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Visit an arrow's argument types without a closure #9286

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1 change: 1 addition & 0 deletions changes/iter-arg-types.polish.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
- Walk the parameters of a function type without allocating a closure, so the compiler allocates about 0.2% less.
9 changes: 8 additions & 1 deletion compiler/ml/btype.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -240,11 +240,18 @@ let rec iter_row f row =
Misc.may (fun (_, l) -> List.iter f l) row.row_name
| _ -> assert false

(* Not [List.iter] with a closure, which would be allocated at every arrow. *)
let rec iter_arg_types f = function
| [] -> ()
| {typ} :: params ->
f typ;
iter_arg_types f params

let iter_type_expr f ty =
match ty.desc with
| Tvar _ -> ()
| Tarrow (params, ret) ->
List.iter (fun {typ} -> f typ) params;
iter_arg_types f params;
f ret
| Ttuple l -> List.iter f l
| Tconstr (_, l, _) -> List.iter f l
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