(** Conversions from ints to floats can be defined as bitwise manipulations over the in-memory representation.  This is what the PowerPC port does. The trick is that [from_words 0x4330_0000 x] is the float [2^52 + of_intu x]. *)
Definition ox4330_0000 := Int.repr 1127219200.        (**r [0x4330_0000] *)

Theorem of_intu_from_words:
forall x,
of_intu x = sub (from_words ox4330_0000 x) (from_words ox4330_0000 Int.zero).