#
# ELECTRAN QUESTION 9.
#
# The first unsigned halfword gives the number of data values to add together.
# Then the data values follow this given as  unsigned 16-bit values.
# The final memory location allocated with a  'space  2' directive gives the
# memory location to put the result.
#
# No overflow exceptions should result (similar to C-code) when doing the
# addition - any  unsigned overflow should just be ignnored.

# Your key task is to write some MIPS assembly language to add together the
# data values given and put the answer into the  last memory location.
#
# You should write your assembly language below the comment line saying:
# "WRITE ASSEMBLY LANGUAGE SOLUTION BELOW".

.data

vals:

# Number of data values to add together as a unsigned halfword.
.half 5

# The actual data values themselves as "16-bit unsigned values".
.half 0x0010, 0x0020, 0x0030 ,0x0040, 0x0050

# Memory address to put the sum into.  The result should be stored as a unsigned halfword.
# In this case the assembly language should put  0x00F0 onto this memory location.
# However the code should work in general for any given lists of data values.
.space 2


########## WRITE ASSEMBLY LANGUAGE SOLUTION BELOW ##########
    .text
    .globl main

main:
    la  $4, vals      # Load address of vals to register $4
    add $10, $0, $0   # Set initial sum to zero
    lhu $5, 0($4)     # Load "number of numbers" to $5

    # $s0 = i, $s1 = sum

    addi $17, $0, 0
    add  $16, $0, $0
    li $8, 0    # Counter is $8

for:
    beq $8, $5, done
    add $8, $8, 1 #Move to next for loop iteration
    add $4, $4, 2
    lhu $11, 0($4)    #Go to first memloc and get number
    addu $10, $10, $11 # With addu overflow is ignored -> "any  unsigned overflow should just be ignnored." -> Adds to previous sum of numbers.

    j for

done:
    addi $6,$4,2     #Add two to last memory location
    sh  $10, 0($6)   #Store result to that last memory location.

    li $v0 10         # Exit program using system call 10.
    syscall           # syscall 10 (exit)

    #li  $5, 2
    #mult $5, $4
    #mflo $12