What is the purpose of using different addressing modes in the instruction system?

The purpose of using different addressing modes in the instruction system is to "expand the addressing space and improve programming flexibility"; the addressing mode refers to the way to find the operand or operand address; different addressing modes are used in the instruction system The purpose of addressing mode is to find a balance between efficiency and convenience.

The purpose of using different addressing modes in the instruction system is to "expand the addressing space and improve programming flexibility."

Addressing mode refers to the way to find the operand or operand address.

The purpose of using different addressing modes in the instruction system is to find a balance between efficiency and convenience. Immediate data addressing and register addressing are the fastest in terms of efficiency, but the number of registers is small, and it is impossible to store all the operands in them for use. The use cases of immediate data are also very limited, so the data needs to be stored in memory. , and then use direct addressing, register indirect addressing, register relative addressing, base plus index addressing, relative base addressing and index addressing to move the data in the memory into the register.

Related introduction:

In memory, the ways to write or read operands or instruction words include address designation, associative storage and stack access. Almost all computers use address designation in memory. When the address specification method is used, the way in which the operand or instruction address is formed is called the addressing mode. Addressing modes are divided into two categories, namely instruction addressing mode and data addressing mode. The former is relatively simple and the latter is more complex. It is worth noting that in a traditionally designed computer, the addressing of instructions and data in memory alternate.

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