// This code uses a loop to generate values for a small three element
// array stored at location 80; it accesses the array by using an offset 
// from R4, which is initialized to 0.
// It then adds the three elements together, this time by setting R4
// to the address of the middle element (84), and using load instructions
// that offset (both positively and negatively) from this value. The final
// answer (ie., the sum) is stored in R7, and in memory location 92 (0x5c).

00000000 20010003   ADDI R1, R0, 3    // initialize loop counter
00000004 20020014   ADDI R2, R0, 20   // r2 is used to generate values
00000008 00002020    ADD R4, R0, R0   // r4 = array offset, initially 0
0000000C 34430009    ORI R3, R2, 9    // create a value
00000010 AC830050     SW R3, 80(R4)   // store value in memory
00000014 2042000A   ADDI R2, R2, 10   // get ready for next value
00000018 2021FFFF   ADDI R1, R1, -1   // decrement loop counter
0000001C 20840004   ADDI R4, R4, 4    // increment array offset
00000020 1401FFFA    BNE R1, R0, 0xc  // branch back to "ori" instruction
00000024 20040054   ADDI R4, R0, 84   // reinitialize array offset, this time 
                                      // to middle element
00000028 8C85FFFC     LW R5, -4(R4)   // get first array element
0000002C 8C860000     LW R6, 0(R4)    // get second array element
00000030 00C53820    ADD R7, R6, R5   // add first 2 elements
00000034 8C880004     LW R8, 4(R4)    // get third element 
00000038 00E83820    ADD R7, R7, R8   // add to sum
0000003C AC870008     SW R7, 8(R4)    // store result after array (mwmory 
                                      // location 92, or 0x5c)
00000040 08000010      J 0x40         // jump to self