152 lines
5.2 KiB
C++
152 lines
5.2 KiB
C++
/***************************************************************************************************
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* Copyright (c) 2017-2018, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the NVIDIA CORPORATION nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TOR (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************************************/
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/*! \file
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\brief Defines a structure containing strides, bounds, and a pointer to tensor data.
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*/
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#pragma once
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#include <typeinfo>
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#include <cutlass/coord.h>
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#include <cutlass/cutlass.h>
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#include <cutlass/vector.h>
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namespace cutlass {
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// Structure modeling a pointer and stride into a tensor
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template <typename Storage_, int Rank_>
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class TensorRef {
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public:
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/// Data type of individual access
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typedef Storage_ Storage;
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/// Rank of tensor
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static int const Rank = Rank_;
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private:
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//
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// Data members
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//
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/// Pointer to storage element
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Storage* ptr_;
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/// Stride information
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Coord<Rank> stride_;
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public:
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//
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// Methods
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//
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/// Default ctor
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CUTLASS_HOST_DEVICE
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TensorRef() : ptr_(nullptr) {}
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/// Constructs from a pointer, size, and stride
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CUTLASS_HOST_DEVICE
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TensorRef(Storage* ptr, Coord<Rank> stride) : ptr_(ptr), stride_(stride) {}
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/// Updates the pointer, stride, and location within a TensorRef
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CUTLASS_HOST_DEVICE
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void reset(Storage* ptr = nullptr, Coord<Rank> stride = Coord<Rank>(0)) {
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ptr_ = ptr;
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stride_ = stride;
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}
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/// Conversion function
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template <typename T>
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TensorRef<T, Rank> convert() {
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Coord<Rank> converted_stride;
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for (int i = 0; i < Rank - 1; ++i) {
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converted_stride[i] = stride_[i] * Extent<Storage>::kValue / Extent<T>::kValue;
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}
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converted_stride[Rank - 1] = stride_[Rank - 1];
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return TensorRef<T, Rank>(reinterpret_cast<T*>(ptr_), converted_stride);
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}
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/// Returns true if the TensorRef may be safely accessed
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CUTLASS_HOST_DEVICE
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bool good() const { return ptr_ != nullptr; }
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/// Returns the pointer to referenced data
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CUTLASS_HOST_DEVICE
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Storage* data() const { return ptr_; }
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/// Returns the stride of the tensor
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CUTLASS_HOST_DEVICE
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Coord<Rank> const& stride() const { return stride_; }
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/// Returns the stride of the tensor in the given dimension
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CUTLASS_HOST_DEVICE
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int const& stride(int dim) const { return stride_.at(dim); }
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/// Returns the maximum stride element as the 'leading dimension'
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CUTLASS_HOST_DEVICE
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int leading_dim() const { return __NV_STD_MAX(stride_[1], stride_[2]); }
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/// Computes the offset of an index from the origin of the tensor
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CUTLASS_HOST_DEVICE
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long long offset(Coord<Rank> const& coord) const {
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return stride_.template dot<long long>(coord);
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}
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/// Returns a reference to the element at a given Coord
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CUTLASS_HOST_DEVICE
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Storage& at(Coord<Rank> const& coord) const { return ptr_[offset(coord)]; }
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/// Element-wise accessor
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Storage& operator[](Coord<Rank> const& coord) const { return at(coord); }
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/// Returns a reference to the element at a given Coord
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CUTLASS_HOST_DEVICE
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Storage& at(int idx) const { return ptr_[idx]; }
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/// Element-wise accessor
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Storage& operator[](int idx) const { return at(idx); }
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/// Adds an offset to the pointer
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CUTLASS_HOST_DEVICE
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TensorRef& advance(Coord<Rank> const& b) {
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ptr_ += offset(b);
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return *this;
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}
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/// Returns a TensorRef offset by a given amount
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CUTLASS_HOST_DEVICE
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TensorRef operator+(Coord<Rank> const& b) const { return TensorRef(ptr_ + offset(b), stride_); }
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/// Returns a TensorRef offset by a given amount
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CUTLASS_HOST_DEVICE
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TensorRef operator-(Coord<Rank> const& b) const { return TensorRef(ptr_ - offset(b), stride_); }
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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} // namespace cutlass
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