Nothing OtherCon {} -> Nothing DFunUnfolding {} -> Nothing -- Never unfold a DFun tryUnfolding :: DynFlags -> Id -> Bool -> [ArgSummary] -> CallCtxt - -> CoreExpr -> Bool -> Bool -> Arity -> UnfoldingGuidance + -> CoreExpr -> Bool -> Bool -> Bool -> Arity -> UnfoldingGuidance -> Maybe CoreExpr tryUnfolding dflags id lone_variable arg_infos cont_info unf_template is_top - is_cheap uf_arity guidance + is_cheap is_exp uf_arity guidance -- uf_arity will typically be equal to (idArity id), -- but may be less for InlineRules | dopt Opt_D_dump_inlinings dflags && dopt Opt_D_verbose_core2core dflags @@ -806,6 +809,7 @@ tryUnfolding dflags id lone_variable text "uf arity" <+> ppr uf_arity, text "interesting continuation" <+> ppr cont_info, text "some_benefit" <+> ppr some_benefit, + text "is exp:" <+> ppr is_exp, text "is cheap:" <+> ppr is_cheap, text "guidance" <+> ppr guidance, extra_doc, @@ -839,10 +843,10 @@ tryUnfolding dflags id lone_variable interesting_saturated_call = case cont_info of - BoringCtxt -> not is_top && uf_arity > 0 -- Note [Nested functions] + BoringCtxt -> not is_top && uf_arity > 0 -- Note [Nested functions] CaseCtxt -> not (lone_variable && is_cheap) -- Note [Lone variables] - ArgCtxt {} -> uf_arity > 0 -- Note [Inlining in ArgCtxt] - ValAppCtxt -> True -- Note [Cast then apply] + ArgCtxt {} -> uf_arity > 0 -- Note [Inlining in ArgCtxt] + ValAppCtxt -> True -- Note [Cast then apply] (yes_or_no, extra_doc) = case guidance of @@ -1146,12 +1150,14 @@ interestingArg e = go e 0 conlike_unfolding = isConLikeUnfolding (idUnfolding v) go (Type _) _ = TrivArg - go (App fn (Type _)) n = go fn n + go (Coercion _) _ = TrivArg + go (App fn (Type _)) n = go fn n + go (App fn (Coercion _)) n = go fn n go (App fn _) n = go fn (n+1) go (Note _ a) n = go a n go (Cast e _) n = go e n go (Lam v e) n - | isTyCoVar v = go e n + | isTyVar v = go e n | n>0 = go e (n-1) | otherwise = ValueArg go (Let _ e) n = case go e n of { ValueArg -> ValueArg; _ -> NonTrivArg } @@ -1207,7 +1213,7 @@ exprIsConApp_maybe id_unf (Cast expr co) Nothing -> Nothing ; Just (dc, _dc_univ_args, dc_args) -> - let (_from_ty, to_ty) = coercionKind co + let Pair _from_ty to_ty = coercionKind co dc_tc = dataConTyCon dc in case splitTyConApp_maybe to_ty of { @@ -1227,41 +1233,28 @@ exprIsConApp_maybe id_unf (Cast expr co) dc_ex_tyvars = dataConExTyVars dc arg_tys = dataConRepArgTys dc - dc_eqs :: [(Type,Type)] -- All equalities from the DataCon - dc_eqs = [(mkTyVarTy tv, ty) | (tv,ty) <- dataConEqSpec dc] ++ - [getEqPredTys eq_pred | eq_pred <- dataConEqTheta dc] - - (ex_args, rest1) = splitAtList dc_ex_tyvars dc_args - (co_args, val_args) = splitAtList dc_eqs rest1 + (ex_args, val_args) = splitAtList dc_ex_tyvars dc_args -- Make the "theta" from Fig 3 of the paper gammas = decomposeCo tc_arity co - theta = zipOpenTvSubst (dc_univ_tyvars ++ dc_ex_tyvars) - (gammas ++ stripTypeArgs ex_args) - - -- Cast the existential coercion arguments - cast_co (ty1, ty2) (Type co) - = Type $ mkSymCoercion (substTy theta ty1) - `mkTransCoercion` co - `mkTransCoercion` (substTy theta ty2) - cast_co _ other_arg = pprPanic "cast_co" (ppr other_arg) - new_co_args = zipWith cast_co dc_eqs co_args - + theta = zipOpenCvSubst (dc_univ_tyvars ++ dc_ex_tyvars) + (gammas ++ map mkReflCo (stripTypeArgs ex_args)) + -- Cast the value arguments (which include dictionaries) new_val_args = zipWith cast_arg arg_tys val_args - cast_arg arg_ty arg = mkCoerce (substTy theta arg_ty) arg + cast_arg arg_ty arg = mkCoerce (liftCoSubst theta arg_ty) arg in #ifdef DEBUG let dump_doc = vcat [ppr dc, ppr dc_univ_tyvars, ppr dc_ex_tyvars, ppr arg_tys, ppr dc_args, ppr _dc_univ_args, ppr ex_args, ppr val_args] in - ASSERT2( coreEqType _from_ty (mkTyConApp dc_tc _dc_univ_args), dump_doc ) - ASSERT2( all isTypeArg (ex_args ++ co_args), dump_doc ) + ASSERT2( eqType _from_ty (mkTyConApp dc_tc _dc_univ_args), dump_doc ) + ASSERT2( all isTypeArg ex_args, dump_doc ) ASSERT2( equalLength val_args arg_tys, dump_doc ) #endif - Just (dc, to_tc_arg_tys, ex_args ++ new_co_args ++ new_val_args) + Just (dc, to_tc_arg_tys, ex_args ++ new_val_args) }} exprIsConApp_maybe id_unf expr @@ -1300,7 +1293,7 @@ exprIsConApp_maybe id_unf expr ----------- beta (Lam v body) pairs (arg : args) - | isTypeArg arg + | isTyCoArg arg = beta body ((v,arg):pairs) args beta (Lam {}) _ _ -- Un-saturated, or not a type lambda @@ -1312,10 +1305,10 @@ exprIsConApp_maybe id_unf expr subst = mkOpenSubst (mkInScopeSet (exprFreeVars fun)) pairs -- doc = vcat [ppr fun, ppr expr, ppr pairs, ppr args] - stripTypeArgs :: [CoreExpr] -> [Type] stripTypeArgs args = ASSERT2( all isTypeArg args, ppr args ) [ty | Type ty <- args] + -- We really do want isTypeArg here, not isTyCoArg! \end{code} Note [Unfolding DFuns]