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diff --git a/linden/indra/test/llmodularmath_tut.cpp b/linden/indra/test/llmodularmath_tut.cpp
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+/**
+ * @file modularmath_tut.cpp
+ * @author babbage
+ * @date 2008-09
+ * @brief llcircuit tests
+ *
+ * $LicenseInfo:firstyear=2007&license=viewergpl$
+ * 
+ * Copyright (c) 2007-2008, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+ 
+#include <tut/tut.h>
+#include "linden_common.h"
+#include "lltut.h"
+#include "llmodularmath.h"
+
+namespace tut
+{
+        struct modularmath_data
+        {
+        };
+        typedef test_group<modularmath_data> modularmath_test;
+        typedef modularmath_test::object modularmath_object;
+        tut::modularmath_test modularmath_testcase("modularmath");
+
+        template<> template<>
+        void modularmath_object::test<1>()
+        {
+                // lhs < rhs
+                const U32 lhs = 0x000001;
+                const U32 rhs = 0xFFFFFF;
+                const U32 width = 24;
+                U32 result = LLModularMath::subtract<width>(lhs, rhs); 
+                ensure_equals("diff(0x000001, 0xFFFFFF, 24)", result, 2);
+        }
+
+        template<> template<>
+        void modularmath_object::test<2>()
+        {
+                // lhs > rhs
+                const U32 lhs = 0x000002;
+                const U32 rhs = 0x000001;
+                const U32 width = 24;
+                U32 result = LLModularMath::subtract<width>(lhs, rhs); 
+                ensure_equals("diff(0x000002, 0x000001, 24)", result, 1);
+        }
+
+        template<> template<>
+        void modularmath_object::test<3>()
+        {
+                // lhs == rhs
+                const U32 lhs = 0xABCDEF;
+                const U32 rhs = 0xABCDEF;
+                const U32 width = 24;
+                U32 result = LLModularMath::subtract<width>(lhs, rhs); 
+                ensure_equals("diff(0xABCDEF, 0xABCDEF, 24)", result, 0);
+        }       
+}