1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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13  * accompanied this code).
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23 
24 /**
25  * @test
26  * @bug 8231550
27  * @summary C2: ShouldNotReachHere() in verify_strip_mined_scheduling
28  *
29  * @run main/othervm -XX:-BackgroundCompilation -XX:LoopMaxUnroll=0 TestConservativeAntiDep
30  *
31  */
32 
33 import java.lang.reflect.Array;
34 import java.util.Arrays;
35 
36 public class TestConservativeAntiDep {
37     private static long longField;
38 
main(String[] args)39     public static void main(String[] args) throws InstantiationException, IllegalAccessException {
40         for (int i = 0; i < 20_000; i++) {
41             test1(A.class);
42             test2(B.class);
43         }
44     }
45 
test1(Class klass)46     private static int test1(Class klass) {
47         Object[] in = (Object[])Array.newInstance(klass, 100);
48 
49         Object[] o = in;
50         int v = 1;
51         // CountedLoop has control dependent CastPP
52         for (int i = 0; i < 100 ; i++) {
53             longField = i; // sunk in outer strip mined loop
54             o = (A[]) o;
55             v *= 2;
56         }
57 
58         // LoadRange cannot float higher than CountedLoop (because of
59         // CastPP) and is found anti-dependent with long store so
60         // scheduled in outer strip mined loop
61         return v + o.length;
62     }
63 
test2(Class klass)64     private static int test2(Class klass) throws IllegalAccessException, InstantiationException {
65         A in = (A)klass.newInstance();
66 
67         A o = in;
68         int v = 1;
69         // CountedLoop has control dependent CastPP
70         for (int i = 0; i < 100 ; i++) {
71             longField = i;  // sunk in outer strip mined loop
72             o = (B) o;
73             v *= 2;
74         }
75 
76         // Load cannot float higher than CountedLoop (because of
77         // CastPP) and is found anti-dependent with long store so
78         // scheduled in outer strip mined loop
79         return v + o.intField;
80     }
81 
82     private static class A {
83         int intField;
A()84         public A() {}
85     }
86 
87     private static class B extends A {
B()88         public B() {}
89     }
90 }
91