####
#
# hankd@engr.uky.edu
# February 28, 2001
#

.data

x:	.word	1
y:	.word	6
z:	.word	7

mes1:	.asciiz	"Initial values of x, y, z:\n"
mes2:	.asciiz	"Final values of x, y, z:\n"
nl:	.asciiz "\n"

####
#
# Main
# 

.text
.globl main

main:
	li	$v0, 4		# print "Initial values of x, y, z:\n"
	la	$a0, mes1
	syscall
	li	$v0, 1		# print x
	lw	$a0, x
	syscall
	li	$v0, 4		# print "\n"
	la	$a0, nl
	syscall
	li	$v0, 1		# print y
	lw	$a0, y
	syscall
	li	$v0, 4		# print "\n"
	la	$a0, nl
	syscall
	li	$v0, 1		# print z
	lw	$a0, z
	syscall
	li	$v0, 4		# print "\n"
	la	$a0, nl
	syscall

	jal	myadd		# myadd()

	li	$v0, 4		# print "Final values of x, y, z:\n"
	la	$a0, mes2
	syscall
	li	$v0, 1		# print x
	lw	$a0, x
	syscall
	li	$v0, 4		# print "\n"
	la	$a0, nl
	syscall
	li	$v0, 1		# print y
	lw	$a0, y
	syscall
	li	$v0, 4		# print "\n"
	la	$a0, nl
	syscall
	li	$v0, 1		# print z
	lw	$a0, z
	syscall
	li	$v0, 4		# print "\n"
	la	$a0, nl
	syscall

	li	$v0, 10		# exit()
	syscall

####
#
# Addition routine:
#
# x = y + z
# 

.text
.globl myadd

myadd:
	la	$t0, y		# t0 = y
	lw	$t0, 0($t0)
	la	$t1, z		# t1 = z
	lw	$t1, 0($t1)
	add	$t2, $t0, $t1	# t2 = y + z
	la	$t0, x		# x = t2
	sw	$t2, 0($t0)

	jr	$ra		# return