addressing modes in computer architecture ppt

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Chapter 11 Instruction Sets: Addressing Modes and Formats

PowerPC Addressing Modes • Load/store architecture —Indirect – Instruction includes 16 bit displacement to be added to base register (may be GP register) – Can replace base register content with new address —Indirect indexed – Instruction references base register and index register (both may be GP) – EA is sum of contents

PDF	CS305: Computer Architecture Five Common Addressing Modes Base lw $t1 4($s2) lw $t1 ($s2) #indirect addressing Computer Architecture 4 op rs rt Address Register Memory ±

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Addressing Modes

Register addressing mode ∗ Operands are located in registers ∗ It is the most efficient addressing mode Immediate addressing mode ∗ Operand is stored as part of the instruction This mode is used mostly for constants ∗ It imposes several restrictions ∗ Efficient as the data comes with the instructions Instructions are generally prefetched Both addre

What is the difference between EA & PC addressing mode?
EA= PC + Address field value PC= PC + Relative value. Base register addressing mode: Base register addressing mode is used to implement inter segment transfer of control.In this mode effective address is obtained by adding base register value to address field value. EA= Base register + Address field value. PC= Base register + Relative value.
What is a good addressing mode in assembly language?
The key to good assembly language programming is the proper use of memory addressing modes. The memory address of an operand consists of two components: Starting address of memory segment. Effective address or Offset: An offset is determined by adding any combination of three address elements: displacement, base and index.
What are PowerPC addressing modes?
PowerPC Addressing Modes • Load/store architecture —Indirect – Instruction includes 16 bit displacement to be added to base register (may be GP register) – Can replace base register content with new address —Indirect indexed – Instruction references base register and index register (both may be GP) – EA is sum of contents • Branch address
What are the different types of addressing modes?
William Stallings Computer Organization and Architecture 6thEdition Chapter 11 Instruction Sets: Addressing Modes and Formats Addressing Modes • Immediate • Direct • Indirect • Register • Register Indirect • Displacement (Indexed) • Stack Immediate Addressing • Operand is part of instruction • Operand = address field • e.g. ADD 5

Simple Addressing Modes

Memory Addressing Modes

• Direct addressing mode ∗ Offset is specified as part of the instruction Assembler replaces variable names by their offset values Useful to access only simple variables service.scs.carleton.ca

add AX,table1[SI]

SI needs to hold the element offset in bytes When we use the scale factor we avoid such byte counting service.scs.carleton.ca

Based-indexed addressing with no scale factor

Effective address is computed as base + index + signed displacement Useful in accessing two-dimensional arrays Displacement → points to the beginning of the array Base and index registers point to a row and an element within that row Useful in accessing arrays of records Displacement → represents the offset of a field in a record Base and index reg

Illustrative Examples

Insertion sort ∗ ins_sort.asm ∗ Sorts an integer array using insertion sort algorithm Inserts a new number into the sorted array in its right place Binary search service.scs.carleton.ca

∗ bin_srch.asm

∗ Uses binary search to locate a data item in a sorted array » Efficient search algorithm service.scs.carleton.ca

Example 2

Two-dimensional array Finds sum of a column Uses “based-indexed addressing with scale factor” to access elements of a column service.scs.carleton.ca

3 Examples of Addressing Modes in Computer Organization & Architecture

Addressing Modes in Computer Organization & Architecture

4 Examples of Addressing Modes in Computer Organization & Architecture

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