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#ifndef __BTAS_DOT_IMPL_H
#define __BTAS_DOT_IMPL_H 1
#include <algorithm>
#include <iterator>
#include <type_traits>
#include <btas/tensor_traits.h>
#include <btas/types.h>
#include <btas/generic/numeric_type.h>
#include <btas/generic/tensor_iterator_wrapper.h>
namespace btas {
template<typename _T>
struct __dot_result_type {
typedef typename __dot_result_type<typename _T::value_type>::type type;
};
template<> struct __dot_result_type<float> { typedef float type; };
template<> struct __dot_result_type<double> { typedef double type; };
template<> struct __dot_result_type<std::complex<float>> { typedef std::complex<float> type; };
template<> struct __dot_result_type<std::complex<double>> { typedef std::complex<double> type; };
// ================================================================================================
/// Dot with conjugation for general case
template<typename _T>
struct dotc_impl
{
typedef typename __dot_result_type<_T>::type return_type;
template<class _IteratorX, class _IteratorY>
static return_type call (
const unsigned long& Nsize,
_IteratorX itrX, const typename std::iterator_traits<_IteratorX>::difference_type& incX,
_IteratorY itrY, const typename std::iterator_traits<_IteratorY>::difference_type& incY)
{
return_type val = dotc(*itrX, *itrY);
itrX += incX;
itrY += incY;
for (unsigned long i = 1; i < Nsize; ++i, itrX += incX, itrY += incY)
{
val += dotc(*itrX, *itrY);
}
return val;
}
};
/// Dot without conjugation for general case
template<typename _T>
struct dotu_impl
{
typedef typename __dot_result_type<_T>::type return_type;
template<class _IteratorX, class _IteratorY>
static return_type call (
const unsigned long& Nsize,
_IteratorX itrX, const typename std::iterator_traits<_IteratorX>::difference_type& incX,
_IteratorY itrY, const typename std::iterator_traits<_IteratorY>::difference_type& incY)
{
// redirect to dotc, otherwise must be specialized
return dotc_impl<_T>::call(Nsize, itrX, incX, itrY, incY);
}
};
template<>
struct dotc_impl<float>
{
typedef float return_type;
static return_type call (
const unsigned long& Nsize,
const float* itrX, const typename std::iterator_traits<float*>::difference_type& incX,
const float* itrY, const typename std::iterator_traits<float*>::difference_type& incY)
{
#ifdef _HAS_CBLAS
return cblas_sdot(Nsize, itrX, incX, itrY, incY);
#else
return_type val = (*itrX) * (*itrY);
itrX += incX;
itrY += incY;
for (unsigned long i = 1; i < Nsize; ++i, itrX += incX, itrY += incY)
{
val += (*itrX) * (*itrY);
}
return val;
#endif
}
};
template<>
struct dotc_impl<double>
{
typedef double return_type;
static return_type call (
const unsigned long& Nsize,
const double* itrX, const typename std::iterator_traits<double*>::difference_type& incX,
const double* itrY, const typename std::iterator_traits<double*>::difference_type& incY)
{
#ifdef _HAS_CBLAS
return cblas_ddot(Nsize, itrX, incX, itrY, incY);
#else
return_type val = (*itrX) * (*itrY);
itrX += incX;
itrY += incY;
for (unsigned long i = 1; i < Nsize; ++i, itrX += incX, itrY += incY)
{
val += (*itrX) * (*itrY);
}
return val;
#endif
}
};
template<>
struct dotc_impl<std::complex<float>>
{
typedef std::complex<float> return_type;
static return_type call (
const unsigned long& Nsize,
const std::complex<float>* itrX, const typename std::iterator_traits<std::complex<float>*>::difference_type& incX,
const std::complex<float>* itrY, const typename std::iterator_traits<std::complex<float>*>::difference_type& incY)
{
return_type val;
#ifdef _HAS_CBLAS
cblas_cdotc_sub(Nsize, itrX, incX, itrY, incY, &val);
#else
val = std::conj(*itrX) * (*itrY);
itrX += incX;
itrY += incY;
for (unsigned long i = 1; i < Nsize; ++i, itrX += incX, itrY += incY)
{
val += std::conj(*itrX) * (*itrY);
}
#endif
return val;
}
};
template<>
struct dotu_impl<std::complex<float>>
{
typedef std::complex<float> return_type;
static return_type call (
const unsigned long& Nsize,
const std::complex<float>* itrX, const typename std::iterator_traits<std::complex<float>*>::difference_type& incX,
const std::complex<float>* itrY, const typename std::iterator_traits<std::complex<float>*>::difference_type& incY)
{
return_type val;
#ifdef _HAS_CBLAS
cblas_cdotu_sub(Nsize, itrX, incX, itrY, incY, &val);
#else
val = (*itrX) * (*itrY);
itrX += incX;
itrY += incY;
for (unsigned long i = 1; i < Nsize; ++i, itrX += incX, itrY += incY)
{
val += *itrX * (*itrY);
}
#endif
return val;
}
};
template<>
struct dotc_impl<std::complex<double>>
{
typedef std::complex<double> return_type;
static return_type call (
const unsigned long& Nsize,
const std::complex<double>* itrX, const typename std::iterator_traits<std::complex<double>*>::difference_type& incX,
const std::complex<double>* itrY, const typename std::iterator_traits<std::complex<double>*>::difference_type& incY)
{
return_type val;
#ifdef _HAS_CBLAS
cblas_zdotc_sub(Nsize, itrX, incX, itrY, incY, &val);
#else
val = std::conj(*itrX) * (*itrY);
itrX += incX;
itrY += incY;
for (unsigned long i = 1; i < Nsize; ++i, itrX += incX, itrY += incY)
{
val += std::conj(*itrX) * (*itrY);
}
#endif
return val;
}
};
template<>
struct dotu_impl<std::complex<double>>
{
typedef std::complex<double> return_type;
static return_type call (
const unsigned long& Nsize,
const std::complex<double>* itrX, const typename std::iterator_traits<std::complex<double>*>::difference_type& incX,
const std::complex<double>* itrY, const typename std::iterator_traits<std::complex<double>*>::difference_type& incY)
{
return_type val;
#ifdef _HAS_CBLAS
cblas_zdotu_sub(Nsize, itrX, incX, itrY, incY, &val);
#else
val = (*itrX) * (*itrY);
itrX += incX;
itrY += incY;
for (unsigned long i = 1; i < Nsize; ++i, itrX += incX, itrY += incY)
{
val += *itrX * (*itrY);
}
#endif
return val;
}
};
// ================================================================================================
/// Generic implementation of BLAS DOT in terms of C++ iterator
template<class _IteratorX, class _IteratorY>
typename __dot_result_type<typename std::iterator_traits<_IteratorX>::value_type>::type
dotc (
const unsigned long& Nsize,
_IteratorX itrX, const typename std::iterator_traits<_IteratorX>::difference_type& incX,
_IteratorY itrY, const typename std::iterator_traits<_IteratorY>::difference_type& incY)
{
typedef std::iterator_traits<_IteratorX> __traits_X;
typedef std::iterator_traits<_IteratorY> __traits_Y;
static_assert(std::is_same<typename __traits_X::value_type, typename __traits_Y::value_type>::value, "value type of Y must be the same as that of X");
static_assert(std::is_same<typename __traits_X::iterator_category, std::random_access_iterator_tag>::value, "iterator X must be a random access iterator");
static_assert(std::is_same<typename __traits_Y::iterator_category, std::random_access_iterator_tag>::value, "iterator Y must be a random access iterator");
return dotc_impl<typename __traits_X::value_type>::call(Nsize, itrX, incX, itrY, incY);
}
/// Generic implementation of BLAS DOT in terms of C++ iterator
template<class _IteratorX, class _IteratorY>
typename __dot_result_type<typename std::iterator_traits<_IteratorX>::value_type>::type
dotu (
const unsigned long& Nsize,
_IteratorX itrX, const typename std::iterator_traits<_IteratorX>::difference_type& incX,
_IteratorY itrY, const typename std::iterator_traits<_IteratorY>::difference_type& incY)
{
typedef std::iterator_traits<_IteratorX> __traits_X;
typedef std::iterator_traits<_IteratorY> __traits_Y;
static_assert(std::is_same<typename __traits_X::value_type, typename __traits_Y::value_type>::value, "value type of Y must be the same as that of X");
static_assert(std::is_same<typename __traits_X::iterator_category, std::random_access_iterator_tag>::value, "iterator X must be a random access iterator");
static_assert(std::is_same<typename __traits_Y::iterator_category, std::random_access_iterator_tag>::value, "iterator Y must be a random access iterator");
return dotu_impl<typename __traits_X::value_type>::call(Nsize, itrX, incX, itrY, incY);
}
/// Generic implementation of BLAS DOT in terms of C++ iterator
template<class _IteratorX, class _IteratorY>
typename __dot_result_type<typename std::iterator_traits<_IteratorX>::value_type>::type
dot (
const unsigned long& Nsize,
_IteratorX itrX, const typename std::iterator_traits<_IteratorX>::difference_type& incX,
_IteratorY itrY, const typename std::iterator_traits<_IteratorY>::difference_type& incY)
{
return dotc(Nsize, itrX, incX, itrY, incY);
}
// ================================================================================================
/// Convenient wrapper to call BLAS DOT-C from tensor objects
template<
class _TensorX,
class _TensorY,
class = typename std::enable_if<
is_tensor<_TensorX>::value &
is_tensor<_TensorY>::value
>::type
>
typename __dot_result_type<typename _TensorX::value_type>::type
dotc (const _TensorX& X, const _TensorY& Y)
{
typedef typename _TensorX::value_type value_type;
static_assert(std::is_same<value_type, typename _TensorY::value_type>::value, "value type of Y must be the same as that of X");
if (X.empty() || Y.empty())
{
return 0;
}
auto itrX = tbegin(X);
auto itrY = tbegin(Y);
return dotc(X.size(), itrX, 1, itrY, 1);
}
/// Convenient wrapper to call BLAS DOT-U from tensor objects
template<
class _TensorX,
class _TensorY,
class = typename std::enable_if<
is_tensor<_TensorX>::value &
is_tensor<_TensorY>::value
>::type
>
typename __dot_result_type<typename _TensorX::value_type>::type
dotu (const _TensorX& X, const _TensorY& Y)
{
typedef typename _TensorX::value_type value_type;
static_assert(std::is_same<value_type, typename _TensorY::value_type>::value, "value type of Y must be the same as that of X");
if (X.empty() || Y.empty())
{
return 0;
}
auto itrX = tbegin(X);
auto itrY = tbegin(Y);
return dotu(X.size(), itrX, 1, itrY, 1);
}
/// Convenient wrapper to call BLAS DOT from tensor objects
template<
class _TensorX,
class _TensorY,
class = typename std::enable_if<
is_tensor<_TensorX>::value &
is_tensor<_TensorY>::value
>::type
>
typename __dot_result_type<typename _TensorX::value_type>::type
dot (const _TensorX& X, const _TensorY& Y)
{
return dotc(X, Y);
}
} // namespace btas
#endif // __BTAS_DOT_IMPL_H
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