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