(** Translation of arithmetic operations. *)
Ltac TranslOpSimpl :=
econstructor; split;
[ apply exec_straight_one; [simpl; eauto | reflexivity ]
| split; [try rewrite transl_shift_correct; repeat Simpl | intros; repeat Simpl] ].

Lemma transl_op_correct:
forall op args res k c (rs: regset) m v,
transl_op op args res k = OK c ->
eval_operation ge rs#IR13 op (map rs (map preg_of args)) m = Some v ->
exists rs',
exec_straight ge fn c rs m k rs' m
/\ Val.lessdef v rs'#(preg_of res)
/\ forall r, data_preg r = true -> r <> preg_of res -> preg_notin r (destroyed_by_op op) -> rs'#r = rs#r.