Which processor requires more number of registers?

To answer your question, the number of registers a processor requires depends on its architecture, not necessarily the processor itself. For example, RISC (Reduced Instruction Set Computer) processors typically require more registers than CISC (Complex Instruction Set Computer) processors. This is because RISC processors use a load/store architecture where computations can only be done on data in the registers, not in memory directly. Therefore, they need more registers to hold data temporarily. On the other hand, CISC processors can perform operations directly on memory, so they don't need as many registers.