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Question :
Difference between RISC and CISC
Category Hardware and Software Design Interview Questions
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Added on 10/13/2010
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RISC-Means Reduced Instruction Set Computer.a Risc
system has reduced number of instructions and more
importantly it is load store architecture were
pipelining can be implemented easily.Eg.ATMEL AVR

CISC-Means Complex instruction set architecure.A CISC
system has complex instructions such as direct
addition between data in two memory locations.Eg.8085

Submitted by H.Ranga samy (rangasamy_h@yahoo.com)
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Features of RISC:
Uniform instruction format, using a single word with the opcode in the same bit positions in every instruction, demanding less decoding;
Identical general purpose registers, allowing any register to be used in any context, simplifying compiler design (although normally there are separate floating point registers);
Simple addressing modes. Complex addressing performed via sequences of arithmetic and/or load-store operations;
Few data types in hardware, some CISCs have byte string instructions, or support complex numbers; this is so far unlikely to be found on a RISC.

Features of CISC:
* complex instruction.
* more addressing mode.
* Highly pipelined.
vice-versa of RISC.
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Posted by: sandeep

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RISC CISC
Used by Apple Used by Intel and AMD processors
Requires less registers therefore it is easier to design Slower than RISC chips when performing instructions
Faster that CISC More expensive to make compared to RISC
Reduced Instruction Set Computer Complex Instruction Set Architecture
Pipelining can be implemented easily Pipelining implementation is not easy
Direct addition is not possible Direct addition between data in two memory locations. Ex.8085
Fewer, simpler and faster instructions Large amount of different and complex instructions
RISC architecture is not widely used Atleast 75% of the processor use CISC architecture
RISC chips require fewer transistors and cheaper to produce. Finally, it's easier to write powerful optimized compilers. In common CISC chips are relatively slow (compared to RISC chips) per instruction, but use little (less than RISC) instructions.
RISC puts a greater burden on the software. Software developers need to write more lines for the same tasks. In CISC, software developers no need to write more lines for the same tasks
Mainly used for real time applications Mainly used in normal PC?s, Workstations and servers
Large number of registers, most of which can be used as general purpose registers CISC processors cannot have a large number of registers.
RISC processor has a number of hardwired instructions. CISC processor executes microcode instructions.

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Posted by: Gopi Krishnan. D

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RISC-Means Reduced Instruction Set Computer.a Risc
system has reduced number of instructions and more
importantly it is load store architecture were
pipelining can be implemented easily.Eg.ATMEL AVR

CISC-Means Complex instruction set architecure.A CISC
system has complex instructions such as direct
addition between data in two memory locations.Eg.8085

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Posted by: NAV

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risc-
risc is reduced instruction set computer .risc is cheaper than cisc because cisc consist of complex instructions,cisc stands for complex instruction set computer.risc reduces the instructions in the computer so coputer takes the speed as fast than cisc,cisc consist instruction more than risc.risc is efficient than cisc.risc& cisk are applicable for all microprocessors
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Posted by: nana banagar

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in risc limietd instuction in it. and in cisc many instruction perform by one.
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Posted by: sandeep18391

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