a guest Apr 21st, 2019 63 Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
  1.     .text
  2. main:   la $t9,str      #register address will always be the start of str
  3.     li $t1,0        #t1 and t2 hold comparing bytes
  4.     li $t2,0   
  6. in: li $v0,12       #prepares for syscall 12 where 1 letter is allowed to be input
  7.     syscall        
  8.     move $t1,$v0        #loads the input into t1
  9.     beq $t1,0x0a,in
  10.     la $t0,str      #resets t0 (current address register)
  11.     j fowd
  13. fowd:   lb $t2,($t0)        #loads current byte into t2
  14.     beq $t2,$t1,shift   #if this is the letter we are looking for, we go ahead and start moving forward to shift
  15.     addi $t0,$t0,1      #otherwise, we move forward until it's the right letter
  16.     j fowd
  18. shift:  lb $t3,1($t0)       #gets letter after
  19.     beqz $t3,bkshft     #if next byte is zero, start moving backwards and shifting
  20.     addi $t0,$t0,1      #otherwise, keep looking forward
  21.     j shift
  23. bkshft: lb $t5,($t0)        #grab letter
  24.     sb $t5,1($t0)       #place letter one forward
  25.         sub $t0,$t0,1       #move back a byte (starting from end of string)
  26.     beq $t5,$t1,in      #if we are at the right place, then our insertion is complete and we are ready for the next letter
  27.     j bkshft
  31.     .data
  32. str:    .asciiz "abcdefghijklmnopqrstuvwxyz"
  33. buffer: .space 30
RAW Paste Data
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. OK, I Understand