(** Injections on registers *)

  Definition reg_ren f (r:PregEq.t) (rs rs' : regset) : Prop :=
    val_obs f (Pregmap.get r rs) (Pregmap.get r rs').Definition regset_ren f rs rs' : Prop :=
    forall r, reg_ren f r rs rs'.Definition core_inj f c c' :=
    match c, c' with State rs _, State rs' _ => regset_ren f rs rs' end.

Lemma regset_ren_set_res: forall f br rs rs' v v' (Hrs_ren: regset_ren f rs rs') (Hval_obs: val_obs f v v'), regset_ren f (set_res br v rs) (set_res br v' rs').