[assembly] ascending sort 코드를 작성했는데 정상적으로 작동하지 않고 있습니다. 이유가 뭘까요?

; 5개의 정수(음수 포함)를 입력받고 이를 오름차순으로 정렬하여 출력한다.
 
            AREA text, CODE
            ; This section is called "text", and contains code
 
            ENTRY
 
            IMPORT   scan
            IMPORT   print_char
            IMPORT   divide
            IMPORT   print_number
            IMPORT   print
 
            mov      r10, #0×80000004  
            add      r9, r9, #10        
            mov      r6, #5            
 
five_input
            cmp      r6, #0             
            bl       scan
            bl       print_char
            cmp      r0, #10            
            moveq    r0, #13
            bleq     print_char         
            streq    r4, [r10], #4       
 
            moveq    r4, #0             
            beq      sort         
 
            cmp      r0, #32            
            subeq    r6, r6, #1         
            streq    r4, [r10], #4                                        
 
            moveq    r4, #0             
            beq      five_input
 
            sub      r0, r0, #‘0’       
            mul      r4, r9, r4         
            add      r4, r4, r0         
            b        five_input        
 
sort
        mov      r7, #0
        mov      r8, #1
 
loop
        cmp      r7, #4
        bhs      end_loop
        cmp      r8, #4
        bhs      next_iteration
 
        sub      r0, r4, r5
        blt      swap
 
next_iteration
        b        loop
 
swap
        mov      r5, r4
        mov      r4, r0
        b        next_iteration
 
end_loop
        mov      r0, r4
        bl       print_number
        b        exit
 
exit   
 
 
      ; Stnadard exit code : SWI 0×123456, calling routine 0×18
      ; with argument 0×20026
      mov   r0, #0×18
      mov   r1, #0×20000   ; build the "difficult" number
      add   r1, r1, #0×26   ; in two stems
      SWI   0×123456      ; "software interrupt" = sys
 
 
      END