Question

I am trying to turn this C code:

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

into MIPS, and I can’t figure out what is causing the address out of range error

#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

Any help would be appreciated.

Answer 1

lbu $t1, '+'

‘+’ is not a valid address. You probably meant

li $t1, '+'

Anyway remember that any decent C compiler will convert C to MIPS for you.