Definition memory_block (sh: share) (n: Z) (v: val) : mpred :=
match v with
| Vptr b ofs => (!!(Ptrofs.unsigned ofs + n < Ptrofs.modulus)) && memory_block' sh (nat_of_Z n) b (Ptrofs.unsigned ofs)
| _ => FF
end.

Lemma VALspec_range_exp_address_mapsto_eq:
forall ch sh l,
(align_chunk ch | snd l) ->
VALspec_range (size_chunk ch) sh l = EX v: val, address_mapsto ch v sh l.