(*Lemma eval_binop_lessdef: forall op v1 v1' v2 v2' v m m', eval_binop op v1 v2 m = Some v -> Val.lessdef v1 v1' -> Val.lessdef v2 v2' -> Mem.extends m m' -> exists v', eval_binop op v1' v2' m' = Some v' /\ Val.lessdef v v'. *)
(** Lenb: same for binops Compatibility of [eval_binop] with respect to [val_inject]. *)
(*Lenb: fom Cminorgenproof: *)
Remark val_inject_val_of_bool:
forall f b, val_inject f (Val.of_bool b) (Val.of_bool b).
(*Lenb: fom Cminorgenproof: *)
Remark val_inject_val_of_optbool:
forall f ob, val_inject f (Val.of_optbool ob) (Val.of_optbool ob).
(*Lenb: fom Cminorgenproof: *)
Ltac TrivialExistsCMINORGEN :=
match goal with
| [ |- exists y, Some ?x = Some y /\ val_inject _ _ _ ] =>
exists x; split; [auto | try(econstructor; eauto)]
| [ |- exists y, _ /\ val_inject _ (Vint ?x) _ ] =>
exists (Vint x); split; [eauto with evalexpr | constructor]
| [ |- exists y, _ /\ val_inject _ (Vfloat ?x) _ ] =>
exists (Vfloat x); split; [eauto with evalexpr | constructor]
| [ |- exists y, _ /\ val_inject _ (Vlong ?x) _ ] =>
exists (Vlong x); split; [eauto with evalexpr | constructor]
| _ => idtac
end.

Lemma eval_binop_compat:
forall f op v1 tv1 v2 tv2 v m tm,
eval_binop op v1 v2 m = Some v ->
val_inject f v1 tv1 ->
val_inject f v2 tv2 ->
Mem.inject f m tm ->
exists tv,
eval_binop op tv1 tv2 tm = Some tv
/\ val_inject f v tv.