Definition longuofsingle (x: aval) :=
match x with
| FS f =>
match Float32.to_longu f with
| Some i => L i
| None => if va_strict tt then Vbot else ntop
end
| _ => ntop1 x
end.

Lemma longuofsingle_sound:
forall v x w, vmatch v x -> Val.longuofsingle v = Some w -> vmatch w (longuofsingle x).