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Write a MIPSzy subroutine, power, that accepts 2 arguments x and y and computes x^y ....

Write a MIPSzy subroutine, power, that accepts 2 arguments x and y and computes x^y . You can assume that x and y are both larger than 0. The main program passes the two parameters and receives the return value through the program stack.

addi $t0, $zero, 5100

top:

lw $t1, 0($t0)

beq $t1, $zero, done

addi $sp, $sp, -4

sw $t1, 0($sp)

addi $t2, $zero,4

addi $sp, $sp, -4

sw $t2, 0($sp)

addi $sp, $sp, -4

jal power

lw $t3, 0($sp)

sw $t3, 0($t0)

addi $sp, $sp,12

addi $t0, $t0, 4

j top

power:

*** Put your subroutine

done:

(Memory configuration)

5100 1

5104 2

5108 3

5112 5

5116 2

5120 1

5124 0

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Answer #1

Please find the code below::

addi $t0, $zero, 5100
top:
lw $t1, 0($t0)
beq $t1, $zero, done
addi $sp, $sp, -4
sw $t1, 0($sp)
addi $t2, $zero,4
addi $sp, $sp, -4
sw $t2, 0($sp)
addi $sp, $sp, -4
jal power
lw $t3, 0($sp)
sw $t3, 0($t0)
addi $sp, $sp,12

li $v0,4
la $a0,prompt
syscall

li $v0,1
move $a0,$t3
syscall
j done
power:
li $t7,1 #store temp value
lw $s0,8($sp) #get value of x
lw $s1,4($sp) #get value of y
loop: #load until
mul $t7,$t7,$s0 #multiply by s0
sub $s1,$s1,1 #subract s1 by one
bgtz $s1,loop #loop if s1 greater than zero
sw $t7,0($sp) #save word to sp again
jr $ra #jump to register

done:

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