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itoa procedure (assembly MIPS)

Discussion in 'Assembly Language Programming (ALP) Forum' started by UnSourCeR, Dec 25, 2011.

  1. UnSourCeR

    UnSourCeR New Member

    Hello, that's my 1st post in your forum :). I have an assignment in assembly MIPS ( i'm not asking for spoon feeding or to make some1 else to do my homework just some tips and suggestions).

    Assignment : Write a procedure (itoa) in assembly MIPS, that converts an integer to a null-terminated ASCII String. Procedure has as arguments in $a0 the integer and in $a1 a pointer to the memory where you should save the string that you produce. Procedure saves in $v0 the number of chars of string (expect the null).

    My Solution:

    Code:
    itoa:	
    	 addi $t0,$zero,10 # t0=10
    	 addi $t1,$t1,a0   # t1=a0
    	 Loop:
    		  div $t1,$t0    #t1/10
    		  mflo $t1      #t1 = quotient
    		  mfhi $t2      #t2 =remainder
    		  addi $t2,$t2,0x30 #Convert to ASCII
    		  addi $sp,$sp,-1 #Make space for 1 byte in the stack
    		  sb $t2,0($sp) #Push t2 in the stack
    		  addi $v0,$v0,1 #v0=v0+1
    		  bne $t1,$zero,Loop #If t1<>0 go to Loop
    	 order:
    	          sw $t0,$v0  #t0=v0
    		  lb $t1,0($sp) #pop the last byte for the stack
    		  addi $sp,$sp,1 #Reduce the stack size by 1 byte
    		  add $t2,$v0,-$t0 #t2=v0-t0
    		  sb $t1,$t2($a1) # savebyte to the proper location of memory
    		  addi $t0,$t0,-1 #t0=t0-1
    		  bne $to,$zero,order #If t0<>0 go to order
    	 sb 0x0,$v($a0) # add null character to the end of the string
         jr $ra
    Soz for my bad english, is this solution right? Do you have any tips for simpler code?Thanks in advance
     
  2. UnSourCeR

    UnSourCeR New Member

    Any tips? in second line i made mistake it is add not addi.
     

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