What are the advantages and disadvantages of relative addressing?

Advantages:

(i) Since all the address information need not be include in the instructions, instruction length is reduced.

(ii) By changing the contents of R, the process can change the absolute addresses referred to buy a block of instructions B. This address modification permits the processor to move the entire block B from one region of the main memory to another without invalidating the address in B.

R can be used for storing indexes to facilitate the processing of indexed data. In this rile, R is called “indexed register”. The indexed items X (0).

Disadvantages:

(i)  The extra logic circuits needed to computer addresses.

(ii)  Processing time needed to computer addresses.