test/micro/org/openjdk/bench/vm/lang/LockUnlock.java

rev 53382 : 8217368: AArch64: C2 recursive stack locking optimisation not triggered
Reviewed-by: duke

*** 108,117 ****
--- 108,129 ----
      @Benchmark
      public void testRecursiveSynchronization() {
          factorial = fact(10);
      }
  
+     /**
+      * Same as {@link #testRecursiveSynchronization()} but the first call
+      * to this method will generate the identity hashcode for this object
+      * which effectively disables biased locking as they occupy the same
+      * bits in the object header.
+      */
+     @Benchmark
+     public void testRecursiveSynchronizationNoBias() {
+         System.identityHashCode(this);
+         factorial = fact(10);
+     }
+ 
      private synchronized int fact(int n) {
          if (n == 0) {
              return 1;
          } else {
              return fact(n - 1) * n;