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/**

 * @test

 * @bug 8233529

 * @summary Verify that correct loops are selected when trying to remove main/post.

 * @run main/othervm -XX:-TieredCompilation -Xbatch

 *                   -XX:CompileCommand=compileonly,compiler.loopopts.TestRemoveMainPostLoops::test

 *                   compiler.loopopts.TestRemoveMainPostLoops

 */

package compiler.loopopts;

public class TestRemoveMainPostLoops {

    static int cnt1 = 0;

    int cnt2 = 0;

    void testCallee() {

        // (5) Only main and post loops are created (no pre loop -> "PeelMainPost") and main is unrolled.

        for (int i = 0; i < 100; ++i) {

            // (4) Inner loop is fully unrolled and removed.

            for (int j = 0; j < 10; ++j) {

                cnt1 += j;

            }

        }

    }

    void test() {

        for (int i = 0; i < 10_000; ++i) {

            // (0) testCallee method is inlined

            testCallee();

            cnt2 = 0;

            // (1) OSR compilation is triggered in this loop.

            // (2) Pre-/main-/post loops are created.

            // (3) Main and post loops found empty and removed.

            // (6) Pre loop is found empty, attempt to remove main and post loop then incorrectly selects main from (5).

            for (int j = 0; j < 10; ++j) {

                cnt2 = cnt1 + j;

            }

        }

    }

    public static void main(String[] strArr) {

        TestRemoveMainPostLoops test = new TestRemoveMainPostLoops();

        for (int i = 0; i < 100; i++) {

            cnt1 = 0;

            test.cnt2 = 0;

            test.test();

            if (cnt1 != 45000000 || test.cnt2 != 45000009) {

                throw new RuntimeException("Incorrect result: " + cnt1 + " " + test.cnt2);

            }

        }

    }

}