Write an SRC assembly code to work both multiplication (*) and division (/). Ope

Question

Write an SRC assembly code to work both multiplication (*) and division (/). Operands are defined as constants, and the operator is defined as an ASCII character as follows:

Character ASCII

* 42

/ 47

op1 * op2 OR op1 / op2

Your program must read first operand, the operator, and then the second operand as above. Store the result in the memory location for result. When the operation is division (/), the result is the integer part of the division (e.g., 9/4 = 2). If the second operand in division is zero, store -1 in the result.

You may start with the following template.

;

; Multiplication and division (integer division) using addition and

; subtraction in SRC assembly language.

; If the second operand in division is zero, store -1 in the result.

;

.org 1000

ld r1, op1 ; r1 holds operand1

ld r2, op2 ; r2 holds operand2

ld r3, operator ; r3 holds the operator

lar r4, result ; r4 points to the location of result

lar r8, end

lar r10, multiplication

lar r12, division

addi r5,r3,-42 ; check for multiplication operation

brzr r10,r5 ; if yes, branch to multiplication

addi r5,r3,-47 ; check for division operation

brzr r12,r5 ; if yes, branch to division

br r8

multiplication:

lar r13, aa

lar r14, bb

lar r15, loop1

lar r16, store

la r20, 0 ; r20: number of negative values in op1 and op2

brpl r13,r1 ; check the sign of the first operand

neg r1,r1 ; if the sign is negative, make it to be positive

addi r20,r20,1 ;

aa: ; DEFINE YOUR CODE ; check the sign of the second operand

; DEFINE YOUR CODE ; if the sign is negative, make it to be positive

;

bb: addi r22,r2, 0 ;save the second operand as counter

la r6, 0

loop1: add ; DEFINE YOUR CODE

addi ; DEFINE YOUR CODE ; decrement the value of r22

; DEFINE YOUR CODE ; if r22

Explanation / Answer

Given positive integers a and b, output a/b and a%b. .data str1: .asciiz "Enter a: " str2: .asciiz "Enter b: " str3: .asciiz "a/b = " str4: .asciiz "a%b = " str5: .asciiz "a*b = " newline: .asciiz " " .text main: li $v0, 4 # system call code for print_string la $a0, str1 # address of str1 syscall # print str1 #get the first number from user, put it into $s0 li $v0, 5 # system call code for read_int syscall # read an integer into $v0 from console add $s0, $v0, $zero # copy $v0 into $s0 (a) #read print_string for str2 li $v0, 4 # system call code for print_string la $a0, str2 # address of str1 syscall # print str1 # get second number from user, put it into $t1 li $v0, 5 #load syscall for read_int syscall #make the syscall move $s1, $v0 #move the number read into $s1(b) #DO THE CALCULATIONS................................................ div $s0, $s1 #diving $s0 by $s1 mflo $t0 #storing value of lo(quotient) in #register $t0 mfhi $t1 #storing value of hi(remainder) in #register $t1 mult $s0, $s1 mflo $t2 li $v0,1 move $a0, $t2 syscall li $v0,4 la $a0, str5 syscall #read print_string for str3 li $v0, 4 # system call code for print_string la $a0, str3 # address of str1 syscall # print str1 #print a/b li $v0, 1 #load syscall print_int into $v0 move $a0, $t0 #move the number to print into $t2 syscall # read print string for str4 li $v0, 4 la $a0, str4 syscall # print remainder li $v0, 1 move $a0, $t1 syscall #end of program li $v0, 10 #system call code for exit syscall

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