Reduced instruction set computer(RISC)
- Reduced Instruction Set Computer is what RISC stands for. The purpose of the Reduced Instruction Set Computer (RISC) architecture is to shorten computer execution times by streamlining the instruction set.
- A limited number of register-to-register actions are typically included in RISC instructions.
- As a result, information is kept in processor registers for calculations, and store instructions are used to move the results of those computations into memory.
- Every operation is carried out inside the CPU's registers. Because all RISC instructions employ basic register addressing, fewer addressing modes are needed.
- RISC is straightforward to decode and has a reasonably basic instruction format. This is where word boundaries can be used to align the instruction length. One instruction can be carried out by the RISC processors each clock cycle.
- Pipelining, which entails overlapping the fetch, decode, and execute steps of two or three instructions, is used to accomplish this.
- Compared to CISC, RISC requires comparatively more registers in the processing unit, which results in faster program execution.
Characteristics of RISC processor.
- It can execute a small number of commands.
- It has a limited number of addressing modes.
- It serves only to load and save instructions when memory access is needed.
- Every operation is carried out inside the CPU's registers.
- It has a fixed-length, readily interpretable instruction set.
- It is employed in the execution of single-cycle instructions.
- Instead of using microprogrammed control, it might be hardwired.