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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2008-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef EIGEN_ASSIGNMENT_FUNCTORS_H
#define EIGEN_ASSIGNMENT_FUNCTORS_H
namespace Eigen {
namespace internal {
/** \internal
* \brief Template functor for scalar/packet assignment
*
*/
template<typename DstScalar,typename SrcScalar> struct assign_op {
EIGEN_EMPTY_STRUCT_CTOR(assign_op)
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void assignCoeff(DstScalar& a, const SrcScalar& b) const { a = b; }
template<int Alignment, typename Packet>
EIGEN_STRONG_INLINE void assignPacket(DstScalar* a, const Packet& b) const
{ internal::pstoret<DstScalar,Packet,Alignment>(a,b); }
};
// Empty overload for void type (used by PermutationMatrix)
template<typename DstScalar> struct assign_op<DstScalar,void> {};
template<typename DstScalar,typename SrcScalar>
struct functor_traits<assign_op<DstScalar,SrcScalar> > {
enum {
Cost = NumTraits<DstScalar>::ReadCost,
PacketAccess = is_same<DstScalar,SrcScalar>::value && packet_traits<DstScalar>::Vectorizable && packet_traits<SrcScalar>::Vectorizable
};
};
/** \internal
* \brief Template functor for scalar/packet assignment with addition
*
*/
template<typename DstScalar,typename SrcScalar> struct add_assign_op {
EIGEN_EMPTY_STRUCT_CTOR(add_assign_op)
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void assignCoeff(DstScalar& a, const SrcScalar& b) const { a += b; }
template<int Alignment, typename Packet>
EIGEN_STRONG_INLINE void assignPacket(DstScalar* a, const Packet& b) const
{ internal::pstoret<DstScalar,Packet,Alignment>(a,internal::padd(internal::ploadt<Packet,Alignment>(a),b)); }
};
template<typename DstScalar,typename SrcScalar>
struct functor_traits<add_assign_op<DstScalar,SrcScalar> > {
enum {
Cost = NumTraits<DstScalar>::ReadCost + NumTraits<DstScalar>::AddCost,
PacketAccess = is_same<DstScalar,SrcScalar>::value && packet_traits<DstScalar>::HasAdd
};
};
/** \internal
* \brief Template functor for scalar/packet assignment with subtraction
*
*/
template<typename DstScalar,typename SrcScalar> struct sub_assign_op {
EIGEN_EMPTY_STRUCT_CTOR(sub_assign_op)
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void assignCoeff(DstScalar& a, const SrcScalar& b) const { a -= b; }
template<int Alignment, typename Packet>
EIGEN_STRONG_INLINE void assignPacket(DstScalar* a, const Packet& b) const
{ internal::pstoret<DstScalar,Packet,Alignment>(a,internal::psub(internal::ploadt<Packet,Alignment>(a),b)); }
};
template<typename DstScalar,typename SrcScalar>
struct functor_traits<sub_assign_op<DstScalar,SrcScalar> > {
enum {
Cost = NumTraits<DstScalar>::ReadCost + NumTraits<DstScalar>::AddCost,
PacketAccess = is_same<DstScalar,SrcScalar>::value && packet_traits<DstScalar>::HasSub
};
};
/** \internal
* \brief Template functor for scalar/packet assignment with multiplication
*
*/
template<typename DstScalar, typename SrcScalar=DstScalar>
struct mul_assign_op {
EIGEN_EMPTY_STRUCT_CTOR(mul_assign_op)
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void assignCoeff(DstScalar& a, const SrcScalar& b) const { a *= b; }
template<int Alignment, typename Packet>
EIGEN_STRONG_INLINE void assignPacket(DstScalar* a, const Packet& b) const
{ internal::pstoret<DstScalar,Packet,Alignment>(a,internal::pmul(internal::ploadt<Packet,Alignment>(a),b)); }
};
template<typename DstScalar, typename SrcScalar>
struct functor_traits<mul_assign_op<DstScalar,SrcScalar> > {
enum {
Cost = NumTraits<DstScalar>::ReadCost + NumTraits<DstScalar>::MulCost,
PacketAccess = is_same<DstScalar,SrcScalar>::value && packet_traits<DstScalar>::HasMul
};
};
/** \internal
* \brief Template functor for scalar/packet assignment with diviving
*
*/
template<typename DstScalar, typename SrcScalar=DstScalar> struct div_assign_op {
EIGEN_EMPTY_STRUCT_CTOR(div_assign_op)
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void assignCoeff(DstScalar& a, const SrcScalar& b) const { a /= b; }
template<int Alignment, typename Packet>
EIGEN_STRONG_INLINE void assignPacket(DstScalar* a, const Packet& b) const
{ internal::pstoret<DstScalar,Packet,Alignment>(a,internal::pdiv(internal::ploadt<Packet,Alignment>(a),b)); }
};
template<typename DstScalar, typename SrcScalar>
struct functor_traits<div_assign_op<DstScalar,SrcScalar> > {
enum {
Cost = NumTraits<DstScalar>::ReadCost + NumTraits<DstScalar>::MulCost,
PacketAccess = is_same<DstScalar,SrcScalar>::value && packet_traits<DstScalar>::HasDiv
};
};
/** \internal
* \brief Template functor for scalar/packet assignment with swapping
*
* It works as follow. For a non-vectorized evaluation loop, we have:
* for(i) func(A.coeffRef(i), B.coeff(i));
* where B is a SwapWrapper expression. The trick is to make SwapWrapper::coeff behaves like a non-const coeffRef.
* Actually, SwapWrapper might not even be needed since even if B is a plain expression, since it has to be writable
* B.coeff already returns a const reference to the underlying scalar value.
*
* The case of a vectorized loop is more tricky:
* for(i,j) func.assignPacket<A_Align>(&A.coeffRef(i,j), B.packet<B_Align>(i,j));
* Here, B must be a SwapWrapper whose packet function actually returns a proxy object holding a Scalar*,
* the actual alignment and Packet type.
*
*/
template<typename Scalar> struct swap_assign_op {
EIGEN_EMPTY_STRUCT_CTOR(swap_assign_op)
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void assignCoeff(Scalar& a, const Scalar& b) const
{
#ifdef __CUDACC__
// FIXME is there some kind of cuda::swap?
Scalar t=b; const_cast<Scalar&>(b)=a; a=t;
#else
using std::swap;
swap(a,const_cast<Scalar&>(b));
#endif
}
};
template<typename Scalar>
struct functor_traits<swap_assign_op<Scalar> > {
enum {
Cost = 3 * NumTraits<Scalar>::ReadCost,
PacketAccess = packet_traits<Scalar>::Vectorizable
};
};
} // namespace internal
} // namespace Eigen
#endif // EIGEN_ASSIGNMENT_FUNCTORS_H
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