Institute of Electrical & Electronic Engineers
The last decade has witnessed the emergence of the Application-Specific Instruction-set Processor (ASIP) as a viable platform for embedded systems. Extensible ASIPs allow the user to augment a base processor with Instruction Set Extensions (ISEs) that execute on dedicated hardware Application-specific Functional Units (AFUs). Due to the limited number of read and write ports in the register file of the base processor, the size and complexity of AFUs are generally limited. Recent papers have focused on overcoming these constraints by serializing access to the register file. Exhaustive ISE enumeration methods are not scalable and generally fail for larger applications and register files with a large number of read and write ports.