For Loops in MIPS assembly

Posted by John Moffitt on Stack Overflow See other posts from Stack Overflow or by John Moffitt
Published on 2010-04-24T21:46:03Z Indexed on 2010/04/24 21:53 UTC
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assembly

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for-loop

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homework

I'm having problems getting my processor to simulate correctly and I think I've narrowed it down to the program I'm giving it.

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. bnq  $R7, $zero,  -9

It should iterate through the bottom portion 20 times and then exit. I'm particularly unsure about the branch instruction but I can't find anything wrong with it so : /

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