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MIPS: Print array in columns (SPIM)

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MIPS: Print array in columns (SPIM)

 
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  #1
Jun 29th, 2009
I have written a code that prints array in 6 columns:
Assembly Syntax (Toggle Plain Text) 
  1. # -----
  2. # Print array elements.
  3.  
  4.  
  5. 	li 	$t1, 0 
  6. 	la 	$s0, py_sars
  7.  
  8. print_lp1: 
  9. 	bgt 	$t1, 59, print_end1
  10.  
  11. 	lw $a0, 0($s0)            		#get the value pointed by s0
  12. 	li $v0, 1                 		#print int
  13. 	syscall
  14.  
  15. 	la 	$a0, space
  16. 	li 	$v0, 4                 		#print space between each output
  17.   	syscall
  18.  
  19. 	addi 	$t1, $t1, 1			#increment counter for next element
  20. 	addi 	$s0, $s0, 4
  21. 	rem	$t5, $t1, 6			#print areas in 6 columns
  22. 	beq	$t5, $zero, newline	
  23. 	j print_lp1
  24.  
  25. newline:
  26. 	la	$a0, new_ln
  27. 	li	$v0, 4				#print newline
  28. 	syscall
  29. 	j print_lp1
  30.  
  31. print_end1:

I can't get the elements aligned however.
We can asume that the longest length of the integer is 8, and must be right justified.
Could you please guide me on how to do this?
Thanks.
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Re: MIPS: Print array in columns (SPIM)

 
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  #2
Jun 29th, 2009
- format integer as a string in some memory buffer
- measure it's length
- output 8-len spaces
- output buffer
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Re: MIPS: Print array in columns (SPIM)

 
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  #3
Jun 29th, 2009
Use a static buffer 256 or so bytes in size. Plenty of room!

You can subtract the current add new character position from the buffer base to get your index. Do a modulus operation and advance that many slots by inserting spaces.
OR you can have a moving partition.

NEXT = THIS + 12 space.
print column entry,
If THIS < NEXT
SKIP = NEX - THIS print skip spaces.

OR prefill entire buffer with spaces (0x20).
Then merely skip, no fill needed since its prefilled.
But don't forget your ASCIIz terminator after the last column!
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Re: MIPS: Print array in columns (SPIM)

 
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  #4
Jun 29th, 2009
You can also print character by character but your column position logic remains the same. Instead of inserting spaces, write spaces.
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Re: MIPS: Print array in columns (SPIM)

 
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  #5
Jun 30th, 2009
Thanks all! Working on that part of my program now.
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