for a description of how to solve this problem. *)
Definition samerep (ch1 ch2: memory_chunk) (v1 v2: val) :=
Memdata.size_chunk ch1 = Memdata.size_chunk ch2 /\
forall bl: list Memdata.memval,
Memdata.size_chunk ch1 = Z.of_nat (length bl) ->
(Memdata.decode_val ch1 bl = v1 <-> Memdata.decode_val ch2 bl = v2).

(* Specifications: *)
Lemma mapsto_single_int: forall sh v1 v2 p,
is_single v1 -> is_int I32 Unsigned v2 ->
samerep Mfloat32 Mint32 v1 v2 ->
mapsto sh (Tfloat F32 noattr) p v1 = mapsto sh (Tint I32 Unsigned noattr) p v2.
Lemma data_at_single_int: forall sh v1 v2 p1 p2,
is_single v1 -> is_int I32 Unsigned v2 ->
samerep Mfloat32 Mint32 v1 v2 ->
readable_share sh ->
p1 = p2 ->
data_at sh (Tfloat F32 noattr) v1 p1 = data_at sh (Tint I32 Unsigned noattr) v2 p2.
Lemma float32_to_bits_abs':
forall x,
Fappli_IEEE_bits.bits_of_b32 (Fappli_IEEE.Babs 24 128 (fun _ pl => (false,pl)) x) =
Z.land (Fappli_IEEE_bits.bits_of_b32 x) (2 ^ 31 - 1).
Lemma float32_to_bits_abs:
forall x, Float32.to_bits (Float32.abs x) = Int.and (Float32.to_bits x) (Int.repr (2 ^ 31 - 1)).
Lemma fabs_float32_lemma:
forall x: float32,
exists y: int,
samerep Mfloat32 Mint32 (Vsingle x) (Vint y) /\
samerep Mfloat32 Mint32 (Vsingle (Float32.abs x)) (Vint (Int.and y (Int.repr 2147483647))).