Eigne Matrix Class Library
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ForceAlignedAccess.h
00001 // This file is part of Eigen, a lightweight C++ template library 00002 // for linear algebra. 00003 // 00004 // Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr> 00005 // 00006 // This Source Code Form is subject to the terms of the Mozilla 00007 // Public License v. 2.0. If a copy of the MPL was not distributed 00008 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/. 00009 00010 #ifndef EIGEN_FORCEALIGNEDACCESS_H 00011 #define EIGEN_FORCEALIGNEDACCESS_H 00012 00013 namespace Eigen { 00014 00015 /** \class ForceAlignedAccess 00016 * \ingroup Core_Module 00017 * 00018 * \brief Enforce aligned packet loads and stores regardless of what is requested 00019 * 00020 * \param ExpressionType the type of the object of which we are forcing aligned packet access 00021 * 00022 * This class is the return type of MatrixBase::forceAlignedAccess() 00023 * and most of the time this is the only way it is used. 00024 * 00025 * \sa MatrixBase::forceAlignedAccess() 00026 */ 00027 00028 namespace internal { 00029 template<typename ExpressionType> 00030 struct traits<ForceAlignedAccess<ExpressionType> > : public traits<ExpressionType> 00031 {}; 00032 } 00033 00034 template<typename ExpressionType> class ForceAlignedAccess 00035 : public internal::dense_xpr_base< ForceAlignedAccess<ExpressionType> >::type 00036 { 00037 public: 00038 00039 typedef typename internal::dense_xpr_base<ForceAlignedAccess>::type Base; 00040 EIGEN_DENSE_PUBLIC_INTERFACE(ForceAlignedAccess) 00041 00042 inline ForceAlignedAccess(const ExpressionType& matrix) : m_expression(matrix) {} 00043 00044 inline Index rows() const { return m_expression.rows(); } 00045 inline Index cols() const { return m_expression.cols(); } 00046 inline Index outerStride() const { return m_expression.outerStride(); } 00047 inline Index innerStride() const { return m_expression.innerStride(); } 00048 00049 inline const CoeffReturnType coeff(Index row, Index col) const 00050 { 00051 return m_expression.coeff(row, col); 00052 } 00053 00054 inline Scalar& coeffRef(Index row, Index col) 00055 { 00056 return m_expression.const_cast_derived().coeffRef(row, col); 00057 } 00058 00059 inline const CoeffReturnType coeff(Index index) const 00060 { 00061 return m_expression.coeff(index); 00062 } 00063 00064 inline Scalar& coeffRef(Index index) 00065 { 00066 return m_expression.const_cast_derived().coeffRef(index); 00067 } 00068 00069 template<int LoadMode> 00070 inline const PacketScalar packet(Index row, Index col) const 00071 { 00072 return m_expression.template packet<Aligned>(row, col); 00073 } 00074 00075 template<int LoadMode> 00076 inline void writePacket(Index row, Index col, const PacketScalar& x) 00077 { 00078 m_expression.const_cast_derived().template writePacket<Aligned>(row, col, x); 00079 } 00080 00081 template<int LoadMode> 00082 inline const PacketScalar packet(Index index) const 00083 { 00084 return m_expression.template packet<Aligned>(index); 00085 } 00086 00087 template<int LoadMode> 00088 inline void writePacket(Index index, const PacketScalar& x) 00089 { 00090 m_expression.const_cast_derived().template writePacket<Aligned>(index, x); 00091 } 00092 00093 operator const ExpressionType&() const { return m_expression; } 00094 00095 protected: 00096 const ExpressionType& m_expression; 00097 00098 private: 00099 ForceAlignedAccess& operator=(const ForceAlignedAccess&); 00100 }; 00101 00102 /** \returns an expression of *this with forced aligned access 00103 * \sa forceAlignedAccessIf(),class ForceAlignedAccess 00104 */ 00105 template<typename Derived> 00106 inline const ForceAlignedAccess<Derived> 00107 MatrixBase<Derived>::forceAlignedAccess () const 00108 { 00109 return ForceAlignedAccess<Derived>(derived()); 00110 } 00111 00112 /** \returns an expression of *this with forced aligned access 00113 * \sa forceAlignedAccessIf(), class ForceAlignedAccess 00114 */ 00115 template<typename Derived> 00116 inline ForceAlignedAccess<Derived> 00117 MatrixBase<Derived>::forceAlignedAccess () 00118 { 00119 return ForceAlignedAccess<Derived>(derived()); 00120 } 00121 00122 /** \returns an expression of *this with forced aligned access if \a Enable is true. 00123 * \sa forceAlignedAccess(), class ForceAlignedAccess 00124 */ 00125 template<typename Derived> 00126 template<bool Enable> 00127 inline typename internal::add_const_on_value_type<typename internal::conditional<Enable,ForceAlignedAccess<Derived>,Derived&>::type>::type 00128 MatrixBase<Derived>::forceAlignedAccessIf () const 00129 { 00130 return derived(); 00131 } 00132 00133 /** \returns an expression of *this with forced aligned access if \a Enable is true. 00134 * \sa forceAlignedAccess(), class ForceAlignedAccess 00135 */ 00136 template<typename Derived> 00137 template<bool Enable> 00138 inline typename internal::conditional<Enable,ForceAlignedAccess<Derived>,Derived&>::type 00139 MatrixBase<Derived>::forceAlignedAccessIf () 00140 { 00141 return derived(); 00142 } 00143 00144 } // end namespace Eigen 00145 00146 #endif // EIGEN_FORCEALIGNEDACCESS_H
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