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CONTROL FLOW INSTRUCTIONS AND PROGRAM STRUCTURES

CONTROL FLOW INSTRUCTIONS AND PROGRAM STRUCTURES. Topic of lecture. 1. Flag-Control Instructions 2. Compare Instructions 3. Control Flow and Jump Instructions 4. Subroutines and Subroutine-Handling Instructions 5. The Loop and the Loop-Handling Instructions. Flag-Control Instructions.

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CONTROL FLOW INSTRUCTIONS AND PROGRAM STRUCTURES

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  1. CONTROLFLOW INSTRUCTIONS ANDPROGRAM STRUCTURES

  2. Topic of lecture 1. Flag-Control Instructions 2. Compare Instructions 3. Control Flow and Jump Instructions 4. Subroutines and Subroutine-Handling Instructions 5. The Loop and the Loop-Handling Instructions

  3. Flag-Control Instructions • The flag-control instructions, when executed, directly affect the state of the flags. These instructions include: • LAHF (Load AH from flags) • SAHF (Store AH into flags)

  4. Compare Instruction

  5. Control Flow and Jump Instructions • Unconditional jump instruction. • Conditional jump instruction. • Branching structure – IF-THEN. • Loop program structure – REPEAT-UNTIL and WHILE-DO. • Applications using the loop and branch software structures.

  6. Unconditional jump

  7. Conditional jump

  8. Unconditional jump instruction

  9. Conditional jump instruction

  10. Subroutines and Subroutine-Handling Instructions • A subroutine is a special program that can be called for execution from any point in a program. • A subroutine is also known as a procedure. • A return instruction must be included at the end of the subroutine to initiate the return sequence to the main program environment. • CALL and RET instructions • PUSH and POP instructions

  11. Subroutines and Subroutine-Handling Instructions

  12. The Loop and the Loop-HandlingInstructions

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