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+/** 
+ * @file llv4math.h
+ * @brief LLV4* class header file - vector processor enabled math
+ *
+ * Copyright (c) 2007-2007, 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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.
+ */
+
+#ifndef LL_LLV4MATH_H
+#define LL_LLV4MATH_H
+
+// *NOTE: We do not support SSE acceleration on Windows builds.
+// Our minimum specification for the viewer includes 1 GHz Athlon processors,
+// which covers the Athlon Thunderbird series that does not support SSE.
+//
+// Our header files include statements like this
+//   const F32 HAVOK_TIMESTEP = 1.f / 45.f;
+// This creates "globals" that are included in each .obj file.  If a single
+// .cpp file has SSE code generation turned on (eg, llviewerjointmesh_sse.cpp)
+// these globals will be initialized using SSE instructions.  This causes SL
+// to crash before main() on processors without SSE.  Untangling all these 
+// headers/variables is too much work for the small performance gains of 
+// vectorization.
+//
+// Therefore we only support vectorization on builds where the everything is 
+// built with SSE or Altivec.  See https://jira.secondlife.com/browse/VWR-1610
+// and https://jira.lindenlab.com/browse/SL-47720 for details.
+//
+// Sorry the code is such a mess. JC
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// LLV4MATH - GNUC
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+#if LL_GNUC && __GNUC__ >= 4 && __SSE__
+
+#define                 LL_VECTORIZE                                    1
+
+#if LL_DARWIN
+
+#include <Accelerate/Accelerate.h>
+#include <xmmintrin.h>
+typedef vFloat  V4F32;
+
+#else
+
+#include <xmmintrin.h>
+typedef float   V4F32                                                   __attribute__((vector_size(16)));
+
+#endif
+
+#endif
+#if LL_GNUC
+
+#define                 LL_LLV4MATH_ALIGN_PREFIX
+#define                 LL_LLV4MATH_ALIGN_POSTFIX               __attribute__((aligned(16)))
+
+#endif
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// LLV4MATH - MSVC
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+// Only vectorize if the entire Windows build uses SSE.
+// _M_IX86_FP is set when SSE code generation is turned on, and I have
+// confirmed this in VS2003, VS2003 SP1, and VS2005. JC
+#if LL_MSVC && _M_IX86_FP
+
+#define                 LL_VECTORIZE                                    1
+
+#include <xmmintrin.h>
+
+typedef __m128  V4F32;
+
+#endif
+#if LL_MSVC
+
+#define                 LL_LLV4MATH_ALIGN_PREFIX                __declspec(align(16))
+#define                 LL_LLV4MATH_ALIGN_POSTFIX
+
+#endif
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// LLV4MATH - default - no vectorization
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+#if !LL_VECTORIZE
+
+#define                 LL_VECTORIZE                                    0
+
+struct                  V4F32                                                   { F32 __pad__[4]; };
+
+inline F32 llv4lerp(F32 a, F32 b, F32 w)                { return ( b - a ) * w + a; }
+
+#endif
+
+#ifndef                 LL_LLV4MATH_ALIGN_PREFIX
+#       define                  LL_LLV4MATH_ALIGN_PREFIX
+#endif
+#ifndef                 LL_LLV4MATH_ALIGN_POSTFIX
+#       define                  LL_LLV4MATH_ALIGN_POSTFIX
+#endif
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// LLV4MATH
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+
+#define                 LLV4_NUM_AXIS                                   4
+
+class LLV4Vector3;
+class LLV4Matrix3;
+class LLV4Matrix4;
+
+#endif