LC-3 Data Structures. Textbook chapter 10

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1 LC-3 Data Structures Textbook chapter 10

2 LC-3 data structures Abstract data structures are Defined by the rules for inserting and extracting data In this section, we will talk about The array The stack Arithmetic using a stack CMPE12 Summer

3 The array data structure Array: A list of values arranged sequentially in memory and grouped under a single name In C, the expression a[4] refers to the 5th element of the array a Most assembly languages have only basic concept of arrays (.blkw in LC-3) E.g., a list of integers starting at 5 number[0] = 5; number[1] = 6; number[2] = 7; number[3] = 8; CMPE12 Summer

4 Properties of arrays Each element is the same size (i.e. same type) Elements are stored contiguously First element is located at the lowest memory address In assembly language we must Allocate correct amount of space for an array Map array addresses to memory addresses E.g., myarray.blkw 5 CMPE12 Summer

5 What is a pointer? A pointer is an address of a variable in memory It s just an address Lets the programmer use indirect addressing Indirectly address variables Base of an array is the pointer to the first element Wait, what? myarray.blkw 5 What happens when LEA R2, myarray? CMPE12 Summer

6 Array example myarray.blkw 5 LEA R2, myarray LDR R0, R2, #0 STR R0, R2, #2 CMPE12 Summer

7 Multi-dimensional arrays? How do you represent a checkerboard? The problem: memory is linear One-dimensional CMPE12 Summer

8 Multi-dimensional arrays Consider two rows Array elements are sublabeled with their row and column A: 2 rows (numbered 0 and 1) A: 4 columns (numbered 0 to 3) In array A: A02 is the 0 th row and 2 nd column How do you map this onto a linear structure? A A00 A01 A02 A03 1 A10 A11 A12 A13 CMPE12 Summer

9 Array memory mappings Row major Read down the row first Column major Read down the column first CMPE12 Summer

10 Array representation: Row major A x3100 x3101 x x3103 x3104 x x3106 x3107 CMPE12 Summer

11 Array representation: Column major A x3100 x3101 x x3103 x3104 x x3106 x3107 CMPE12 Summer

12 FIFO (Standard queue) FIFO is first in, first out Standard queue (waiting in line) FRONT SHOES CMPE12 Summer

13 LIFO (Standard stack) LIFO is last in, first out Sometimes called FILO, first in, last out Standard stack TOP CMPE12 Summer

14 Example: LIFO and FIFO (LIFO) Stack: (FIFO) Queue: A, B, C C, B, A D, E, F D, E, F C F B E A D CMPE12 Summer

15 The stack data structure Stack structure is LIFO (last in, first out) Basic pieces of stack Stack itself Top of stack Two basic stack operations Push: Put data on top of stack Pop: Remove top element from stack CMPE12 Summer

16 Stack overflow and underflow Trying to pop from empty stack Underflow Trying to push onto full stack Overflow CMPE12 Summer

17 Stack overflow R1 R0 TOP.. push R0 push R1.. CMPE12 Summer

18 Stack underflow.. pop R0 pop R1. TOP. CMPE12 Summer

19 A coin holder as a stack CMPE12 Summer

20 A hardware stack Implemented in hardware (i.e., with registers) Previous data entries move up to accommodate each new data entry Note that the Top Of Stack is always in the same place CMPE12 Summer

21 Stacks in hardware and software Implemented in hardware with registers Previous data entries move up to accommodate each new data entry Implemented in software with code, in memory Stack pointer points to the top (empty) element Stack grows from high (0xffff) to low (0x0000) memory CMPE12 Summer

22 Stack in LC-3 In LC-3 The stack pointer moves as new data is entered R6 acts as the stack pointer (the TOS register) CMPE12 Summer

23 PUSH in LC-3 Write data to top empty location of stack Top of stack is pointed to by stack pointer (SP) Decrement stack pointer (stack is moving down in memory) E.g., Assume data to push is in R0 PUSH STR R0, R6, #0 ADD R6, R6, #-1 [R0] R6 CMPE12 Summer

24 POP in LC-3 Increment stack pointer (stack is moving down in memory) Now points to full location Read data from top of stack E.g., Assume data to pop goes into R0 POP ADD R6, R6, #1 LDR R0, R6, #0 R6 CMPE12 Summer

25 Checking for overflow and underflow Before pushing, we have to test for overflow Before popping, we have to test for underflow In both cases, use R5 to report success or failure Flow chart is similar for push and overflow POP CMPE12 Summer

26 When is the stack empty or full? If SP always points to next empty element (next available location to push) Stack overflow when SP = Stack underflow when SP = x3ffa x3ffb x3ffc x3ffd x3ffe x3fff x4000 MAX BASE CMPE12 Summer

27 Stack protocol on LC-3: An example Conventions PUSH pushes R0, returns success in R5 POP pops into R0, returns success in R5 Stack pointer is R6 and points to the top empty element All other used registers need to be calleesaved PUSH and POP should not overwrite any other registers The stack goes from x3fff to x3ffb CMPE12 Summer

28 Stack protocol in LC-3: POP POP ST R2, Save2 ; save, needed by POP ST R1, Save1 ; save, needed by POP LD R1, nbase ; nbase contains -x3fff ADD R1, R1, #-1 ; R1 now has -x4000 ADD R2, R6, R1 ; compare SP to BASE BRz fail_exit ; branch if stack is empty ADD R6, R6, #1 ; adjust stack pointer LDR R0, R6, #0 ; the actual pop BRnzp success_exit CMPE12 Summer

29 Stack protocol in LC-3: PUSH PUSH ST R2, Save2 ; needed by PUSH ST R1, Save1 ; needed by PUSH LD R1, nmax ; nmax has -x3ffb ADD R2, R6, R1 ; compare SP to x3ffb BRz fail_exit ; branch is stack is full STR R0, R6, #0 ; the actual push ADD R6, R6, #-1 ; adjust stack pointer CMPE12 Summer

30 Stack protocol in LC-3: Return values success_exit LD R1, Save1 ; restore registers LD R2, Save2 AND R5, R5, #0 ; R5 <-- success RET fail_exit LD R1, Save1 ; restore registers LD R2, Save2 AND R5, R5, #0 ADD R5, R5, #1 ; R5 <-- fail RET nbase.fill xc001 ; nbase has -x3fff nmax.fill xc005 ; nmax has x3ffb Save1.FILL x0000 Save2.FILL x0000 CMPE12 Summer

31 Stack as an alternative to registers Three-address vs zero-address The LC-3 explicitly specifies the location of each operand: it is a three-address machine e.g. ADD R0, R1, R2 Some machines use a stack data structure for all temporary data storage: these are zeroaddress machines The instruction ADD would simply pop the top two values from the stack, add them, and push the result back on the stack Some calculators use a stack to do arithmetic, most general purpose microprocessors use a register bank CMPE12 Summer

32 Recommended exercises Read and implement the examples in textbook sections 10.3, 10.4, and 10.5 Ex 10.3, 10.4, 10.5 ok but tedious Ex 10.6 (and 10.7), 10.8, 10.9 CMPE12 Summer

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