RISC : Reduced Instruction Set Computer. A RISC system has a reduced number of instructions (making it easier to implement efficient optimizing compilers) and more importantly it is load store architecture where pipelining can be implemented easily. e.g. IBM PowerPC, ARM, Intel i960
CISC : Complex Instruction Set Computer. A CISC system has complex instructions (making it easier for a human to directly program in assembly language) such as direct addition between data in two memory locations. e.g. Intel Pentium (x86), DEC MicroVAX, Motorola 680x0
RISC is faster than CISC
RISC
risc
risc
CISC
Pentium I processors are CISC.
CISC and RISC are the two categories that are used to classify CPU architecture. CISC is an acronym for complex instruction set computer.
The 8086/8088 is a CISC based architecture.
In CISC, the instruction set is very large that can be used for complex operations while in RISC the instruction set is reduced, and most of these instructions are very primitive. CISC computer's execution time is very high whereas RISC computer's execution time is very less. In, CISC code expansion is not a problem while in RISC code expansion may create a problem. In CISC, decoding of instructions is complex whereas, in RISC, the decoding of instructions is simple. CISC requires external memory for calculations, but RISC requires external memory for calculations. CISC has only a single register set while RISC has multiple register sets are present.
RISC stands for Reduced Instruction Set Computer. The design strategy of a RISC processor includes limiting the number of instructions. This does not mean that ALL RISC processors have less instructions than ALL CISC processors, but in general, they do.
8051 is a CISC but having less number of instruction as comared to ARM which is RISC.CISC
CISC: Complex Instruction Set ComputerRISC: Reduced Instruction Set Computer