(** As a corollary, we show that all sources of [parmove mu] are sources of [mu] or temporaries, and likewise all destinations of [parmove mu] are destinations of [mu] or temporaries. *)
Remark wf_move_initial_reg_or_temp:
forall mu s d,
wf_move mu s d ->
(In s (srcs mu) \/ is_temp s) /\ (In d (dests mu) \/ is_temp d).

Lemma parmove_initial_reg_or_temp:
forall mu s d,
In (s, d) (parmove mu) ->
(In s (srcs mu) \/ is_temp s) /\ (In d (dests mu) \/ is_temp d).