问MIPS程序集: INT到STRING函数只有2个字符(切断最后一个字符)

EN

 itoa:
  la      $t0, int_buf   # load buf
  add     $t0, $t0, 30   # seek the end
  sb      $0, 1($t0)     # null-terminated str
  li      $t1, '0'  
  sb      $t1, ($t0)     # init. with ascii 0
  li      $t3, 10        # preload 10
  beq     $t8, $0, iend  # end if 0
loop:
  div     $t8, $t3       # a /= 10
  mflo    $t8
  mfhi    $t4            # get remainder
  add     $t4, $t4, $t1  # convert to ASCII digit
  sb      $t4, ($t0)     # store it
  sub     $t0, $t0, 1    # dec. buf ptr
  bne     $t8, $0, loop  # if not zero, loop
  addi    $t0, $t0, 1    # adjust buf ptr
iend:
  move    $a1, $t0       # return the addr.
  jr      $ra            # of the string

li    $v0, 15
move  $a0, $s6      
move  $t8, $s2
jal   itoa
li    $a2, 4 //problem was only 2 digits selected here!
syscall