Question

Write a MIPS assembly language program to read an arbitrary number of integer pairs from a file. Each pair will then be multiplied together with the results being accumulated (added together) forming a sum-of-products operation.

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Answer 1

Using a text editor create the following program file and experiment with the different features of the MIPS simulator. All MIPS assembly language source code files must be saved as text only. the algorithm used here sums the integers in reverse order.

Program Name: Sum of Integers

Programmer:    YOUR NAME

Date last modified:

# Functional Description:

# A program to find the Sum of the Integers from 1 to N, where N is a value

# input from the keyboard.

# Pseudocode description of algorithm:

# main:    cout << “Please input a value for N”

#        cin >> v0

#        If ( v0 <= 0 ) stop

#        t0 = 0;

#        While (v0 > 0 ) do

#            {

#            t0 = t0 + v0;   

#            v0 = v0 - 1;

#            }

#        cout << t0;

#        go to main

# Cross References:

# v0: N,   

# t0: Sum

        .data

prompt:    .asciiz “\n Please Input a value for N= ”

result: .asciiz “ The sum of the integers from 1 to N is ”

bye:        .asciiz    “\n **** Adios Amigo - Have a good day ****”

        .globl    main

        .text

main:   

        li    $v0, 4 # system call code for Print String

        la    $a0, prompt # load address of prompt into $a0

        syscall # print the prompt message

li    $v0, 5 # system call code for Read Integer

        syscall # reads the value of N into $v0

blez    $v0, end # branch to end if $v0 < = 0

        li    $t0, 0 # clear register $t0 to zero

loop:       

        add     $t0, $t0, $v0 # sum of integers in register $t0

        addi    $v0, $v0, -1 # summing integers in reverse order

        bnez    $v0, loop # branch to loop if $v0 is != zero       

        li    $v0, 4 # system call code for Print String

        la    $a0, result # load address of message into $a0

        syscall # print the string

li    $v0, 1 # system call code for Print Integer

move    $a0, $t0 # move value to be printed to $a0

        syscall # print sum of integers

        b     main # branch to main

end: li    $v0, 4 # system call code for Print String

la    $a0, bye # load address of msg. into $a0

        syscall # print the string

        li    $v0, 10        # terminate program run and

        syscall            # return control to system