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diff --git a/indra/llmath/llvector4logical.h b/indra/llmath/llvector4logical.h
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+/** 
+ * @file llvector4logical.h
+ * @brief LLVector4Logical class header file - Companion class to LLVector4a for logical and bit-twiddling operations
+ *
+ * $LicenseInfo:firstyear=2010&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef	LL_VECTOR4LOGICAL_H
+#define	LL_VECTOR4LOGICAL_H
+
+
+////////////////////////////
+// LLVector4Logical
+////////////////////////////
+// This class is incomplete. If you need additional functionality,
+// for example setting/unsetting particular elements or performing
+// other boolean operations, feel free to implement. If you need
+// assistance in determining the most optimal implementation,
+// contact someone with SSE experience (Falcon, Richard, Davep, e.g.)
+////////////////////////////
+
+static LL_ALIGN_16(const U32 S_V4LOGICAL_MASK_TABLE[4*4]) =
+{
+	0xFFFFFFFF, 0x00000000, 0x00000000, 0x00000000,
+	0x00000000, 0xFFFFFFFF, 0x00000000, 0x00000000,
+	0x00000000, 0x00000000, 0xFFFFFFFF, 0x00000000,
+	0x00000000, 0x00000000, 0x00000000, 0xFFFFFFFF
+};
+
+class LLVector4Logical
+{
+public:
+	
+	enum {
+		MASK_X = 1,
+		MASK_Y = 1 << 1,
+		MASK_Z = 1 << 2,
+		MASK_W = 1 << 3,
+		MASK_XYZ = MASK_X | MASK_Y | MASK_Z,
+		MASK_XYZW = MASK_XYZ | MASK_W
+	};
+	
+	// Empty default ctor
+	LLVector4Logical() {}
+	
+	LLVector4Logical( const LLQuad& quad )
+	{
+		mQ = quad;
+	}
+	
+	// Create and return a mask consisting of the lowest order bit of each element
+	inline U32 getGatheredBits() const
+	{
+		return _mm_movemask_ps(mQ);
+	};	
+	
+	// Invert this mask
+	inline LLVector4Logical& invert()
+	{
+		static const LL_ALIGN_16(U32 allOnes[4]) = { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
+		mQ = _mm_andnot_ps( mQ, *(LLQuad*)(allOnes) );
+		return *this;
+	}
+	
+	inline LLBool32 areAllSet( U32 mask ) const
+	{
+		return ( getGatheredBits() & mask) == mask;
+	}
+	
+	inline LLBool32 areAllSet() const
+	{
+		return areAllSet( MASK_XYZW );
+	}
+		
+	inline LLBool32 areAnySet( U32 mask ) const
+	{
+		return getGatheredBits() & mask;
+	}
+	
+	inline LLBool32 areAnySet() const
+	{
+		return areAnySet( MASK_XYZW );
+	}
+	
+	inline operator LLQuad() const
+	{
+		return mQ;
+	}
+
+	inline void clear() 
+	{
+		mQ = _mm_setzero_ps();
+	}
+
+	template<int N> void setElement()
+	{
+		mQ = _mm_or_ps( mQ, *reinterpret_cast<const LLQuad*>(S_V4LOGICAL_MASK_TABLE + 4*N) );
+	}
+	
+private:
+	
+	LLQuad mQ;
+};
+
+#endif //LL_VECTOR4ALOGICAL_H