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
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
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  23 
  24 /**
  25  * @test
  26  * @bug 6805724
  27  * @summary ModLNode::Ideal() generates functionally incorrect graph
  28  *          when divisor is any (2^k-1) constant.
  29  * @modules java.base/jdk.internal.misc
  30  * @library /test/lib
  31  *
  32  * @run main/othervm -Xcomp
  33  *      -XX:CompileCommand=compileonly,compiler.c2.Test6805724::fcomp
  34  *      compiler.c2.Test6805724
  35  */
  36 
  37 package compiler.c2;
  38 
  39 import jdk.test.lib.Utils;
  40 
  41 public class Test6805724 implements Runnable {
  42     // Initialize DIVISOR so that it is final in this class.
  43     static final long DIVISOR;  // 2^k-1 constant
  44 
  45     static {
  46         long value = 0;
  47         try {
  48             value = Long.decode(System.getProperty("divisor"));
  49         } catch (Throwable t) {
  50             // This one is required for the Class.forName() in main.
  51         }
  52         DIVISOR = value;
  53     }
  54 
  55     static long fint(long x) {
  56         return x % DIVISOR;
  57     }
  58 
  59     static long fcomp(long x) {
  60         return x % DIVISOR;
  61     }
  62 
  63     public void run() {
  64         long a = 0x617981E1L;
  65 
  66         long expected = fint(a);
  67         long result = fcomp(a);
  68 
  69         if (result != expected)
  70             throw new InternalError(result + " != " + expected);
  71     }
  72 
  73     public static void main(String args[]) throws Exception {
  74         Class cl = Test6805724.class;
  75         ClassLoader apploader = cl.getClassLoader();
  76 
  77         // Iterate over all 2^k-1 divisors.
  78         for (int k = 1; k < Long.SIZE; k++) {
  79             long divisor = (1L << k) - 1;
  80             System.setProperty("divisor", "" + divisor);
  81             ClassLoader loader
  82                     = Utils.getTestClassPathURLClassLoader(apploader.getParent());
  83             Class c = loader.loadClass(Test6805724.class.getName());
  84             Runnable r = (Runnable) c.newInstance();
  85             r.run();
  86         }
  87     }
  88 }