Discussion
Which one of the following is not a most common use of displacement addressing ?
Answer: D
The one that is not a common use of displacement addressing is Register-indirect addressing.
Displacement addressing computes the effective address as \(EA = A + (R)\): an address field plus the contents of a register. Stallings lists its three most common uses as relative addressing (R is the program counter), base-register addressing (R holds a base address) and indexing (A is a base, R holds an index).
Register-indirect addressing uses only the register's contents, \(EA = (R)\), with no displacement, so it is a separate mode, not an application of displacement addressing.
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