llv4math.h
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- /**
- * @file llv4math.h
- * @brief LLV4* class header file - vector processor enabled math
- *
- * $LicenseInfo:firstyear=2007&license=viewergpl$
- *
- * Copyright (c) 2007-2010, 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.
- * $/LicenseInfo$
- */
- #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