Definition load_store_init_data1 (ge: Genv.t fundef type) (m: mem) (b: block) (p: Z) (d: init_data) : Prop :=
match d with
| Init_int8 n =>
Mem.load Mint8unsigned m b p = Some(Vint(Int.zero_ext 8 n))
| Init_int16 n =>
Mem.load Mint16unsigned m b p = Some(Vint(Int.zero_ext 16 n))
| Init_int32 n =>
Mem.load Mint32 m b p = Some(Vint n)
| Init_int64 n =>
Mem.load Mint64 m b p = Some(Vlong n)
| Init_float32 n =>
Mem.load Mfloat32 m b p = Some(Vsingle n)
| Init_float64 n =>
Mem.load Mfloat64 m b p = Some(Vfloat n)
| Init_addrof symb ofs =>
Mem.load Mptr m b p = Some
match Genv.find_symbol ge symb with
| Some b' => Vptr b' ofs
| None => Vint Int.zero
end
| Init_space n =>
forall z, 0 <= z < Z.max n 0 ->
Mem.load Mint8unsigned m b (p+z) = Some (Vint Int.zero)
end.
Definition initializer_aligned (z: Z) (d: init_data) : bool :=
match d with
| Init_int16 n => Zeq_bool (z mod 2) 0
| Init_int32 n => Zeq_bool (z mod 4) 0
| Init_int64 n => Zeq_bool (z mod 8) 0
| Init_float32 n =>  Zeq_bool (z mod 4) 0
| Init_float64 n =>  Zeq_bool (z mod 8) 0
| Init_addrof symb ofs =>  Zeq_bool (z mod (size_chunk Mptr)) 0
| _ => true
end.
Fixpoint initializers_aligned (z: Z) (dl: list init_data) : bool :=
match dl with
| nil => true
| d::dl' => andb (initializer_aligned z d) (initializers_aligned (z + init_data_size d) dl')
end.

Lemma read_as_zero_lem1:
forall m b z len,
(forall i, z <= i < z+len ->
load Mint8unsigned m b i = Some (Vint Int.zero)) ->
Genv.read_as_zero m b z len.