Section CONSTRUCTORS.
Variable ge: genv.
Variable fn: function.
(** Decomposition of integer literals *)
Inductive wf_decomposition: list (Z * Z) -> Prop :=
| wf_decomp_nil:
wf_decomposition nil
| wf_decomp_cons: forall m n p l,
n = Zzero_ext 16 m -> 0 <= p -> wf_decomposition l ->
wf_decomposition ((n, p) :: l).
Fixpoint recompose_int (accu: Z) (l: list (Z * Z)) : Z :=
match l with
| nil => accu
| (n, p) :: l => recompose_int (Zinsert accu n p 16) l
end.

Lemma Zinsert_eqmod:
forall n x1 x2 y p l, 0 <= p -> 0 <= l ->
eqmod (two_power_nat n) x1 x2 ->
eqmod (two_power_nat n) (Zinsert x1 y p l) (Zinsert x2 y p l).