Question

我不确定我的代码到底发生了什么。当我尝试使用lw和sw交换数组中的值时，会出现问题。该程序应该按升序对数组进行排序，然后输出。

.text
.globl __start
__start:

    la $t0, array                 # t0 = address of array
    lw $t1, count                 # t1 = count, exit loop when it goes to 0

    loop:  
        lw $t2, ($t0)             # t2 = element in array

        lw $t4, count             # t4 = count, for innerLoop
        add $t3, $t0, 4           # t3 = address of next array element

        innerLoop: 
            lw $t5, ($t3)         # t5 = element in array

            ble $t2, $t5, greater # if element in t2 is >= element in t5 goto greater
            sw $t2, ($t3)         # store element in t2 into the t3 array address
            sw $t5, ($t0)         # store element in t5 into the t0 array address
            lw $t2, ($t0)         # t2 = new element in t0 array address

            greater:
            add $t4, $t4, -1      # t1 -- -> counter --
            add $t3, $t3, 4       # t3 = address of next array element 
            bnez $t4, innerLoop   # if innerLoop count != 0 go to innerLoop

        add $t1, $t1, -1          # t1 -- -> counter --
        addi $t0, $t0, 4          # t0 = address of next array element
        bnez $t1, loop            # if loop count != 0 go to loop

    la $t0, array                 # t0 = address of array
    lw $t1, count                 # t1 = count, exit loop when it goes to 0

    lw $t2, ($t0)                 # lw in address t0 into t2
    move $a0, $t2                 # Display the first element in array 
    li $v0, 1
    syscall

    add $t1, $t1, -1              # t1 -- -> counter --
    add $t0, $t0, 4               # increment counter to point to next word

    displayLoop:    
        lw $t2, ($t0)             # t2 = next element in array

        la $a0, comma             # Display ", "
        li $v0, 4                 # a0 = address of message
        syscall                   # v0 = 4 which indicates display a string

        move $a0, $t2             # Display element in array 
        li $v0, 1
        syscall

        add $t1, $t1, -1          # t1 -- -> counter --
        add $t0, $t0, 4           # increment counter to point to next word
        bnez $t1, displayLoop     # if count != 0 the go to displayLoop

    la $a0, crlf                  # Display "cr/lf"
    li $v0, 4                     # a0 = address of message
    syscall                       # v0 = 4 which indicates display a string

    li $v0, 10                    # End Of Program
    syscall 

.data
array: .word 3, 4, 2, 6, 12, 7, 18, 26, 2, 14, 19, 7, 8, 12, 13
count: .word 15
comma: .asciiz ", "
crlf:   .asciiz "\n"

这是我得到的输出：

2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 26, 167780396, 19, 18, 15, 14, 13, 12, 12, 8, 7

Answer 1

我设置外部循环if语句来检查t1是否大于1，因为当它变为1时t0是数组中的最后一个元素而没有其他任何东西需要检查

在装配中加载和存储单词

1 个答案: