diff -r 4c2b92281cdc -r e606853325f1 vm/src/test/java/org/apidesign/vm4brwsr/NumberTest.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/NumberTest.java	Thu Jan 31 20:19:38 2013 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/NumberTest.java	Thu Jan 31 20:37:12 2013 +0100
@@ -275,6 +275,36 @@
         );
     }
     
+    @Test public void longXor1() throws Exception {
+        final long res = 0x00fa37d7763e0ca1l ^ 0xa7b3432fff00123el;
+        assertExec("Long binary XOR",
+            Numbers.class, "xorL__J_3B_3B", 
+            Double.valueOf(res),
+            new byte[] { (byte)0x00, (byte)0xfa, (byte)0x37, (byte)0xd7, (byte)0x76, (byte)0x3e, (byte)0x0c, (byte)0xa1 },
+            new byte[] { (byte)0xa7, (byte)0xb3, (byte)0x43, (byte)0x2f, (byte)0xff, (byte)0x00, (byte)0x12, (byte)0x3e }
+        );
+    }
+    
+    @Test public void longXor2() throws Exception {
+        final long res = 0x00fa37d7763e0ca1l ^ 0x00000000ff00123el;
+        assertExec("Long binary XOR",
+            Numbers.class, "xorL__J_3B_3B", 
+            Double.valueOf(res),
+            new byte[] { (byte)0x00, (byte)0xfa, (byte)0x37, (byte)0xd7, (byte)0x76, (byte)0x3e, (byte)0x0c, (byte)0xa1 },
+            new byte[] { (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0xff, (byte)0x00, (byte)0x12, (byte)0x3e }
+        );
+    }
+    
+    @Test public void longXor3() throws Exception {
+        final long res = 0x00000000763e0ca1l ^ 0x00000000ff00123el;
+        assertExec("Long binary XOR",
+            Numbers.class, "xorL__J_3B_3B", 
+            Double.valueOf(res),
+            new byte[] { (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x76, (byte)0x3e, (byte)0x0c, (byte)0xa1 },
+            new byte[] { (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0xff, (byte)0x00, (byte)0x12, (byte)0x3e }
+        );
+    }
+    
     private static CharSequence codeSeq;
     private static Invocable code;