A DESCRIPTION OF THE PROBLEM :
When I executed the following code using three different versions of jdk, I found obvious time differences. Analyzing the code, I believe that the JIT's handling of the performIntensiveCalculations() method's call to complexCalculation() is the cause of the performance difference.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
time /root/jvm_debug/openjdk/hotspot-jdk8u352/build/linux-x86_64-normal-server-fastdebug/jdk/bin/java B
6525276770152
216070688

real 0m1.240s
user 0m0.591s
sys 0m0.616s

time /root/jvm_debug/openjdk/hotspot-jdk-21.0.2/build/linux-x86_64-server-fastdebug/jdk/bin/java B
6525276770152
457029457

real 0m2.640s
user 0m9.747s
sys 0m0.194s
ACTUAL -
/root/jvm_debug/openjdk/hotspot-jdk-11.0.15/build/linux-x86_64-normal-server-fastdebug/jdk/bin/java B
6525276770152
314471934

real 0m19.329s
user 2m20.893s
sys 0m0.686s

---------- BEGIN SOURCE ----------
public class B {
    public static void main(String[] args) {
        long startTime = System.nanoTime();

        long result = performIntensiveCalculations();

        long endTime = System.nanoTime();
        System.out.println("" + result);
        System.out.println("" + (endTime - startTime) + " ");
    }

    private static long performIntensiveCalculations() {
        long sum = 0;
        for (int i = 1; i <= 100000000; i++) {
            sum += complexCalculation(i);
        }
        return sum;
    }

    private static int complexCalculation(int x) {
        int y = x * 33;
        y = y ^ (y << 10);
        y += y >> 3;
        y ^= (y << 4);
        y *= 7;
        y = y ^ (y << 9);
        y += y >> 2;
        y ^= (y << 5);
        y *= 3;
        return y;
    }
}
---------- END SOURCE ----------