Branches for Positive and Negative

Now, implement the true block and the false block. One adds the current entry to the sum of negatives, the other adds it to the sum of positives.

Check that you don't have the blocks confused. This is a frequent mistake.


## Registers:
##  $8 -- count                     
##  $9 -- pointer to the array entry
## $10 -- current array entry       
## $11 -- sum of all integers       
## $12 -- sum of negative integers
## $13 -- sum of positive integers
## $14 -- pos. or neg. flag
## $15 -- SIZE of the array

# while  count < SIZE do
loop:    beq      $8,$15,done 
         sll      $0,$0,0        #  branch delay


# get entry, add to sum
         lw       $10,0($9)      #  get entry
         sll      $0,$0,0        #  load delay
         addu     $11,$11,$10    #  add to sum

#  test neg. or pos.
         slti     $14,$10,0      #  set flag if entry is neg
         bne      $14,$0,neg    #  branch if negative
         sll      $0,$0,0        #  branch delay
         
              $13,$13,$10   #  positive: add to PLUS
         
         j        
         
         sll      $0,$0,0        #  branch delay
         

neg:          $12,$12,$10   #  negative: add to NEG

ifend:   addiu    $8,$8,1        #  count++
         addiu    $9,$9,4        #  point at next entry
         j        loop
         sll      $0,$0,0        #  branch delay

done:    sll      $0,$0,0        #  target for branch

        .data
size:   .word  17
array:  .word  12, -1, 8, 0, 6, 85, -74, 23, 99, -30, 30, 95, 4, 7, 10, 28, 14

Answer:

Branches for Positive and Negative

QUESTION 14: