diff -r e606853325f1 -r 2d537f8cd604 emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js
--- a/emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js	Thu Jan 31 20:37:12 2013 +0100
+++ b/emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js	Fri Feb 01 06:09:18 2013 +0100
@@ -121,10 +121,10 @@
 
 Number.prototype.shl64 = function(x) {
     if (x >= 32) {
-        var hi = (this << (x - 32)) | 0;
+        var hi = this << (x - 32);
         return hi.next32(0);
     } else {
-        var hi = (this.high32() << x) | 0;
+        var hi = this.high32() << x;
         var low_reminder = this >> (32 - x);
         hi |= low_reminder;
         var low = this << x;
@@ -135,11 +135,11 @@
 
 Number.prototype.shr64 = function(x) {
     if (x >= 32) {
-        var low = (this.high32() >> (x - 32)) | 0;
+        var low = this.high32() >> (x - 32);
         low += (low < 0) ? (__m32+1) : 0;
         return low;
     } else {
-        var low = (this >> x) | 0;
+        var low = this >> x;
         var hi_reminder = this.high32() << (32 - x);
         low |= hi_reminder;
         low += (low < 0) ? (__m32+1) : 0;
@@ -148,6 +148,21 @@
     }
 };
 
+Number.prototype.ushr64 = function(x) {
+    if (x >= 32) {
+        var low = this.high32() >>> (x - 32);
+        low += (low < 0) ? (__m32+1) : 0;
+        return low;
+    } else {
+        var low = this >>> x;
+        var hi_reminder = this.high32() << (32 - x);
+        low |= hi_reminder;
+        low += (low < 0) ? (__m32+1) : 0;
+        var hi = this.high32() >>> x;
+        return hi.next32(low);
+    }
+};
+
 Number.prototype.compare64 = function(x) {
     if (this.hi == x.hi) {
         return (this == x) ? 0 : ((this < x) ? -1 : 1);