1. Department of Computer Science and Information Technologies, Faculty of Computer Science, CITIC-Research Center of Information and Communication Technologies, Universidade da Coruña, A Coruña, A Coruña, Spain
2. Computer Architecture Group, Faculty of Computer Science, Universidade da Coruña, A Coruña, Spain
3. Department of Computer Science and Information Technologies, Faculty of Communication Science, CITIC-Research Center of Information and Communication Technologies, Universidade da Coruña, A Coruña, Spain