anyone here know mips (assembly)?

[pzt]

hey if you know mips maybe you can help me out, im native to java and python so this is leaving me scratching my head. my problem is to sort an array of a fixed length. I think what I have written is a viable solution, but am getting errors when i compile.

			.text			.globl main	main:		la 	$a0, Array		# sets the base address of the array to $a0	loop:		lw 	$t0, 0($a0) 		# sets $t0 to the current element in array			lw 	$t1, 4($a0)		# sets $t1 to the next element in array			blt	$t1, $t0, swap		# if the following value is greater, swap them			addi	$a0, $a0, 4		# advance the array to start at the next location from last time			j	loop			# jump back to loop so we can compare next two elements				swap:		sw	$t0, 4($a0)		# store the greater numbers contents in the higher position in array (swap)			sw	$t1, 0($a0)		# store the lesser numbers contents in the lower position in array (swap)			li	$a0, 0			# resets the value of $a0 back to zero so we can start from beginning of array			j	loop			# jump back to the loop so we can go through and find next swap 	 			.data 			 	Array:		.word 	14, 12, 13, 5, 9, 11, 3, 6, 7, 10, 2, 4, 8, 1 

 

it says it is getting an array out of bounds error on line 6 which is where 'loop:" begins

 

any ideas? thanks!

[_ASSASSIN_]

lol, assembly coders are rare. But I have a friend who codes exclusively in assembly but sadly he's not on these forums, I'll see to it to get a response from him about this, see if he knows

[pzt]

yeah i know its rare, its just an assignment for school, and it sucks hahah.

thanks tough for the response!

[_ASSASSIN_]

yeah i know its rare, its just an assignment for school, and it sucks hahah.

thanks tough for the response!

might want to quote me next time

[_ASSASSIN_]

ok, so my friend gave a response, he's asking error it gives when compiling

[MikeD]

I know assembly in general, not this one in specific, but I'd say that the error is in swap, when you load address 0 to $a0 instead of Array. When you jump back to loop you try to access address 0.

This is assuming everything else works as I think it does!

I might be completely wrong though, I haven't messed with assembly like that in a while.

Also, where is the loop/main termination? I don't think you can go on forever!

[MdX MaxX]

How does your code know when to stop?

 

Seems like your code eventually gets to the last element in the array, loads that into $t0, then tries to load the next element into $t1, but there is no next element.

 

After the addi, you should have a instruction that branches if your offset value $a0 ends up being equal to the max offset value (52 in this case, since there are 13 elements in that array) and then proceed to end the program.

 

EDIT: And yes, like MikeD said, you shouldn't be setting $a0 to zero after the swap.  You should repeat the 'la $a0, Array' instruction.