Question

Write four MIPS–Assembly programs to implement the following mathematical ex-

pressions (use the “loop approach”)

2 2 2 2 (d) 4D: Ï Ï Ï Ï [2° +2° +2° +2°) d=1 c=1 b=1 a=1 Place the result, of each mathematical expression, in the console of MARS.

Answer 1

Here is complete MIPS-Assembly program that calculates given expression:

.text
.globl main

main:
li $t3,1 # d = 1
li $s0,0 # sum
loop1:
beq $t3,3,exit1
li $t2,1 # c = 1
loop2:
beq $t2,3,exit2
li $t1,1 # b = 1
loop3:
li $t0,1 # a = 1
beq $t1,3,exit3
loop4:
# Compute the values
beq $t0,3,exit4
mul $t4,$t0,2
mul $t5,$t1,2
mul $t6,$t2,2
mul $t7,$t3,2
add $s0,$s0,$t4
add $s0,$s0,$t5
add $s0,$s0,$t6
add $s0,$s0,$t7
addi $t0,$t0,1
j loop4
exit4:
addi $t1,$t1,1
j loop3
exit3:
addi $t2,$t2,1
j loop2
exit2:
addi $t3,$t3,1
j loop1
exit1:
# Prints the value on the MARS console
move $a0,$s0
li $v0,1
syscall
# exit
li $v0,10
syscall

Screenshot of the code:

. text .globl main main: li $t3,1 # d = 1 li $80,0 # sum loopl: beq $t3, 3, exiti li $t2,1 = c = 1 loop2: beq $t2,3, exit2 li $t1,1 # b = 1 loop3: li $t0, 1 # a = 1 beq $t1, 3, exit3 loop4: # Compute the values beq $t0, 3, exit4 mul $t4, $t0,2 mul $t5, $t1,2 mul $t6, $t2,2 mul $t7, $t3,2 add $50, $50, $t4 add $50, $ 50, $t5 add $50, $50, $t6 add $50, $50, $t7 addi $t1,$t0,1 j loop4 exit4: addi $t1,$t1,1 j loop3

exit 3: addi $t2, $t2,1 j loop2 exit2: addi $t3, $t3,1 j loop1 exiti: # Prints the value on the MARS console move $al, $50 li $v0,1 syscall # exit li $v0, 10 syscall

Here is output (printed on the console):

192

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