- SimplGently { sm_inline = inlining_on }
- -> inlining_on && isEarlyActive act
- -- See Note [Gentle mode]
-
- -- NB: we used to have a second exception, for data con wrappers.
- -- On the grounds that we use gentle mode for rule LHSs, and
- -- they match better when data con wrappers are inlined.
- -- But that only really applies to the trivial wrappers (like (:)),
- -- and they are now constructed as Compulsory unfoldings (in MkId)
- -- so they'll happen anyway.
-
- SimplPhase n _ -> isActive n act
+ SimplGently { sm_inline = False } -> active_unfolding_minimal
+ SimplGently { sm_inline = True } -> active_unfolding_gentle
+ SimplPhase n _ -> active_unfolding n
+
+activeUnfInRule :: SimplEnv -> IdUnfoldingFun
+-- When matching in RULE, we want to "look through" an unfolding
+-- if *rules* are on, even if *inlinings* are not. A notable example
+-- is DFuns, which really we want to match in rules like (op dfun)
+-- in gentle mode.
+activeUnfInRule env
+ = case getMode env of
+ SimplGently { sm_rules = False } -> active_unfolding_minimal
+ SimplGently { sm_rules = True } -> active_unfolding_gentle
+ SimplPhase n _ -> active_unfolding n
+
+active_unfolding_minimal :: IdUnfoldingFun
+-- Compuslory unfoldings only
+-- Ignore SimplGently, because we want to inline regardless;
+-- the Id has no top-level binding at all
+--
+-- NB: we used to have a second exception, for data con wrappers.
+-- On the grounds that we use gentle mode for rule LHSs, and
+-- they match better when data con wrappers are inlined.
+-- But that only really applies to the trivial wrappers (like (:)),
+-- and they are now constructed as Compulsory unfoldings (in MkId)
+-- so they'll happen anyway.
+active_unfolding_minimal id
+ | isCompulsoryUnfolding unf = unf
+ | otherwise = NoUnfolding