MIPS：地址超出范围错误

Question

我正在尝试转换此C代码：

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

进入MIPS，我无法弄清楚是什么导致地址超出范围错误

#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

任何帮助都将不胜感激。

Answer 1

lbu $t1, '+'

'+'不是有效地址。你可能意味着

li $t1, '+'

无论如何要记住任何体面的C编译器都会为你将C转换为MIPS。