Listing 1-A comparison of C code, 68K, and 21K assembly code 
to calculate the sum of the first three elements of a 10-element array.
C code segment
int values[10];
int sum = 0;
int *pt = values;
for (count = 0; count < 3; count++)
sum = sum +*pt++;
68K code segment
section data
VALUES:	DS.L 40
section code
// Clear the sum variable
MOVE.L #0, D0
// Set up the pointer to the array
MOVE.L #VALUES, A0
// Calculate the sum
ADD.L (A0)+, D0	// Fetch, add
ADD.L (A0)+, D0	// and increment
ADD.L (A0)+, D0
// A0 pointing to VALUES[3]
21K code segment
.segment/dm seg_dmda;
.var VALUES[10];
.endseg;
.segment/pm seg_pmco;
// Clear the sum variable
R0 = 0;
// Set up the pointer to the array
I4 = VALUES;
// Set up address modify constant 
M4 = 1;
// Calculate the sum
R1 = dm(I4, M4);	// Fetch
R0 = R0 + R1;	// and add
R1 = dm(I4, M4);	// Fetch
R0 = R0 + R1;	// and add
R1 = dm(I4, M4);	// Fetch
R0 = R0 + R1;	// and add
// I4 pointing to VALUES[3];

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