85         // before the first field write.
 86         TestFramework.runWithFlags("-XX:+UseG1GC");
 87     }
 88 
 89     @Run(test = "testScalarReplacementWithGCBarrier")
 90     private void runner() {
 91         List list = new List();
 92         for (int i = 0; i < SIZE; i++) {
 93             list.push(i);
 94         }
 95         testScalarReplacementWithGCBarrier(list);
 96     }
 97 
 98     // Allocation of `Iter iter` should be eliminated by scalar replacement, and
 99     // the allocation of `Integer sum` can not be eliminated, so there should be
100     // 1 allocation after allocations and locks elimination.
101     //
102     // Before the patch of JDK-8333334, both allocations of `Iter` and `Integer`
103     // could not be eliminated.
104     @Test
105     @IR(phase = { CompilePhase.AFTER_PARSING }, counts = { IRNode.ALLOC, "1" })
106     @IR(phase = { CompilePhase.INCREMENTAL_BOXING_INLINE }, counts = { IRNode.ALLOC, "2" })
107     @IR(phase = { CompilePhase.ITER_GVN_AFTER_ELIMINATION }, counts = { IRNode.ALLOC, "1" })
108     private int testScalarReplacementWithGCBarrier(List list) {
109         Iter iter = list.iter();
110         while (true) {
111             while (iter.next()) {}
112             if (list.head == null) break;
113             list.head = list.head.next;
114             iter.n = list.head;
115         }
116         return iter.sum;
117     }
118 }

 85         // before the first field write.
 86         TestFramework.runWithFlags("-XX:+UseG1GC");
 87     }
 88 
 89     @Run(test = "testScalarReplacementWithGCBarrier")
 90     private void runner() {
 91         List list = new List();
 92         for (int i = 0; i < SIZE; i++) {
 93             list.push(i);
 94         }
 95         testScalarReplacementWithGCBarrier(list);
 96     }
 97 
 98     // Allocation of `Iter iter` should be eliminated by scalar replacement, and
 99     // the allocation of `Integer sum` can not be eliminated, so there should be
100     // 1 allocation after allocations and locks elimination.
101     //
102     // Before the patch of JDK-8333334, both allocations of `Iter` and `Integer`
103     // could not be eliminated.
104     @Test
105     @IR(phase = { CompilePhase.PHASEIDEAL_BEFORE_EA }, counts = { IRNode.ALLOC, "2" })

106     @IR(phase = { CompilePhase.ITER_GVN_AFTER_ELIMINATION }, counts = { IRNode.ALLOC, "1" })
107     private int testScalarReplacementWithGCBarrier(List list) {
108         Iter iter = list.iter();
109         while (true) {
110             while (iter.next()) {}
111             if (list.head == null) break;
112             list.head = list.head.next;
113             iter.n = list.head;
114         }
115         return iter.sum;
116     }
117 }