添加位x32 mips assembly

$a0, "11111111111100000001111111111110"    #= -4064

$a1, "00000000001000111000000000000010"   # = 9088

$a2, resultSpace 
$a3, representation                #one's or two's complement

li $t4, 0 #carry flag 

lb $t0, 32($a0)
lb $t1, 32($a1)

move $t5, $a0

loop: 
lb $t0, 32($a0)
lb $t1, 32($a1)


add $t3, $t0, $t1


sb $t3, 32($a2)

sub $a2, $a2, 1 
sub $a0, $a0, 1
sub $a1, $a1, 1 


addi $t4, $t4, 1 # increments 
bne $t4, 32, loop