add catapult 3-clone

Author: calad0i

hls4ml/templates/catapult/nnet_utils/nnet_stream.h

@@ -41,6 +41,26 @@ void clone_stream(ac_channel<data_T> &data, ac_channel<res_T> &res1, ac_channel<
     }
 }
 
+template <class data_T, class res_T, int N>
+void clone_stream(ac_channel<data_T> &data, ac_channel<res_T> &res1, ac_channel<res_T> &res2, ac_channel<res_T> &res3) {
+#ifndef __SYNTHESIS__
+    while (data.available(1))
+#endif
+    {
+        data_T in_data = data.read();
+        res_T out_data;
+
+    ClonePack:
+        for (int j = 0; j < data_T::size; j++) {
+            out_data[j] = in_data[j];
+        }
+
+        res1.write(out_data);
+        res2.write(out_data);
+        res3.write(out_data);
+    }
+}
+
 template <class data_T, class res_T, int N> void repack_stream(ac_channel<data_T> &data, ac_channel<res_T> &res) {
     if (data_T::size == res_T::size) {
         for (int i = 0; i < N / data_T::size; i++) {