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+Require Import AST.
+Require Import Values.
+Require Import Integers.
+Require Import Coq.ZArith.BinIntDef.
+Require Import BinNums.
+
+Local Open Scope Z_scope.
+
+Definition zscale_of_chunk (chunk: memory_chunk) : Z :=
+ match chunk with
+ | Mint8signed => 0
+ | Mint8unsigned => 0
+ | Mint16signed => 1
+ | Mint16unsigned => 1
+ | Mint32 => 2
+ | Mint64 => 3
+ | Mfloat32 => 2
+ | Mfloat64 => 3
+ | Many32 => 2
+ | Many64 => 3
+ end.
+Definition scale_of_chunk chunk := Vint (Int.repr (zscale_of_chunk chunk)).