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test/hotspot/jtreg/compiler/c2/irTests/TestOptimizeUnstableIf.java

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25 
26 import jdk.test.lib.Asserts;
27 import compiler.lib.ir_framework.*;
28 
29 /*
30  * @test
31  * @bug 8286104
32  * @summary Test that C2 uses aggressive liveness to get rid of the boxing object which is
33  *  only consumed by uncommon_trap.
34  * @library /test/lib /
35  * @run driver compiler.c2.irTests.TestOptimizeUnstableIf
36  */
37 public class TestOptimizeUnstableIf {
38 
39     public static void main(String[] args) {
40         TestFramework.run();
41     }
42 
43     @Test
44     @Arguments(values = {Argument.MAX}) // the argument needs to be big enough to fall out of cache.
45     @IR(failOn = {IRNode.ALLOC_OF, "Integer"})

46     public static int boxing_object(int value) {
47         Integer ii = Integer.valueOf(value);
48         int sum = 0;
49 
50         if (value > 999_999) {
51             sum += ii.intValue();
52         }
53 
54         return sum;
55     }
56 
57     @Check(test = "boxing_object")
58     public void checkWithTestInfo(int result, TestInfo info) {
59         if (info.isWarmUp()) {
60             // Accessing the cached boxing object during warm-up phase. It prevents parser from pruning that branch of Interger.valueOf();
61             // This guarantees that a phi node is generated, which merge a cached object and the newly allocated object. eg.
62             // 112:  Phi  ===  108  168  188  [[ 50 ]]  #java/lang/Integer:NotNull:exact *  Oop:java/lang/Integer:NotNull:exact *
63             // 168: a cached object
64             // 188: result of AllocateNode
65             //  50: uncommon_trap unstable_if

25 
26 import jdk.test.lib.Asserts;
27 import compiler.lib.ir_framework.*;
28 
29 /*
30  * @test
31  * @bug 8286104
32  * @summary Test that C2 uses aggressive liveness to get rid of the boxing object which is
33  *  only consumed by uncommon_trap.
34  * @library /test/lib /
35  * @run driver compiler.c2.irTests.TestOptimizeUnstableIf
36  */
37 public class TestOptimizeUnstableIf {
38 
39     public static void main(String[] args) {
40         TestFramework.run();
41     }
42 
43     @Test
44     @Arguments(values = {Argument.MAX}) // the argument needs to be big enough to fall out of cache.
45     // TODO 8328675 Re-enable
46     // @IR(failOn = {IRNode.ALLOC_OF, "Integer"})
47     public static int boxing_object(int value) {
48         Integer ii = Integer.valueOf(value);
49         int sum = 0;
50 
51         if (value > 999_999) {
52             sum += ii.intValue();
53         }
54 
55         return sum;
56     }
57 
58     @Check(test = "boxing_object")
59     public void checkWithTestInfo(int result, TestInfo info) {
60         if (info.isWarmUp()) {
61             // Accessing the cached boxing object during warm-up phase. It prevents parser from pruning that branch of Interger.valueOf();
62             // This guarantees that a phi node is generated, which merge a cached object and the newly allocated object. eg.
63             // 112:  Phi  ===  108  168  188  [[ 50 ]]  #java/lang/Integer:NotNull:exact *  Oop:java/lang/Integer:NotNull:exact *
64             // 168: a cached object
65             // 188: result of AllocateNode
66             //  50: uncommon_trap unstable_if
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