From compcert Require Export Clightdefs.
Require Export VST.veric.base.
Require Export VST.veric.SeparationLogic.
Require Export VST.msl.Extensionality.
Require Export compcert.lib.Coqlib.
Require Export VST.msl.Coqlib2 VST.veric.coqlib4 VST.floyd.coqlib3.
Require Export VST.floyd.functional_base.
Hint Rewrite @sem_add_pi_ptr using (solve [auto with norm]) : norm.
Hint Rewrite sem_cast_i2i_correct_range using (solve [auto with norm]) : norm.
Hint Rewrite sem_cast_neutral_Vint : norm.
Definition isVint v := match v with Vint _ => True | _ => False end.
Hint Resolve is_int_I32_Vint : core.
Hint Rewrite sem_cast_neutral_int using
(auto;
match goal with H: is_int ?i ?s ?v |- isVint ?v => apply (is_int_is_Vint i s v H) end) : norm.
Hint Rewrite @eval_expr_Etempvar : eval.
Hint Resolve  @eval_expr_Etempvar' : core.
Hint Rewrite Int.add_zero  Int.add_zero_l Int.sub_zero_l : norm.
Hint Rewrite Ptrofs.add_zero  Ptrofs.add_zero_l Ptrofs.sub_zero_l : norm.
Hint Rewrite deref_noload_tarray : norm.
Hint Rewrite deref_noload_Tarray : norm.
Hint Rewrite flip_lifted_eq : norm.
Hint Resolve isptr_is_pointer_or_null : core.
Definition add_ptr_int  {cs: compspecs}  (ty: type) (v: val) (i: Z) : val :=
eval_binop Cop.Oadd (tptr ty) tint v (Vint (Int.repr i)).
Abort. (* broken in CompCert 2.7 *)
Definition Zcmp (op: comparison) : Z -> Z -> Prop :=
match op with
| Ceq => eq
| Cne => (fun i j => i<>j)
| Clt => Z.lt
| Cle => Z.le
| Cgt => Z.gt
| Cge => Z.ge
end.
Ltac intcompare H :=
(apply typed_false_cmp_repr in H || apply typed_true_cmp_repr in H);
[ simpl in H | auto; unfold repable_signed, Int.min_signed, Int.max_signed in *; omega .. ].
Hint Rewrite isptr_deref_noload using reflexivity : norm.
Definition headptr (v: val): Prop :=
exists b,  v = Vptr b Ptrofs.zero.

Lemma headptr_isptr: forall v,
headptr v -> isptr v.