已在pcspim下编译通过
##
##################################################
#
#### programed by stevie zou ###
# purpose:to swap two values #
##### 10-15-2008 ######### ################
##
############# text segment ###############
.text
.globl main
main: la $t0, number #读取两个整数并放入寄存器$t1,$t2
lw $t1, 0($t0)
lw $t2, 4($t0)
li $v0, 4 #打印msg1
la $a0, msg1
syscall
li $v0, 1 #打印转换前$t1中的值
move $a0, $t1
syscall
li $v0, 4 #打印msg2
la $a0, msg2
syscall
li $v0, 1 #打印转换前$t2中的值
move $a0, $t2
syscall
move $t3, $t1 #关键部分，在寄存器间move数据
move $t1, $t2
move $t2, $t3
li $v0, 4 #打印msg3
la $a0, msg3
syscall
li $v0, 1 #打印转换后$t1中的值
move $a0, $t1
syscall
li $v0, 4 #打印换行符 /n
la $a0, msg4
syscall
li $v0, 1 #打印转换后$t2中的值
move $a0, $t2
syscall
########### data segment ##############
.data
number: .word 12,34
msg1: .asciiz "the first number is:/n"
msg2: .asciiz "/nthe second number is:/n"
msg3: .asciiz "/nnow they are swapped as:/n"
msg4: .ascii "/n"
## end of file
程序运行结果为：