1 /* Source for debugging optimimzed code test.
2 
3     cc -g -O -o optimize optimize.c
4 */
5 int callee();
6 int test_opt;
7 
8 int main()
9 {
10    int a,b,c,d,e,f,g,h;
11 
12    a = 10;;
13 
14    /* Value propagate
15     */
16    b = 2 * a + 1;
17    c = 3 * b + 2;
18 
19    /* Re-use expressions
20     */
21    d = (2 * a + 1) * (3 * b + 2);
22    e = (2 * a + 1) * (3 * b + 2);
23 
24    /* Create dead stores--do lines still exist?
25     */
26    d = (2 * a + 1) * (3 * b + 2);
27    e = (2 * a + 1) * (3 * b + 2);
28    d = (2 * a + 1) * (3 * b + 2);
29    e = (2 * a + 1) * (3 * b + 2);
30 
31    /* Alpha and psi motion
32     */
33    if( test_opt ) {
34        f = e - d;
35        f = f--;
36    }
37    else {
38        f = e - d;
39        f = f + d * e;
40    }
41 
42    /* Chi and Rho motion
43     */
44    h = 0;
45    do {
46        h++;
47        a = b * c + d * e;  /* Chi */
48        f = f + d * e;
49        g = f + d * e;      /* Rho */
50        callee( g+1 );
51        test_opt = (test_opt != 1);  /* Cycles */
52    } while( g && h < 10);
53 
54    /* Opps for tail recursion, unrolling,
55     * folding, evaporating
56     */
57    for( a = 0; a < 100; a++ ) {
58        callee( callee ( callee( a )));
59        callee( callee ( callee( a )));
60        callee( callee ( callee( a )));
61    }
62 
63    return callee( test_opt );
64 }
65 
66 /* defined late to keep line numbers the same
67 */
68 int callee( x )
69     int x;      /* not used! */
70 {
71     test_opt++; /* side effect */
72 
73     return test_opt;
74 }
75 
76 /* end */