diff -r 11d3145097dc -r 7bc78045adfd rt/emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js
--- a/rt/emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js	Tue Apr 02 12:46:03 2013 +0200
+++ b/rt/emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js	Wed Oct 09 14:50:29 2013 +0200
@@ -176,6 +176,8 @@
     };
 
     numberPrototype.shl64 = function(x) {
+        x &= 0x3f;
+        if (x == 0) return this;
         if (x >= 32) {
             var hi = this << (x - 32);
             return hi.next32(0);
@@ -190,6 +192,8 @@
     };
 
     numberPrototype.shr64 = function(x) {
+        x &= 0x3f;
+        if (x == 0) return this;
         if (x >= 32) {
             var low = this.high32() >> (x - 32);
             low += (low < 0) ? (__m32 + 1) : 0;
@@ -205,6 +209,8 @@
     };
 
     numberPrototype.ushr64 = function(x) {
+        x &= 0x3f;
+        if (x == 0) return this;
         if (x >= 32) {
             var low = this.high32() >>> (x - 32);
             low += (low < 0) ? (__m32 + 1) : 0;