MIPS：解決超出範圍錯誤

Question

我試圖把這種C代碼：

if (op == '+') { 
     acc += val; 
    } 

到MIPS，我想不出是什麼原因造成的地址超出範圍的錯誤

#reads user input for the op 
li $v0, 12  # system call number for operator 
syscall   # reads the integer 
sw $v0, op  # stores the user input in op 


lw $t0, op  # stores op in $t0 
lbu $t1, '+'  # stores '+' in $t1 

# "if" statement 
bne $t0, $t1, Else # branches if op is not equal to + 
lw $t2, acc  # stores acc in $t2 
lw $t3, val  # stores val in $t3 

add $t2, $t2, $t3 # adds $t2 and $t3 and stores the sum in $t2 

任何幫助，將不勝感激。

Answer 1

lbu $t1, '+' 

'+'不是有效地址。你可能的意思是

li $t1, '+' 

無論如何要記住，任何像樣的C編譯器都會將C轉換爲MIPS。