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/*
 * @test
 * @bug 8362394
 * @summary Test that repeated stacked string concatenations do not
 *          consume too many compilation resources.
 * @requires vm.compiler2.enabled
 * @library /test/lib /
 * @run main/othervm -XX:-OptoScheduling compiler.stringopts.TestStackedConcatsMany
 * @run main/othervm -XX:-TieredCompilation -Xcomp -XX:-OptoScheduling
 *                   -XX:CompileOnly=compiler.stringopts.TestStackedConcatsMany::f
 *                   compiler.stringopts.TestStackedConcatsMany
 */

// The test uses -XX:-OptoScheduling to avoid the assert "too many D-U pinch points" on aarch64 (JDK-8328078).

package compiler.stringopts;

import jdk.test.lib.Asserts;

public class TestStackedConcatsMany {

    public static void main (String... args) {
        new StringBuilder(); // Trigger loading of the StringBuilder class.
        String s = f();
        String z = "xy";
        for (int i = 0; i < 24; i++) {
            z = z + z;
        }
        Asserts.assertEQ(s, z);
    }

    static String f() {
        String s = "xy";
        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        s = new StringBuilder().append(s).append(s).toString();
        s = new StringBuilder().append(s).append(s).toString();

        return s;
    }
}