eigen/unsupported/Eigen/src/SpecialFunctions/arch/CUDA/CudaSpecialFunctions.h

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2014 Benoit Steiner <benoit.steiner.goog@gmail.com>
//
// 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_CUDA_SPECIALFUNCTIONS_H
#define EIGEN_CUDA_SPECIALFUNCTIONS_H

namespace Eigen {

namespace internal {

// Make sure this is only available when targeting a GPU: we don't want to
// introduce conflicts between these packet_traits definitions and the ones
// we'll use on the host side (SSE, AVX, ...)
#if defined(__CUDACC__) && defined(EIGEN_USE_GPU)

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
float4 plgamma<float4>(const float4& a)
{
  return make_float4(lgammaf(a.x), lgammaf(a.y), lgammaf(a.z), lgammaf(a.w));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
double2 plgamma<double2>(const double2& a)
{
  using numext::lgamma;
  return make_double2(lgamma(a.x), lgamma(a.y));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
float4 pdigamma<float4>(const float4& a)
{
  using numext::digamma;
  return make_float4(digamma(a.x), digamma(a.y), digamma(a.z), digamma(a.w));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
double2 pdigamma<double2>(const double2& a)
{
  using numext::digamma;
  return make_double2(digamma(a.x), digamma(a.y));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
float4 pzeta<float4>(const float4& x, const float4& q)
{
    using numext::zeta;
    return make_float4(zeta(x.x, q.x), zeta(x.y, q.y), zeta(x.z, q.z), zeta(x.w, q.w));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
double2 pzeta<double2>(const double2& x, const double2& q)
{
    using numext::zeta;
    return make_double2(zeta(x.x, q.x), zeta(x.y, q.y));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
float4 ppolygamma<float4>(const float4& n, const float4& x)
{
    using numext::polygamma;
    return make_float4(polygamma(n.x, x.x), polygamma(n.y, x.y), polygamma(n.z, x.z), polygamma(n.w, x.w));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
double2 ppolygamma<double2>(const double2& n, const double2& x)
{
    using numext::polygamma;
    return make_double2(polygamma(n.x, x.x), polygamma(n.y, x.y));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
float4 perf<float4>(const float4& a)
{
  return make_float4(erff(a.x), erff(a.y), erff(a.z), erff(a.w));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
double2 perf<double2>(const double2& a)
{
  using numext::erf;
  return make_double2(erf(a.x), erf(a.y));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
float4 perfc<float4>(const float4& a)
{
  using std::erfcf;
  return make_float4(erfcf(a.x), erfcf(a.y), erfcf(a.z), erfcf(a.w));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
double2 perfc<double2>(const double2& a)
{
  using numext::erfc;
  return make_double2(erfc(a.x), erfc(a.y));
}


template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
float4 pigamma<float4>(const float4& a, const float4& x)
{
  using numext::igamma;
  return make_float4(
      igamma(a.x, x.x),
      igamma(a.y, x.y),
      igamma(a.z, x.z),
      igamma(a.w, x.w));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
double2 pigamma<double2>(const double2& a, const double2& x)
{
  using numext::igamma;
  return make_double2(igamma(a.x, x.x), igamma(a.y, x.y));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
float4 pigammac<float4>(const float4& a, const float4& x)
{
  using numext::igammac;
  return make_float4(
      igammac(a.x, x.x),
      igammac(a.y, x.y),
      igammac(a.z, x.z),
      igammac(a.w, x.w));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
double2 pigammac<double2>(const double2& a, const double2& x)
{
  using numext::igammac;
  return make_double2(igammac(a.x, x.x), igammac(a.y, x.y));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
float4 pbetainc<float4>(const float4& a, const float4& b, const float4& x)
{
  using numext::betainc;
  return make_float4(
      betainc(a.x, b.x, x.x),
      betainc(a.y, b.y, x.y),
      betainc(a.z, b.z, x.z),
      betainc(a.w, b.w, x.w));
}

template<> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
double2 pbetainc<double2>(const double2& a, const double2& b, const double2& x)
{
  using numext::betainc;
  return make_double2(betainc(a.x, b.x, x.x), betainc(a.y, b.y, x.y));
}

#endif

} // end namespace internal

} // end namespace Eigen

#endif // EIGEN_CUDA_SPECIALFUNCTIONS_H