TestRemoveEmptyCountedLoop.java

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/**
 * @test
 * @bug 8289748
 * @summary SIGFPE caused by C2 IdealLoopTree::do_remove_empty_loop
 * @key stress randomness
 *
 * @run main/othervm -XX:-TieredCompilation -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:+StressGCM
 *                   -XX:CompileOnly=compiler.loopopts.TestRemoveEmptyCountedLoop::test*
 *                   compiler.loopopts.TestRemoveEmptyCountedLoop
 * @run main/othervm -XX:-TieredCompilation -Xcomp -XX:+UnlockDiagnosticVMOptions -XX:+StressGCM -XX:StressSeed=2160808391
 *                   -XX:CompileOnly=compiler.loopopts.TestRemoveEmptyCountedLoop::test*
 *                   compiler.loopopts.TestRemoveEmptyCountedLoop
 */

package compiler.loopopts;

public class TestRemoveEmptyCountedLoop {

    public static void test1() {
        int k = 3;
        for (int i=9; i>0; i--) {
            for (int j=2; j<i; j++) {
                k = k;
                k = (1 % j);
            }
        }
    }

    public static void test2() {
        int k = 3;
        for (int i=9; i>0; i--) {
            int j = 2;
            do {
                try {
                    k = k;
                    k = (1 % j);
                } catch (Exception e) {}
            } while (++j < i);
        }
    }

    public static void main(String[] args) {
        test1();
        test2();
        System.out.println("Test passed.");
    }
}