diff -r 9cbf1f2ad7ee -r 960e219425e2 vm/src/test/java/org/apidesign/vm4brwsr/Numbers.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/Numbers.java	Thu Jan 31 13:42:14 2013 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/Numbers.java	Thu Jan 31 13:55:12 2013 +0100
@@ -95,4 +95,16 @@
     public static long modL(long x, long y) {
         return (x % y);
     }
+    
+    public static long shlL(byte[] arrValue, int nBits) throws IOException {
+        ByteArrayInputStream isValue = new ByteArrayInputStream(arrValue);
+        DataInputStream disValue = new DataInputStream(isValue);
+        return (disValue.readLong() << nBits);
+    }
+    
+    public static long shrL(byte[] arrValue, int nBits) throws IOException {
+        ByteArrayInputStream isValue = new ByteArrayInputStream(arrValue);
+        DataInputStream disValue = new DataInputStream(isValue);
+        return (disValue.readLong() >> nBits);
+    }
 }