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Part B - Implement the Queue in LC-3 Now implement a similar circular queue in LC-3 assembly. Data structure in memory Use the following layout (similar style to the stack code from class): Q_BASE .FILL X4100; base address of queue array ; capacity (in elements) Q_CAPACITY.BLKW #1 Q_HEAD .BLKW #1 QTAIL .BLKW #1 Q_SIZE .BLKW #1 ; index of front element (0..capacity-1) ; index one past last element (0..capacity-1) ; current number of elements (0..capacity) We will use this calling convention: ENQUEUE Input: RO = value to enqueue Output: R5 = 1 if success R5 = 0 if failure (queue full; queue unchanged) DEQUEUE Input: none Output: If queue not empty: RO dequeued value R5 = 1 (success) If queue empty: R5 = 0 (failure; queue unchanged; RO don't care) B1. Subroutine Queuelnit Write an LC-3 subroutine Queuelnit with this behavior: Input: RO capacity (number of elements, e.g., 5) Effects: Stores capacity into Q CAPACITY Sets Q HEAD = 0 Sets Q TAIL = 0 Sets Q SIZE = 0 RO should be restored to…
A2. Trace the queue operations Draft the Queue by hand. Assume we start with an empty queue. head = 0, tail = 0, size = 0 data = [?, ?, ?, ?, ?] (contents unknown at first) Trace the following sequence step by step: enqueue(10) enqueue(20) enqueue(30) dequeue() enqueue(40)
Part C - Manual LC-3 Trace (Registers + Memory) In this part, you will simulate your LC-3 queue by hand. Assume the following initial conditions in memory: Q_BASE = x4100 (Q_BASE..Q_BASE+4) are initially unknown (don't care) Q CAPACITY = 5 Q_HEAD = 0 QTAIL = 0 Q_SIZE = 0 And assume your main program executes this sequence of calls: RO <- #5 JSR QueueInit RO <- #7 JSR ENQUEUE RO <- #3 JSR ENQUEUE RO <- #9 JSR ENQUEUE JSR DEQUEUE RO <- #5 JSR ENQUEUE JSR DEQUEUE JSR DEQUEUE JSR DEQUEUE ; one extra dequeue

Chapter 17 Solutions

Instructor Solutions Manual For Introduction To Java Programming And Data Structures, Comprehensive Version, 11th Edition

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