IT WORKS HELL YEAH.

common/src/instructions/args.rs

@@ -155,3 +155,54 @@ impl TryFrom<u32> for RTypeArgs {
         })
     }
 }
+
+#[macro_export]
+macro_rules! args {
+    // R-type arguments - allows omitting any field
+    (R $(, $field:ident: $value:expr)* $(,)?) => {{
+        let mut sr1: Option<Register> = None;
+        let mut sr2: Option<Register> = None;
+        let mut dr: Option<Register> = None;
+        let mut shamt: Option<u8> = None;
+
+        $(
+            args!(@assign_r_option sr1, sr2, dr, shamt, $field, $value);
+        )*
+
+        RTypeArgs::new(sr1, sr2, dr, shamt)
+    }};
+
+    // I-type arguments - requires immediate, allows omitting registers
+    (I, immediate: $immediate:expr $(, $field:ident: $value:expr)* $(,)?) => {{
+        let mut r1: Option<Register> = None;
+        let mut r2: Option<Register> = None;
+
+        $(
+            args!(@assign_i_option r1, r2, $field, $value);
+        )*
+
+        ITypeArgs::new($immediate, r1, r2)
+    }};
+
+    // Internal helpers (same as above for R-type)
+    (@assign_r_option $sr1:ident, $sr2:ident, $dr:ident, $shamt:ident, sr1, $value:expr) => {
+        $sr1 = Some($value);
+    };
+    (@assign_r_option $sr1:ident, $sr2:ident, $dr:ident, $shamt:ident, sr2, $value:expr) => {
+        $sr2 = Some($value);
+    };
+    (@assign_r_option $sr1:ident, $sr2:ident, $dr:ident, $shamt:ident, dr, $value:expr) => {
+        $dr = Some($value);
+    };
+    (@assign_r_option $sr1:ident, $sr2:ident, $dr:ident, $shamt:ident, shamt, $value:expr) => {
+        $shamt = Some($value);
+    };
+
+    // Internal helpers for I-type (without immediate handling)
+    (@assign_i_option $r1:ident, $r2:ident, r1, $value:expr) => {
+        $r1 = Some($value);
+    };
+    (@assign_i_option $r1:ident, $r2:ident, r2, $value:expr) => {
+        $r2 = Some($value);
+    };
+}