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// Common helper functions used for dealing with CUDA API datatypes.
//
// These are typically placed here for use by multiple source components (for
// example, BLAS and executor components).
#ifndef TENSORFLOW_STREAM_EXECUTOR_CUDA_CUDA_HELPERS_H_
#define TENSORFLOW_STREAM_EXECUTOR_CUDA_CUDA_HELPERS_H_
#include <stddef.h>
#include <complex>
#include "third_party/gpus/cuda/include/cuComplex.h"
#include "third_party/gpus/cuda/include/cuda.h"
namespace perftools {
namespace gputools {
class Stream;
template <typename ElemT>
class DeviceMemory;
namespace cuda {
// Converts a const DeviceMemory reference to its underlying typed pointer in
// CUDA
// device memory.
template <typename T>
const T *CUDAMemory(const DeviceMemory<T> &mem) {
return static_cast<const T *>(mem.opaque());
}
// Converts a (non-const) DeviceMemory pointer reference to its underlying typed
// pointer in CUDA device device memory.
template <typename T>
T *CUDAMemoryMutable(DeviceMemory<T> *mem) {
return static_cast<T *>(mem->opaque());
}
CUstream AsCUDAStreamValue(Stream *stream);
static_assert(sizeof(std::complex<float>) == sizeof(cuComplex),
"std::complex<float> and cuComplex should have the same size");
static_assert(offsetof(cuComplex, x) == 0,
"The real part of cuComplex should appear first.");
static_assert(sizeof(std::complex<double>) == sizeof(cuDoubleComplex),
"std::complex<double> and cuDoubleComplex should have the same "
"size");
static_assert(offsetof(cuDoubleComplex, x) == 0,
"The real part of cuDoubleComplex should appear first.");
// Type traits to get CUDA complex types from std::complex<>.
template <typename T>
struct CUDAComplexT {
typedef T type;
};
template <>
struct CUDAComplexT<std::complex<float>> {
typedef cuComplex type;
};
template <>
struct CUDAComplexT<std::complex<double>> {
typedef cuDoubleComplex type;
};
// Converts pointers of std::complex<> to pointers of
// cuComplex/cuDoubleComplex. No type conversion for non-complex types.
template <typename T>
inline const typename CUDAComplexT<T>::type *CUDAComplex(const T *p) {
return reinterpret_cast<const typename CUDAComplexT<T>::type *>(p);
}
template <typename T>
inline typename CUDAComplexT<T>::type *CUDAComplex(T *p) {
return reinterpret_cast<typename CUDAComplexT<T>::type *>(p);
}
// Converts values of std::complex<float/double> to values of
// cuComplex/cuDoubleComplex.
inline cuComplex CUDAComplexValue(std::complex<float> val) {
return {val.real(), val.imag()};
}
inline cuDoubleComplex CUDAComplexValue(std::complex<double> val) {
return {val.real(), val.imag()};
}
} // namespace cuda
} // namespace gputools
} // namespace perftools
#endif // TENSORFLOW_STREAM_EXECUTOR_CUDA_CUDA_HELPERS_H_
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