(a) How is a DSP processor's instruction set typically different from that of a general-purpose computer, in spite of the fact that both have caches? (b) What is the main difference between a computer and a mobile phone with regard to virtual memory? (c) What are the relative advantages of having a swap partition versus a swap file, and vice versa? (d) What is regularisation of an instruction pipeline? Does a programmer have to insert the NOP statements to regularise a pipeline?