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homework2-fa2008

# homework2-fa2008 - CSE 331 Computer Organization and Design...

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CSE 331: Computer Organization and Design Fall 2008 Homework #2 Points: 10 (Pair programming assignment) Due: 11:55 PM, Thursday, Sept 11, 2008 Using SPIM, write a program that sums up the first or last n elements of a data array. As shown in the assembly code below, a 10-word data array is allocated in the data segment in memory; it contains ten integers. The first three instructions starting from label main: ask the user to input a 1 to indicate that the summation should start at the beginning of the array ( item ) and work forward, or a -1 to indicate that the summation should start at the end of the array ( last ) and work backwards. The next three instructions ask the user to input the integer n between 0 and 10. If the integer is 0, the program is to return 0; else, it should sum up the first or last n elements of the data array and return the sum. The result should be stored in register \$t2 and then printed out. (Hint: you can use instruction la \$s0, item to load the address of the first word of the array into register \$s0.)

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