我正在尝试在 mips 中提出一个基本的“如果是则执行此操作，如果否则退出”算法（使用 spim 模拟器）。但是，无论是否给出了是或否（在这种情况下是 y 或 n），bne 总是分支出来。我对 mips 很陌生，所以我可能遗漏了一些大的东西……或者我不知道的小东西。这是我所拥有的：
.data
welcome: .asciiz "Hello World!\n"
begin: .asciiz "\nEnter a mathematical operator: "
question: .asciiz "\nWould you like to solve a problem (y/n)? "
back: .asciiz "You wrote "
buffer: .space 2
yes: .asciiz "y"
exiting: .asciiz "exiting"
.text
.globl main
main:
li $v0, 4 # syscall 4 (print_str)
la $a0, welcome # argument: string
syscall # print the string
Loop:
# ASK IF WANT TO SOLVE A QUESTION
li $v0, 4 # syscall 4 (print_str)
la $a0, question # argument: string
syscall
# GET INPUT FROM USER
li $v0, 8 # get input
la $a0, buffer # load byte space into address
li $a1, 2 # allot the byte space for string
move $t0,$a0 # save string to t0
syscall
#EDIT
lb $t1, yes #previously la $t1, yes
lb $t0, 0($t0) #new
#END EDIT
bne $t0, $t1, Exit
########IF YES, PRINT MESSAGE
########this code is only for testing and doesn't really mean anything
########so you can ignore it
li $v0, 4 # syscall 4 (print_str)
la $a0, begin # argument: string
syscall
li $v0, 8 #get input
la $a0, buffer #load byte space into address
li $a1, 20 # allot the byte space for string
move $t0,$a0 #save string to t0
syscall
la $a0,back #load and print "you wrote" string
li $v0,4
syscall
la $a0, buffer #reload byte space to primary address
move $a0,$t0 # primary address = t0 address (load pointer)
li $v0,4 # print string
syscall
j Loop
########### END IF YES
Exit:
li $v0, 4
la $a0, exiting
syscall
li $v0, 10
syscall
jr $ra # return to caller
所以问题是 $t0 和 $t1 永远不会相等，无论用户输入什么。我需要做什么才能正确比较这两个值？