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For loops in MIPS assembly

I am having trouble mimicking my processor properly and I think I have narrowed it down to the program I give it to her.

1.  li    $R1, 0
2.  li    $R2, 0x100
3.  li    $R6, 1
4.  li    $R8, 0
5.  li    $R9, 20

6.  lw    $R3, 0($R1)
7.  lw    $R4, 4($R1)
8.  add  $R5, $R3, $R4
9.  srlv    $R5, $R5, $R6
10. sw   $R5, 0($R2)
11. addi    $R1, $R1, 4
12. addi    $R2, $R2, 4
13. addi    $R8, $R8, 1
14. slt     $R7, $R8, $R9
15. bne  $R7, $zero,  -9

It has to iterate through the bottom 20 times and then exit. I'm especially unsure about the branch instructions, but I can't seem to find anything wrong with it: /

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So you start with R8 as 0 and R9 as 20. Then in step 13 you add one of R8 and then set R7 if R8 is less than R9 (which it will be in the first 19 iterations). Then you log in if R7 is installed. I think Loop suits me.



I don't remember what bnq does ... Doesn't work here?

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