.data
newline: .ascii "\n"
Input_Message: .asciiz "\nPlease Enter a floating-point number: "
Second_Input_Message: .asciiz "\nPlease enter a second floating-point number: "
Answer: .asciiz "The sum of the two floating point values is: "
.text

main:

	li $v0, 4
	la $a0,Input_Message
	syscall  #syscall to print out the input message

	li $v0,6
	syscall #syscall to read a float input from the user
	mfc1 $t0,$f0 #moves the float value from coprocessor to register
	add $a1, $t0, $zero  #stores the float value into register $a1

	li $v0, 4
	la $a0,Second_Input_Message
	syscall #syscall to print out the second input message

	li $v0,6
	syscall # reads a float value from the user
	mfc1 $t1,$f0 #moves the float value from coprocessor to register
	add $a2, $t1, $zero #stores that value into $a2


	bgtz $a1,exponent #if $a1 is greater than zero, branch to exponent
	bgtz $a2,exponent #if $a2 is greater than zero, branch to exponent

exponent:

	move $s0,$a1 #loads $a1 into $s0

	sll $s5,$s0,1 #shifts $s0 to the left by 1 and store into register $s5

	srl $s5,$s5,24 #shift $s5 right by 24 and store into $s5

	move $s1,$a2 #moves the second exponent into register $s1

	sll $s6,$s1,1 #shifts $s1 left 1 and store into register $s6

	srl $s6,$s6,24 #shifts $s6 right 24 and store into same register


	srl $s3,$s0,31  #shift $s0 right 31 and store in $s3

	srl $s4,$s1,31 #shift value $s1 right 31 and store in $s4

	li $t9,1
	sll $t9,$t9,23 #shifts $t9 register left 23

	sll $s7,$s0,9  #shift $s0 left 9 and store value into $s7
	srl $s7,$s7,9  #shift $s7 right 9 and store into $s7
	or $s7,$s7,$t9


	sll $t8,$s1,9
	srl $t8,$t8,9
	or $t8,$t8,$t9

Matching_Exponents:   #loop which shifts the smaller exponent until it is the same as the larger exponent

	beq $s5,$s6, Calculations   #if the exponents are equal, branch to Calculations
	blt $s5,$s6, shift_value_right  #continue shifting until exponents are equal
	blt $s6,$s5, shift_secondvalue_right #continue shifting until exponents are equal
	j Matching_Exponents #loop until conditions are met to branch



	shift_value_right:   #shifts the value right by 1 and loops until the exponents of the two values match
	srl $s7,$s7,1
	addi $s5,$s5,1
	j Matching_Exponents

	shift_secondvalue_right: #shifts the value right by 1 and loops until the exponents of the two values match

	srl $t8,$t8,1
	addi $s6,$s6,1
	j Matching_Exponents

Calculations:
	beqz $s3,calc_one   #if significand = 0 then branch
	sub $s7,$0,$s7

calc_one:
	beqz $s4,calc_two  #if second significand = 0 branch
	sub $t8,$0,$t8

calc_two:
	add $t3,$s7,$t8
	li $s3,0
	bgez $t3, calc_three
	sub $t3,$0,$t3
	li $s3,1

calc_three:
	clz $t2,$t3 #stores the number of leading zeros into $t
	blt $t2,8,Branch
	bgt $t2,8,Branch_Two
	j Normalize #loop
Branch:
	srl $t3,$t3,1
	addi $s6,$s6,1
	j Normalize  #loop

Branch_Two:
	addi $t2,$t2,-8  #adds -8 to $t2
	sub $s6,$s6,$t2
	sllv $t3,$t3,$t2


Normalize:
	xor $t3,$t3,$t9


	sll $t4,$s3,31   #shift s3 left 31 and store in $t4
	sll $t5,$s6,23   #shift s6 left 23 and store in $t5
	add $t6,$t4,$t5  #add the value of $t5 and $t6 and store in $t6
	add $t6,$t6,$t3  #add $t3 and $t6 and store in $t6


	li $v0, 4   #Prints the prompt defined in the data section Answer:
	la $a0,Answer
	syscall

	li $v0,2
	mtc1 $t6,$f12 #moves the register value $t6 into coprocessor $f10
	syscall

exit: