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/***************************************************************************************************
* Copyright (c) 2017-2018, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
* * Neither the name of the NVIDIA CORPORATION nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TOR (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************************************/
/*! \file
\brief Defines a structure containing strides and a pointer to tensor data.
*/
#pragma once
#include <cmath>
#include <cutlass/cutlass.h>
#include <cutlass/tensor_ref.h>
namespace cutlass {
////////////////////////////////////////////////////////////////////////////////////////////////////
/// Host-side reference implementation of tensor operations
template <typename T>
class TensorView : public TensorRef<T, 4> {
public:
/// Reference and stride
typedef TensorRef<T, 4> Base;
/// Reference and stride
typedef Base TensorRef_t;
/// Reference to constant type
typedef TensorRef<T const, 4> ConstTensorRef_t;
/// Rank of tensor
static int const Rank = TensorRef_t::Rank;
/// Type used to compute the offset of an element to the base of a tensor
typedef int Offset_t;
/// Coordinate into tensor
typedef Coord<Rank> Coord_t;
private:
//
// Data members
//
/// Pointer to pitch-linear memory
TensorRef_t ref_;
/// Dimensions of coordinate (independent of stride)
Coord_t size_;
public:
//
// Device and Host Methods
//
/// Default constructor
CUTLASS_HOST_DEVICE
TensorView() {}
/// Constructs a Tensor_view from a TensorRef and size
CUTLASS_HOST_DEVICE
TensorView(TensorRef_t const& _ref, Coord_t const& _size) : Base(_ref), size_(_size) {}
/// Returns true if the Tensor_view is bound to some memory
CUTLASS_HOST_DEVICE
bool good() const { return ref().good(); }
/// Returns a pointer to data
CUTLASS_HOST_DEVICE
T* data() const { return ref().data(); }
/// Updates the reference and size of a Tensor_view object
CUTLASS_HOST_DEVICE
void reset(TensorRef_t const& _ref = TensorRef_t(0), Coord_t const& _size = Coord_t()) {
Base::operator=(_ref);
size_ = _size;
}
/// Accesses the tensor reference pointing to data
CUTLASS_HOST_DEVICE
TensorRef_t& ref() { return *this; }
///
CUTLASS_HOST_DEVICE
ConstTensorRef_t const_ref() { return ConstTensorRef_t(data(), stride()); }
/// Accesses the tensor reference pointing to data
CUTLASS_HOST_DEVICE
TensorRef_t const& ref() const { return *this; }
/// Accesses the size
CUTLASS_HOST_DEVICE
Coord_t const& size() const { return size_; }
/// Accesses the size
CUTLASS_HOST_DEVICE
int size(int dim) const { return size_.at(dim); }
/// Accesses the stride
CUTLASS_HOST_DEVICE
Coord_t const& stride() const { return ref().stride(); }
/// Accesses the stride
CUTLASS_HOST_DEVICE
int const& stride(int dim) const { return ref().stride(dim); }
/// Assigns the Tensor_view
CUTLASS_HOST_DEVICE
TensorView& operator=(TensorView const& _tensor) {
Base::operator=(_tensor._ref);
size_ = _tensor.size_;
return *this;
}
/// Returns the index of an element
CUTLASS_HOST_DEVICE
Offset_t offset(Coord_t const& coord) const { return ref().offset(coord); }
/// Determines whether a location is within a tensor
CUTLASS_HOST_DEVICE
bool contains(Coord_t const& coord) const {
for (int dim = 0; dim < Rank; ++dim) {
if (coord.at(dim) >= size_.at(dim)) {
return false;
}
}
return true;
}
/// Element-wise accessor
CUTLASS_HOST_DEVICE
T& at(Coord_t const& coord) const { return ref().at(coord); }
/// Element-wise accessor
T& operator[](Coord<Rank> const& coord) const { return at(coord); }
/// Element-wise accessor
CUTLASS_HOST_DEVICE
T& at(Offset_t idx) const { return ref().at(idx); }
/// Returns a Tensor_view given location and size quantities
CUTLASS_HOST_DEVICE
TensorView<T> subview(Coord_t const& location, Coord_t size) const {
return TensorView<T>(ref() + location, size.clamp(size_ - location));
}
};
////////////////////////////////////////////////////////////////////////////////////////////////////
} // namespace cutlass
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