- let
- n_val_args = length arg_infos
- saturated = n_val_args >= uf_arity
-
- result | yes_or_no = Just unf_template
- | otherwise = Nothing
-
- interesting_args = any nonTriv arg_infos
- -- NB: (any nonTriv arg_infos) looks at the
- -- over-saturated args too which is "wrong";
- -- but if over-saturated we inline anyway.
-
- -- some_benefit is used when the RHS is small enough
- -- and the call has enough (or too many) value
- -- arguments (ie n_val_args >= arity). But there must
- -- be *something* interesting about some argument, or the
- -- result context, to make it worth inlining
- some_benefit
- | not saturated = interesting_args -- Under-saturated
- -- Note [Unsaturated applications]
- | n_val_args > uf_arity = True -- Over-saturated
- | otherwise = interesting_args -- Saturated
- || interesting_saturated_call
-
- interesting_saturated_call
- = case cont_info of
- 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]
-
- (yes_or_no, extra_doc)
- = case guidance of
- UnfNever -> (False, empty)
-
- UnfWhen unsat_ok boring_ok
- -> (enough_args && (boring_ok || some_benefit), empty )
- where -- See Note [INLINE for small functions]
- enough_args = saturated || (unsat_ok && n_val_args > 0)
-
- UnfIfGoodArgs { ug_args = arg_discounts, ug_res = res_discount, ug_size = size }
- -> ( is_cheap && some_benefit && small_enough
- , (text "discounted size =" <+> int discounted_size) )
- where
- discounted_size = size - discount
- small_enough = discounted_size <= opt_UF_UseThreshold
- discount = computeDiscount uf_arity arg_discounts
- res_discount arg_infos cont_info
-
- in
- if (dopt Opt_D_dump_inlinings dflags && dopt Opt_D_verbose_core2core dflags) then
- pprTrace ("Considering inlining: " ++ showSDoc (ppr id))