The auto decrement mode is very similar to the register indirect mode. The only exception is that the register is decremented before (or after) we use its value to access memory. When the address that is stored in the register is defining a data table in memory, it is crucial to decrement the register after accessing the table every time. It can be obtained using the decrement instruction.
In this article, we will take a look at the Auto Decrement Addressing Mode according to the GATE Syllabus for CSE (Computer Science Engineering). Read ahead to learn more.
Auto Decrement Addressing Mode
The auto decrement addressing mode is just the opposite of the auto increment mode. In the case of auto decrement mode, the content present in the register is initially decremented, and then the content that is decremented in the register is used in the form of an effective address.
It is presented symbolically as follows:
-(R)
The auto decrement mode helps us in implementing the structure of the stack.
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