What does CISC stand for?
Answers:
CISC ( complex instruction set computer ) is a microprocessor instruction set architecture (ISA) in which each instruction can execute several low-level operations, such as a load from memory, an arithmetic operation, and a memory store, all in a single instruction. The term was retroactively coined in contrast to reduced instruction set computer (RISC).
Before the first RISC processors were designed, many computer architects tried to bridge the "semantic gap" - to design instruction sets to support high-level programming languages by providing "high-level" instructions such as procedure call and return, loop instructions such as "decrement and branch if non-zero" and complex addressing modes to allow data structure and array accesses to be combined into single instructions. The compact nature of such a CISC ISA results in smaller program sizes and fewer calls to main memory, which at the time (the 1960s) resulted in a tremendous savings on the cost of a computer.
The terms RISC and CISC have become less meaningful with the continued evolution of both CISC and RISC designs and implementations. The first highly pipelined "CISC" implementations, such as 486s from Intel, AMD, Cyrix, and IBM, certainly supported every instruction that their predecessors did, but achieved high efficiency only on a fairly simple x86 subset (resembling a RISC instruction set, but without the load-store limitations of RISC).
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It's "Complex Instruction-Set Computer". It's hard to explain, but it has to do with how the computers handles small tasks it's given. It can do multiple small things at the same time, making the computer run faster.
The simplest way to examine the advantages and disadvantages of RISC architecture is by contrasting it with it's predecessor: CISC (Complex Instruction Set Computers) architecture.
CISC stands for complex instruction set computer
some processors support single complex instructions which reduces the size of the code we write.
there are processors which support RISC
reduced instruction set computer
here processor supports only simple instructions forcing us to implement complex operations using simple commands...
making our programs longer
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