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/* Source for debugging optimimzed code test.
cc -g -O -o optimize optimize.c
*/
int callee();
int test_opt;
int main()
{
int a,b,c,d,e,f,g,h;
a = 10;;
/* Value propagate
*/
b = 2 * a + 1;
c = 3 * b + 2;
/* Re-use expressions
*/
d = (2 * a + 1) * (3 * b + 2);
e = (2 * a + 1) * (3 * b + 2);
/* Create dead stores--do lines still exist?
*/
d = (2 * a + 1) * (3 * b + 2);
e = (2 * a + 1) * (3 * b + 2);
d = (2 * a + 1) * (3 * b + 2);
e = (2 * a + 1) * (3 * b + 2);
/* Alpha and psi motion
*/
if( test_opt ) {
f = e - d;
f = f--;
}
else {
f = e - d;
f = f + d * e;
}
/* Chi and Rho motion
*/
h = 0;
do {
h++;
a = b * c + d * e; /* Chi */
f = f + d * e;
g = f + d * e; /* Rho */
callee( g+1 );
test_opt = (test_opt != 1); /* Cycles */
} while( g && h < 10);
/* Opps for tail recursion, unrolling,
* folding, evaporating
*/
for( a = 0; a < 100; a++ ) {
callee( callee ( callee( a )));
callee( callee ( callee( a )));
callee( callee ( callee( a )));
}
return callee( test_opt );
}
/* defined late to keep line numbers the same
*/
int callee( x )
int x; /* not used! */
{
test_opt++; /* side effect */
return test_opt;
}
/* end */
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