I take a little time to create a simple test case to reproduce a bug
found by Charles Nutter with c2.
see http://groups.google.com/group/jvm-languages/browse_thread/thread/6c9e05ecd28fdcd4#

Here is the test case,
There is 3 classes A, B, C that inherit from AbstractFoo that implements Foo.
The method test do a virtual call to check() and because
check() is implemented in AbstractFoo we expect that this call should be
de-virtualized then inlined.

c2 fails, foo.check() is compiled as a virtual call :(
With c1, there is no problem, CHA works correctly.

Rémi

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public class InlineTest {
 interface Foo {
   public boolean check(int generation);
 }

 static class AbstractFoo implements Foo {
   private final int value;

   protected AbstractFoo(int value) {
     this.value = value;
   }

   public boolean check(int generation) {
     return this.getClass().hashCode() - value == generation;
   }
 }

 static class A extends AbstractFoo {
   public A(int value) {
     super(value);
   }
 }
 static class B extends AbstractFoo {
   public B(int value) {
     super(value);
   }
 }
 static class C extends AbstractFoo {
   public C(int value) {
     super(value);
   }
 }

 private static final int CONST = A.class.hashCode();

 private static int count;

 private static void test(Foo foo) {
   if (foo.check(0)) {
       count += 2;
       //System.out.println("foo");
   } else {
       count += 1;
       //System.out.println("bar");
   }
 }

 public static void main(String[] args) {
   Foo[] array = new Foo[100000];
   int threshold = 20000;
   for(int i=0; i<threshold; i++) {
     array[i] = new A(CONST);
   }

   for(int i=threshold; i<array.length; i++) {
     array[i] = (i%2 == 0)? new B(0): new C(CONST);
   }

   for(int i=0; i<array.length; i++) {
     test(array[i]);
   }

   System.out.println(count);
 }
}