diff --git a/mie/include/mie/ir/op.h b/mie/include/mie/ir/op.h
index 783b3f3..9241679 100644
--- a/mie/include/mie/ir/op.h
+++ b/mie/include/mie/ir/op.h
@@ -72,4 +72,6 @@ MIE_API void mie_op_destroy(struct mie_op *op);
 MIE_API void mie_op_init(struct mie_op *op);
 MIE_API void mie_op_cleanup(struct mie_op *op);
 
+MIE_API const struct mie_type *mie_op_arg_get_type(const struct mie_op_arg *arg);
+
 #endif
diff --git a/mie/ir/op-arg.c b/mie/ir/op-arg.c
new file mode 100644
index 0000000..d67cd8d
--- /dev/null
+++ b/mie/ir/op-arg.c
@@ -0,0 +1,10 @@
+#include <mie/ir/op.h>
+
+const struct mie_type *mie_op_arg_get_type(const struct mie_op_arg *arg)
+{
+	if (arg->arg_flags & MIE_OP_F_ARG_RESOLVED) {
+		return arg->arg_value->reg_type;
+	}
+
+	return arg->arg_unresolved.reg_type;
+}