Addressing Modes

Introduction

Addressing modes determine how the memory address of an operand is calculated.

Immediate Addressing: The operand is specified directly in the instruction.
Register Addressing: The operand is stored in a register.
Direct Addressing: The memory address of the operand is specified directly in the instruction.
Indirect Addressing: The memory address of the operand is stored in a register or memory location.
Indexed Addressing: The memory address of the operand is calculated by adding an index value to a base address.
Base-Indexed Addressing: The memory address of the operand is calculated by adding a base address and an index value.
Relative Addressing: The memory address of the operand is calculated relative to the current instruction pointer.

Immediate Addressing:
- Advantage: Fast and efficient.
- Disadvantage: Limited to small values.
Register Addressing:
- Advantage: Fast and efficient.
- Disadvantage: Limited number of registers.
Direct Addressing:
- Advantage: Simple and straightforward.
- Disadvantage: Limited flexibility.
Indirect Addressing:
- Advantage: Flexible and powerful.
- Disadvantage: Can be slower due to additional memory access.

Flexibility: Addressing modes provide flexibility in programming and data access.
Efficiency: Choosing the right addressing mode can improve program efficiency.
Code Generation: Understanding addressing modes is crucial for code generation and optimization.