Load file array.asm into the MARS editor and carefully read the last 30 lines or so (starting with the comment # Global variables). Assemble and run the program. Here are some things to check: look for the array elements in the Data Segments window; make sure the values in the local variable registers $s0$s2 are what you expect when the program is finished. Modify the code in array.asm so that in addition to putting the sum of the array elements in the local variable sum, it also updates the variable max with the maximum value from the array. Get the logic rightdont just write something that puts a value of 4 into the $s3 register! To create an if statement you will need a branch instructionthe only two kinds of branch instructions you are allowed to use are beq and bne; you will probably need to use an slt instruction as well. Document each instruction you add with a C-like comment

FILE array.asm (code below)

# array.asm

# Start-up and clean-up code copied from stub1.asm

# BEGINNING of start-up & clean-up code. Do NOT edit this code. .data exit_msg_1: .asciiz "***About to exit. main returned " exit_msg_2: .asciiz ".*** " main_rv: .word 0 .text # adjust $sp, then call main addi $t0, $zero, -32 # $t0 = 0xffffffe0 and $sp, $sp, $t0 # round $sp down to multiple of 32 jal main nop # when main is done, print its return value, then halt the program sw $v0, main_rv la $a0, exit_msg_1 addi $v0, $zero, 4 syscall nop lw $a0, main_rv addi $v0, $zero, 1 syscall nop la $a0, exit_msg_2 addi $v0, $zero, 4 syscall nop addi $v0, $zero, 10 syscall nop # END of start-up & clean-up code.

# Global variables .data # int abc[ ] = {-32, -8, -4, -16, -128, -64} .globl abc abc: .word -32, -8, -4, -16, -128, -64

# Hint for checking that the original program works: # The sum of the six array elements is -252, which will be represented # as 0xffffff04 in a MIPS GPR.

# Hint for checking that your final version of the program works: # The maximum of the four array elements is -4, which will be represented # as 0xfffffffc in a MIPS GPR.

# int main(void) # # local variable register # int *p $s0 # int *end $s1 # int sum $s2 # int max $s3 (to be used when students enhance the program)

.text .globl main main: la $s0, abc # p = abc addi $s1, $s0, 24 # end = p + 6 add $s2, $zero, $zero # sum = 0 L1: beq $s0, $s1, L2 # if (p == end) goto L2 lw $t9, ($s0) # $t9 = *p add $s2, $s2, $t9 # sum += $t9 addi $s0, $s0, 4 # p++ j L1 L2: add $v0, $zero, $zero # return value from main = 0 jr $ra