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23 
24 package compiler.loopopts;
25 
26 import java.lang.reflect.Method;
27 import sun.hotspot.WhiteBox;
28 import jdk.test.lib.Asserts;
29 import compiler.whitebox.CompilerWhiteBoxTest;
30 
31 public class UseCountedLoopSafepoints {
32     private static final WhiteBox WB = WhiteBox.getWhiteBox();
33     private static final String METHOD_NAME = "testMethod";
34 
35     private long accum = 0;
36 
main(String args[])37     public static void main (String args[]) throws Exception {
38         new UseCountedLoopSafepoints().testMethod();
39         Method m = UseCountedLoopSafepoints.class.getDeclaredMethod(METHOD_NAME);
40         String directive = "[{ match: \"" + UseCountedLoopSafepoints.class.getName().replace('.', '/')
41                 + "." + METHOD_NAME + "\", " + "BackgroundCompilation: false }]";
42         Asserts.assertTrue(WB.addCompilerDirective(directive) == 1, "Can't add compiler directive");
43         Asserts.assertTrue(WB.enqueueMethodForCompilation(m,
44                 CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION), "Can't enqueue method");
45     }
46 
testMethod()47     private void testMethod() {
48         for (int i = 0; i < 100; i++) {
49             accum += accum << 5 + accum >> 4 - accum >>> 5;
50         }
51     }
52 }
53