AssignmentFunctors.h

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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
 
// IWYU pragma: private
#include "../InternalHeaderCheck.h"
 
namespace Eigen {
 
namespace internal {
 
template <typename DstScalar, typename SrcScalar>
struct 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
  };
};
 
template <typename DstScalar, typename SrcScalar>
struct 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
  };
};
 
template <typename DstScalar, typename SrcScalar>
struct 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
  };
};
 
template <typename DstScalar, typename SrcScalar = DstScalar>
struct 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
  };
};
 
template <typename DstScalar, typename SrcScalar = DstScalar>
struct 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
  };
};
 
template <typename Scalar>
struct swap_assign_op {
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void assignCoeff(Scalar& a, const Scalar& b) const {
#ifdef EIGEN_GPUCC
    // 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 =
#if defined(EIGEN_VECTORIZE_AVX) && (EIGEN_CLANG_STRICT_LESS_THAN(8, 0, 0) || EIGEN_COMP_CLANGAPPLE)
        // This is a partial workaround for a bug in clang generating bad code
        // when mixing 256/512 bits loads and 128 bits moves.
        // See http://eigen.tuxfamily.org/bz/show_bug.cgi?id=1684
        //     https://bugs.llvm.org/show_bug.cgi?id=40815
    0
#else
        packet_traits<Scalar>::Vectorizable
#endif
  };
};
 
}  // namespace internal
 
}  // namespace Eigen
 
#endif  // EIGEN_ASSIGNMENT_FUNCTORS_H