diff --git a/src/libcretonne/isa/encoding.rs b/src/libcretonne/isa/encoding.rs
new file mode 100644
index 0000000000..1b26e2bab9
--- /dev/null
+++ b/src/libcretonne/isa/encoding.rs
@@ -0,0 +1,33 @@
+//! The `Encoding` struct.
+
+/// Bits needed to encode an instruction as binary machine code.
+///
+/// The encoding consists of two parts, both specific to the target ISA: An encoding *recipe*, and
+/// encoding *bits*. The recipe determines the native instruction format and the mapping of
+/// operands to encoded bits. The encoding bits provide additional information to the recipe,
+/// typically parts of the opcode.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct Encoding {
+    recipe: u16,
+    bits: u16,
+}
+
+impl Encoding {
+    /// Create a new `Encoding` containing `(recipe, bits)`.
+    pub fn new(recipe: u16, bits: u16) -> Encoding {
+        Encoding {
+            recipe: recipe,
+            bits: bits,
+        }
+    }
+
+    /// Get the recipe number in this encoding.
+    pub fn recipe(self) -> usize {
+        self.recipe as usize
+    }
+
+    /// Get the recipe-specific encoding bits.
+    pub fn bits(self) -> u16 {
+        self.bits
+    }
+}
diff --git a/src/libcretonne/isa/mod.rs b/src/libcretonne/isa/mod.rs
index 74e1590fea..445893ee15 100644
--- a/src/libcretonne/isa/mod.rs
+++ b/src/libcretonne/isa/mod.rs
@@ -40,12 +40,14 @@
 //! The configured target ISA trait object is a `Box<TargetIsa>` which can be used for multiple
 //! concurrent function compilations.
 
-pub mod riscv;
-mod enc_tables;
-
+pub use isa::encoding::Encoding;
 use settings;
 use ir::{InstructionData, DataFlowGraph};
 
+pub mod riscv;
+mod encoding;
+mod enc_tables;
+
 /// Look for a supported ISA with the given `name`.
 /// Return a builder that can create a corresponding `TargetIsa`.
 pub fn lookup(name: &str) -> Option<Builder> {
@@ -100,35 +102,3 @@ pub trait TargetIsa {
     /// This is just used for printing and parsing encodings in the textual IL format.
     fn recipe_names(&self) -> &'static [&'static str];
 }
-
-/// Bits needed to encode an instruction as binary machine code.
-///
-/// The encoding consists of two parts, both specific to the target ISA: An encoding *recipe*, and
-/// encoding *bits*. The recipe determines the native instruction format and the mapping of
-/// operands to encoded bits. The encoding bits provide additional information to the recipe,
-/// typically parts of the opcode.
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-pub struct Encoding {
-    recipe: u16,
-    bits: u16,
-}
-
-impl Encoding {
-    /// Create a new `Encoding` containing `(recipe, bits)`.
-    pub fn new(recipe: u16, bits: u16) -> Encoding {
-        Encoding {
-            recipe: recipe,
-            bits: bits,
-        }
-    }
-
-    /// Get the recipe number in this encoding.
-    pub fn recipe(self) -> usize {
-        self.recipe as usize
-    }
-
-    /// Get the recipe-specific encoding bits.
-    pub fn bits(self) -> u16 {
-        self.bits
-    }
-}