5.2 Instruction Set Architecture (P2)

Question 1

What is an addressing mode (and what are 3 examples)

Answer 1

Question 2

What is a memory address

Answer 2

Question 3

What is an n-address function (and how are the addresses typically distribuited between input and output)

Answer 3

Question 4

Solve this problem using an immediate addressing mode

Answer 4

specified 1 as data in operand

Question 5

Solve this problem using a direct addressing mode

Answer 5

t is in address 1. 1 is the operand

Question 6

Solve this problem manually (no variable operands)

Dereferencing src

Answer 6

Question 7

Solve this problem using an indirect addressing mode

Dereferencing src

Answer 7

[r1] specifies that it is the address of the address, so would then use GPR

Question 8

What is a static immediate and a static address (what do they refer to)

Answer 8

Also note the encoding pressure: instruction size must be > all operand bytes

Question 9

Given the challenge of instruction pressure what are the following adressing strategies:
- Explicit
- Implicit
- Overloaded
- Derived
- Distributed

Answer 9

xi is the operand (address)

Question 10

Solve this problem manually (no variable operands)

Answer 10

Question 11

Solve this problem using an indexed addressing mode

Answer 11

Question 12

Solve this problem manually (no variable operands)

Answer 12

Question 13

Solve this problem using an auto-indexed addressing mode

Answer 13

Note how it updates the base address

Question 14

Solve this problem manually (no variable operands)

Note the need of a scaling factor (more than 1 byte)

Answer 14

Question 15

Solve this problem using a scaled-indexed addressing mode

Answer 15