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POWhy is this MIPS assembly language code crashing my SPIM simulator?
 

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  1. POWhy is this MIPS assembly language code crashing my SPIM simulator?
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    <p>In case the comments aren't too clear I'll describe what this is supposed to do. Takes two arrays of length 8 and multiplies each corresponding element and stores the product into a new array. In other words, for array1 [1,2,...,8] and array2 [1,2,...,8] the contents of array 3 will equal [1,4,...,64].</p> <pre><code> .data array1: .byte 2, 2, 2, 2, 2, 2, 2, 2 array2: .byte 41, 3, 5, 7, 19, 2, 4, 4 array3: .space 40 #This must be declared this way result: .asciiz "Product = " .globl main .text main: la $s0, array1 #Load address of array1 to s0 la $s1, array2 #Load address of array2 to s1 la $s2, array3 #Load address of array3 to s2 lb $t0, 0($s0) #Load first byte of array1 to t0 lb $t1, 0($s1) #Load first byte of array2 to t1 li $t8, 8 #Load 8 to t0 for our loop. We'll call it N loop: beq $t0, 0, next #if the variable X is 0, go to next, else add $t2, $t1, $t2 #add t2 and Y, store in t2 addi $t0, $t0, -1 #decrement X j loop #jump to loop next: sw $t2, 0($s2) #Store the product into array3 as a word. li $t2, 0 #Load 0 to t2 to reset it before jumping back to loop addi $t8, $t8, -1 #decrement t8 add $s0, $s0, 1 #Shift to next byte in array1 lb $t0, 0($s0) #Load first byte of array1 to t0 add $s1, $s1, 1 #Shift to next byte in array2 lb $t1, 0($s1) #Load first byte of array2 to t1 add $s2, $s2, 4 #Shift to next word in array3 bne $t8, 0, loop #If t8 is not yet 0 (we haven't interated through all elements of the list), go to loop. li $t8, 8 #Load 8 to t8 add $s2, $s2, -32 #Shift to first word of array3 j print1 #jump to print procedure print1: li $v0, 4 #load system call code for print string la $a0, result #Load address of result to a0 syscall #print result j print2 #jump to print2 procedure print2: li $v0, 1 #Load system call for print integer lw $a0, 0($s2) #Load first word of array3 to a0 syscall #print Integer bne $t8, 0, print2 #if t8 is not equal to 8, loop to print2 procedure j close #Else jump to close close: li $v0, 10 #load system call code for terminate syscall #return control to system </code></pre>
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    1. USWhyAyala
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    1. CORuns fine in my SPIM simulator -- doesn't work, but runs fine. Considering how you've said that it's crashed but haven't provided an error message this is the most anyone can say.
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      1. POWhy is this MIPS assembly language code crashing my SPIM simulator?
      1. USKonrad Lindenbach
    2. COIn your `print2` loop you are not advancing `$s2` and not decrementing `$t8`. That should cause an endless loop, but no crash. Other than that I didn't spot anything obviously wrong. Update: oh, and `$t2` isn't zeroed the first time entering the `loop`.
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      1. POWhy is this MIPS assembly language code crashing my SPIM simulator?
      1. USJester
    3. CO@Jester you're right. Amazing what 8 hours of sleep can do for clarity. Thanks for your input.
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      1. POWhy is this MIPS assembly language code crashing my SPIM simulator?
      1. USWhyAyala
 

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