Narayan Kamath | c981c48 | 2012-11-02 10:59:05 +0000 | [diff] [blame] | 1 | // This file is part of Eigen, a lightweight C++ template library |
| 2 | // for linear algebra. |
| 3 | // |
| 4 | // Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr> |
| 5 | // |
| 6 | // This Source Code Form is subject to the terms of the Mozilla |
| 7 | // Public License v. 2.0. If a copy of the MPL was not distributed |
| 8 | // with this file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| 9 | |
| 10 | #ifndef EIGEN_SELFCWISEBINARYOP_H |
| 11 | #define EIGEN_SELFCWISEBINARYOP_H |
| 12 | |
| 13 | namespace Eigen { |
| 14 | |
| 15 | /** \class SelfCwiseBinaryOp |
| 16 | * \ingroup Core_Module |
| 17 | * |
| 18 | * \internal |
| 19 | * |
| 20 | * \brief Internal helper class for optimizing operators like +=, -= |
| 21 | * |
| 22 | * This is a pseudo expression class re-implementing the copyCoeff/copyPacket |
| 23 | * method to directly performs a +=/-= operations in an optimal way. In particular, |
| 24 | * this allows to make sure that the input/output data are loaded only once using |
| 25 | * aligned packet loads. |
| 26 | * |
| 27 | * \sa class SwapWrapper for a similar trick. |
| 28 | */ |
| 29 | |
| 30 | namespace internal { |
| 31 | template<typename BinaryOp, typename Lhs, typename Rhs> |
| 32 | struct traits<SelfCwiseBinaryOp<BinaryOp,Lhs,Rhs> > |
| 33 | : traits<CwiseBinaryOp<BinaryOp,Lhs,Rhs> > |
| 34 | { |
| 35 | enum { |
| 36 | // Note that it is still a good idea to preserve the DirectAccessBit |
| 37 | // so that assign can correctly align the data. |
| 38 | Flags = traits<CwiseBinaryOp<BinaryOp,Lhs,Rhs> >::Flags | (Lhs::Flags&DirectAccessBit) | (Lhs::Flags&LvalueBit), |
| 39 | OuterStrideAtCompileTime = Lhs::OuterStrideAtCompileTime, |
| 40 | InnerStrideAtCompileTime = Lhs::InnerStrideAtCompileTime |
| 41 | }; |
| 42 | }; |
| 43 | } |
| 44 | |
| 45 | template<typename BinaryOp, typename Lhs, typename Rhs> class SelfCwiseBinaryOp |
| 46 | : public internal::dense_xpr_base< SelfCwiseBinaryOp<BinaryOp, Lhs, Rhs> >::type |
| 47 | { |
| 48 | public: |
| 49 | |
| 50 | typedef typename internal::dense_xpr_base<SelfCwiseBinaryOp>::type Base; |
| 51 | EIGEN_DENSE_PUBLIC_INTERFACE(SelfCwiseBinaryOp) |
| 52 | |
| 53 | typedef typename internal::packet_traits<Scalar>::type Packet; |
| 54 | |
| 55 | inline SelfCwiseBinaryOp(Lhs& xpr, const BinaryOp& func = BinaryOp()) : m_matrix(xpr), m_functor(func) {} |
| 56 | |
| 57 | inline Index rows() const { return m_matrix.rows(); } |
| 58 | inline Index cols() const { return m_matrix.cols(); } |
| 59 | inline Index outerStride() const { return m_matrix.outerStride(); } |
| 60 | inline Index innerStride() const { return m_matrix.innerStride(); } |
| 61 | inline const Scalar* data() const { return m_matrix.data(); } |
| 62 | |
| 63 | // note that this function is needed by assign to correctly align loads/stores |
| 64 | // TODO make Assign use .data() |
| 65 | inline Scalar& coeffRef(Index row, Index col) |
| 66 | { |
| 67 | EIGEN_STATIC_ASSERT_LVALUE(Lhs) |
| 68 | return m_matrix.const_cast_derived().coeffRef(row, col); |
| 69 | } |
| 70 | inline const Scalar& coeffRef(Index row, Index col) const |
| 71 | { |
| 72 | return m_matrix.coeffRef(row, col); |
| 73 | } |
| 74 | |
| 75 | // note that this function is needed by assign to correctly align loads/stores |
| 76 | // TODO make Assign use .data() |
| 77 | inline Scalar& coeffRef(Index index) |
| 78 | { |
| 79 | EIGEN_STATIC_ASSERT_LVALUE(Lhs) |
| 80 | return m_matrix.const_cast_derived().coeffRef(index); |
| 81 | } |
| 82 | inline const Scalar& coeffRef(Index index) const |
| 83 | { |
| 84 | return m_matrix.const_cast_derived().coeffRef(index); |
| 85 | } |
| 86 | |
| 87 | template<typename OtherDerived> |
| 88 | void copyCoeff(Index row, Index col, const DenseBase<OtherDerived>& other) |
| 89 | { |
| 90 | OtherDerived& _other = other.const_cast_derived(); |
| 91 | eigen_internal_assert(row >= 0 && row < rows() |
| 92 | && col >= 0 && col < cols()); |
| 93 | Scalar& tmp = m_matrix.coeffRef(row,col); |
| 94 | tmp = m_functor(tmp, _other.coeff(row,col)); |
| 95 | } |
| 96 | |
| 97 | template<typename OtherDerived> |
| 98 | void copyCoeff(Index index, const DenseBase<OtherDerived>& other) |
| 99 | { |
| 100 | OtherDerived& _other = other.const_cast_derived(); |
| 101 | eigen_internal_assert(index >= 0 && index < m_matrix.size()); |
| 102 | Scalar& tmp = m_matrix.coeffRef(index); |
| 103 | tmp = m_functor(tmp, _other.coeff(index)); |
| 104 | } |
| 105 | |
| 106 | template<typename OtherDerived, int StoreMode, int LoadMode> |
| 107 | void copyPacket(Index row, Index col, const DenseBase<OtherDerived>& other) |
| 108 | { |
| 109 | OtherDerived& _other = other.const_cast_derived(); |
| 110 | eigen_internal_assert(row >= 0 && row < rows() |
| 111 | && col >= 0 && col < cols()); |
| 112 | m_matrix.template writePacket<StoreMode>(row, col, |
| 113 | m_functor.packetOp(m_matrix.template packet<StoreMode>(row, col),_other.template packet<LoadMode>(row, col)) ); |
| 114 | } |
| 115 | |
| 116 | template<typename OtherDerived, int StoreMode, int LoadMode> |
| 117 | void copyPacket(Index index, const DenseBase<OtherDerived>& other) |
| 118 | { |
| 119 | OtherDerived& _other = other.const_cast_derived(); |
| 120 | eigen_internal_assert(index >= 0 && index < m_matrix.size()); |
| 121 | m_matrix.template writePacket<StoreMode>(index, |
| 122 | m_functor.packetOp(m_matrix.template packet<StoreMode>(index),_other.template packet<LoadMode>(index)) ); |
| 123 | } |
| 124 | |
| 125 | // reimplement lazyAssign to handle complex *= real |
| 126 | // see CwiseBinaryOp ctor for details |
| 127 | template<typename RhsDerived> |
| 128 | EIGEN_STRONG_INLINE SelfCwiseBinaryOp& lazyAssign(const DenseBase<RhsDerived>& rhs) |
| 129 | { |
| 130 | EIGEN_STATIC_ASSERT_SAME_MATRIX_SIZE(Lhs,RhsDerived) |
| 131 | EIGEN_CHECK_BINARY_COMPATIBILIY(BinaryOp,typename Lhs::Scalar,typename RhsDerived::Scalar); |
| 132 | |
| 133 | #ifdef EIGEN_DEBUG_ASSIGN |
| 134 | internal::assign_traits<SelfCwiseBinaryOp, RhsDerived>::debug(); |
| 135 | #endif |
| 136 | eigen_assert(rows() == rhs.rows() && cols() == rhs.cols()); |
| 137 | internal::assign_impl<SelfCwiseBinaryOp, RhsDerived>::run(*this,rhs.derived()); |
| 138 | #ifndef EIGEN_NO_DEBUG |
| 139 | this->checkTransposeAliasing(rhs.derived()); |
| 140 | #endif |
| 141 | return *this; |
| 142 | } |
| 143 | |
| 144 | // overloaded to honor evaluation of special matrices |
| 145 | // maybe another solution would be to not use SelfCwiseBinaryOp |
| 146 | // at first... |
| 147 | SelfCwiseBinaryOp& operator=(const Rhs& _rhs) |
| 148 | { |
| 149 | typename internal::nested<Rhs>::type rhs(_rhs); |
| 150 | return Base::operator=(rhs); |
| 151 | } |
| 152 | |
| 153 | Lhs& expression() const |
| 154 | { |
| 155 | return m_matrix; |
| 156 | } |
| 157 | |
| 158 | const BinaryOp& functor() const |
| 159 | { |
| 160 | return m_functor; |
| 161 | } |
| 162 | |
| 163 | protected: |
| 164 | Lhs& m_matrix; |
| 165 | const BinaryOp& m_functor; |
| 166 | |
| 167 | private: |
| 168 | SelfCwiseBinaryOp& operator=(const SelfCwiseBinaryOp&); |
| 169 | }; |
| 170 | |
| 171 | template<typename Derived> |
| 172 | inline Derived& DenseBase<Derived>::operator*=(const Scalar& other) |
| 173 | { |
| 174 | typedef typename Derived::PlainObject PlainObject; |
| 175 | SelfCwiseBinaryOp<internal::scalar_product_op<Scalar>, Derived, typename PlainObject::ConstantReturnType> tmp(derived()); |
| 176 | tmp = PlainObject::Constant(rows(),cols(),other); |
| 177 | return derived(); |
| 178 | } |
| 179 | |
| 180 | template<typename Derived> |
| 181 | inline Derived& DenseBase<Derived>::operator/=(const Scalar& other) |
| 182 | { |
| 183 | typedef typename internal::conditional<NumTraits<Scalar>::IsInteger, |
| 184 | internal::scalar_quotient_op<Scalar>, |
| 185 | internal::scalar_product_op<Scalar> >::type BinOp; |
| 186 | typedef typename Derived::PlainObject PlainObject; |
| 187 | SelfCwiseBinaryOp<BinOp, Derived, typename PlainObject::ConstantReturnType> tmp(derived()); |
Carlos Hernandez | 7faaa9f | 2014-08-05 17:53:32 -0700 | [diff] [blame] | 188 | Scalar actual_other; |
| 189 | if(NumTraits<Scalar>::IsInteger) actual_other = other; |
| 190 | else actual_other = Scalar(1)/other; |
| 191 | tmp = PlainObject::Constant(rows(),cols(), actual_other); |
Narayan Kamath | c981c48 | 2012-11-02 10:59:05 +0000 | [diff] [blame] | 192 | return derived(); |
| 193 | } |
| 194 | |
| 195 | } // end namespace Eigen |
| 196 | |
| 197 | #endif // EIGEN_SELFCWISEBINARYOP_H |