.global add_a
.func add_a


add_a:
    ldr r12, [r0]
    mov r2, #0

again:
    cmp r1, #0
    beq done
    sub r1, #1
    ldr r3, [r0, r2]
    cmp r3, r12
    add r2, r2, #4
    blt again
    mov r12, r3
    b again

done:
    mov r0, r12
    bx lr
    .endfunc