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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, bounds, and a pointer to tensor data.
-*/
-#pragma once
-
-#include <typeinfo>
-
-#include <cutlass/coord.h>
-#include <cutlass/cutlass.h>
-#include <cutlass/vector.h>
-
-namespace cutlass {
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-/// Structure modeling a pointer and stride into a tensor
-template <typename Storage_, int Rank_>
-class TensorRef {
- public:
- /// Data type of individual access
- typedef Storage_ Storage;
-
- /// Rank of tensor
- static int const Rank = Rank_;
-
- private:
- //
- // Data members
- //
-
- /// Pointer to storage element
- Storage* ptr_;
-
- /// Stride information
- Coord<Rank> stride_;
-
- public:
- //
- // Methods
- //
-
- /// Default ctor
- CUTLASS_HOST_DEVICE
- TensorRef() : ptr_(nullptr) {}
-
- /// Constructs from a pointer, size, and stride
- CUTLASS_HOST_DEVICE
- TensorRef(Storage* ptr, Coord<Rank> stride) : ptr_(ptr), stride_(stride) {}
-
- /// Updates the pointer, stride, and location within a TensorRef
- CUTLASS_HOST_DEVICE
- void reset(Storage* ptr = nullptr, Coord<Rank> stride = Coord<Rank>(0)) {
- ptr_ = ptr;
- stride_ = stride;
- }
-
- /// Conversion function
- template <typename T>
- TensorRef<T, Rank> convert() {
- Coord<Rank> converted_stride;
- for (int i = 0; i < Rank - 1; ++i) {
- converted_stride[i] = stride_[i] * Extent<Storage>::kValue / Extent<T>::kValue;
- }
- converted_stride[Rank - 1] = stride_[Rank - 1];
-
- return TensorRef<T, Rank>(reinterpret_cast<T*>(ptr_), converted_stride);
- }
-
- /// Returns true if the TensorRef may be safely accessed
- CUTLASS_HOST_DEVICE
- bool good() const { return ptr_ != nullptr; }
-
- /// Returns the pointer to referenced data
- CUTLASS_HOST_DEVICE
- Storage* data() const { return ptr_; }
-
- /// Returns the stride of the tensor
- CUTLASS_HOST_DEVICE
- Coord<Rank> const& stride() const { return stride_; }
-
- /// Returns the stride of the tensor in the given dimension
- CUTLASS_HOST_DEVICE
- int const& stride(int dim) const { return stride_.at(dim); }
-
- /// Returns the maximum stride element as the 'leading dimension'
- CUTLASS_HOST_DEVICE
- int leading_dim() const { return __NV_STD_MAX(stride_[1], stride_[2]); }
-
- /// Computes the offset of an index from the origin of the tensor
- CUTLASS_HOST_DEVICE
- long long offset(Coord<Rank> const& coord) const {
- return stride_.template dot<long long>(coord);
- }
-
- /// Returns a reference to the element at a given Coord
- CUTLASS_HOST_DEVICE
- Storage& at(Coord<Rank> const& coord) const { return ptr_[offset(coord)]; }
-
- /// Element-wise accessor
- Storage& operator[](Coord<Rank> const& coord) const { return at(coord); }
-
- /// Returns a reference to the element at a given Coord
- CUTLASS_HOST_DEVICE
- Storage& at(int idx) const { return ptr_[idx]; }
-
- /// Element-wise accessor
- Storage& operator[](int idx) const { return at(idx); }
-
- /// Adds an offset to the pointer
- CUTLASS_HOST_DEVICE
- TensorRef& advance(Coord<Rank> const& b) {
- ptr_ += offset(b);
- return *this;
- }
-
- /// Returns a TensorRef offset by a given amount
- CUTLASS_HOST_DEVICE
- TensorRef operator+(Coord<Rank> const& b) const { return TensorRef(ptr_ + offset(b), stride_); }
-
- /// Returns a TensorRef offset by a given amount
- CUTLASS_HOST_DEVICE
- TensorRef operator-(Coord<Rank> const& b) const { return TensorRef(ptr_ - offset(b), stride_); }
-};
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-} // namespace cutlass