Hint Resolve make_cast_int_correct make_longofint_correct: cshm.
Ltac InvEval :=
match goal with
| [ H: None = Some _ |- _ ] => discriminate
| [ H: Some _ = Some _ |- _ ] => inv H; InvEval
| [ H: match ?x with Some _ => _ | None => _ end = Some _ |- _ ] => destruct x eqn:?; InvEval
| [ H: match ?x with true => _ | false => _ end = Some _ |- _ ] => destruct x eqn:?; InvEval
| _ => idtac
end.

Lemma make_neg_correct:
forall a tya c va v e le m,
sem_neg va tya = Some v ->
make_neg a tya = OK c ->
eval_expr ge e le m a va ->
eval_expr ge e le m c v.