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+

/// Trait to interact with immediate operands.
+pub(crate) trait Imm {
+    /// Get immediate operand as slice of bytes.
+    fn bytes(&self) -> &[u8];
+}
+
+macro_rules! impl_imm {
+    ($name:ident, $size:expr, from: $( $from:ty ),* $(,)?) => {
+        /// Immediate operand.
+        pub struct $name([u8; $size]);
+
+        impl Imm for $name {
+            /// Get immediate operand as slice of bytes.
+            fn bytes(&self) -> &[u8] {
+                &self.0
+            }
+        }
+
+        $(
+        impl From<$from> for $name {
+            fn from(imm: $from) -> Self {
+                let mut buf = [0u8; $size];
+                let imm = imm.to_ne_bytes();
+                buf[0..imm.len()].copy_from_slice(&imm);
+                $name(buf)
+            }
+        }
+        )*
+    }
+}
+
+impl_imm!(Imm8, 1, from: u8, i8);
+impl_imm!(Imm16, 2, from: u16, i16, u8, i8);
+impl_imm!(Imm32, 4, from: u32, i32, u16, i16, u8, i8);
+impl_imm!(Imm64, 8, from: u64, i64, u32, i32, u16, i16, u8, i8);
+

+