(** Global variables mentioned in an operation or addressing mode *)

Definition globals_addressing (addr: addressing) : list ident :=
  match addr with
  | Aglobal s ofs => s :: nil
  | _ => nil
  end.Definition globals_operation (op: operation) : list ident :=
  match op with
  | Oaddrsymbol s ofs => s :: nil
  | _ => nil
  end.

Lemma eval_operation_preserved: forall sp op vl m, eval_operation ge2 sp op vl m = eval_operation ge1 sp op vl m.