#/* Author    : Rick van der Zwet
# * S-number  : 0433373
# * Version   : $Id: myprog.s 237 2007-09-19 13:19:08Z rick $
# * Copyright : FreeBSD Licence 
# */
# space declaration to be used for the printf statement
 .data
	.align 4
space:  .asciiz	 "  "
 	.align 4
# array A reservation 80/4 means a 20 in size
A:	.space	80
        .align i
# array B, same size as array A
B:	.space	80
        .align 4
# declaration of integer C
C:	.word C
	.align 4
# declaration of integer i
i:	.word i
	.text
	.align	4
 	.ent	main
main:
# store the content of 1 into the memory location i
	li	$2,0x00000001		# 1
	sw	$2,i
$L2:
# initiation of the first for loop
	lw	$2,i
# the i<=19 condition check
	slt	$3,$2,20
# jump to L5 when not done or else exit loop to to L3
	bne	$3,$0,$L5
	j	$L3
$L5:
#inner part of loop 1
	lw	$2,i
#copy the value of $2 -> $3, by using an addition with 0
	addi	$3,$2,0
#multiple the value of i by 4 to find the offset address 
# where the value in array B will be stored
	sll	$2,$3,2
#load B (begin array) and add the offset of the array to find the
#location it needs to be stored
	la	$3,B
	addu	$2,$2,$3
	addi	$3,$2,0
#store the value of i into the the correct location in the B array
	lw	$2,i
	sw	$2,0($3)
$L4:
# raise the value of i by 1 (by using a tmp value) and jump 
# to the begin of the loop
	lw	$3,i
	addu	$2,$3,1
	move	$3,$2
	sw	$3,i
	j	$L2
$L3:
# init of C and i (counter for loop)
	li	$2,0x0000002a		# 42
	sw	$2,C
	li	$2,0x00000001		# 1
	sw	$2,i
$L6:
# inner of loop 2, the for loop condition check, jump to L7 when done
# else exec L9
	lw	$2,i
	slt	$3,$2,20 
	bne	$3,$0,$L9
	j	$L7
$L9:
#calculate the offset for array A
	lw	$2,i
	move	$3,$2
	sll	$2,$3,2
#set the array of storage in A into $2
	la	$4,A
	addu	$3,$2,$4
	move	$2,$3
#calculate offset of B
	lw	$3,i
	move	$4,$3
	sll	$3,$4,2
#set initial start to -4 to accomplish i-1
	la	$4,B    	
	addi	$4,$4,-4	
	addu	$3,$3,$4
	move	$4,$3
#load value of B and C, compare and store in location in array A
	lw	$3,0($4)
	lw	$4,C
	addu	$3,$3,$4
	sw	$3,0($2)
$L8:
# same as L4, except the jump goes to L6
# raise the value of i by 1 (by using a tmp value) and jump 
# to the begin of the loop
	lw	$3,i
	addu	$2,$3,1
	move	$3,$2
	sw	$3,i
	j	$L6
$L7:
# the print statements
	li	$v0,1
	la	$3,A
	lw	$a0,76($3)
	syscall		#print A[19]	

	li $v0, 4        # system call code for print_str
        la $a0, space    # address of string to print
        syscall          # print the string "  "

	li $v0, 1
        la	$3,B
	lw	$a0,76($3)
	syscall		#print B[19]

	li $v0, 4        # 
        la $a0, space    # 
        syscall          # print the string "  "

	li	$v0,1
	la	$3,i
	lw	$a0,0($3)
	syscall		#print i
$L1:
	.end	main