Introduction to Microprocessors CS 45 Session 2 Art of Assembly Language Programming 6 Modular Progr

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Introduction to Microprocessors(CS 45)Session
2Art of Assembly Language Programming
6Modular Programming
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AGENDA

• Bubble Sort
• Insertion Sort
• Modular Programming
• Procedures
• Macros
• Recursion example

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Modular Programming

• Monolithic programming consumes time and no
  reusability
• Given work can be divided into subtasks
• Each task can be carried out independently and in
  parallel
• Saves time and cost in the long run
• Amortizes the cost of developing products

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Modular Programming in 8086 - 1

• Can be done using 2 techniques
• Procedures
• Macros
• Procedures
• Use PROC and ENDP directives
• Only one copy of procedure in memory
• Use stack to save and retrieve return address

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Modular Programming in 8086 - 2

• Macros
• Use MACRO and ENDM directives
• Set of instructions replace the invocation
• So, multiple copies of macro in memory
• Sequential flow hence, no stack requirement
• Bit faster, but they take more memory space

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Recursion in ALP

• Lets take the example of factorial
• 1 if n 0
• Fact (n)
• n fact (n-1) otherwise

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Thank You
Q A