(** Conversions between floats and unsigned ints can be defined
  in terms of conversions between floats and signed ints.
  (Most processors provide only the latter, forcing the compiler
  to emulate the former.)   *)

Definition ox8000_0000 := Int.repr Int.half_modulus.

Theorem of_intu_of_int_1: forall x, Int.ltu x ox8000_0000 = true -> of_intu x = of_int x.