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CISC versus RISC

CISC: Complex Instruction Set RISC: RISC： Reduced Instruction Set Computer
analogy C language with many library functions C without library functions
Design ideas A single instruction performs a complex basic function. A command to complete a basic “action”; Multiple instructions combine to perform a complex basic function.
CISCIdeas: in addition to provide integer addition, subtraction and multiplication instructions in addition, also provide matrix addition instructions, matrix subtraction instructions, matrix multiplication instructions RISCProvide only integer addition, subtraction and multiplication instructions
On behalf of The x86 architecture is mainly used for notebook and desktop computers ARM architecture, mainly used in mobile phones, tablets, etc
Instruction and circuit An instruction can be done by a special circuit One instruction per circuit, the circuit design is relatively simple, lower power consumption
implementation Some complex instructions with pure hardware implementation is very difficult to use the “stored program” design idea, by a more general circuit with storage components to complete an instruction “Parallel”, “pipeline”

Divide the above into smaller pieces, as shown in the table below

Take a chestnut

For example, if you forget the previous schematic of how a computer works, you can click on the link below to see it again:Blog.csdn.net/weixin_4552… Among them, the multiplication instruction can access, which must be CISC