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142 lines
4.3 KiB
142 lines
4.3 KiB
// Copyright 2015 The Gemmlowp Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// map.h: a minimalist view-existing-buffer-as-a-matrix class,
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// which is how gemmlowp interfaces with external matrix data.
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#ifndef GEMMLOWP_PUBLIC_MAP_H_
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#define GEMMLOWP_PUBLIC_MAP_H_
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#include "../internal/common.h"
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namespace gemmlowp {
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// The two storage orders allowed to map buffers as matrices: ColMajor
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// means column-major, RowMajor means row-major.
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enum class MapOrder { ColMajor, RowMajor };
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// A MatrixMap is a view of an existing buffer as a matrix. It does not own
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// the buffer.
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template <typename tScalar, MapOrder tOrder>
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class MatrixMap {
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public:
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typedef tScalar Scalar;
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static constexpr MapOrder kOrder = tOrder;
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protected:
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Scalar* data_; // not owned.
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int rows_, cols_, stride_;
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public:
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MatrixMap() : data_(nullptr), rows_(0), cols_(0), stride_(0) {}
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MatrixMap(Scalar* data, int rows, int cols)
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: data_(data),
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rows_(rows),
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cols_(cols),
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stride_(kOrder == MapOrder::ColMajor ? rows : cols) {}
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MatrixMap(Scalar* data, int rows, int cols, int stride)
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: data_(data), rows_(rows), cols_(cols), stride_(stride) {}
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MatrixMap(const MatrixMap& other)
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: data_(other.data_),
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rows_(other.rows_),
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cols_(other.cols_),
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stride_(other.stride_) {}
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int rows() const { return rows_; }
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int cols() const { return cols_; }
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int stride() const { return stride_; }
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int rows_stride() const { return kOrder == MapOrder::ColMajor ? 1 : stride_; }
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int cols_stride() const { return kOrder == MapOrder::RowMajor ? 1 : stride_; }
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Scalar* data() const { return data_; }
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Scalar* data(int row, int col) const {
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return data_ + row * rows_stride() + col * cols_stride();
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}
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Scalar& operator()(int row, int col) const { return *data(row, col); }
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MatrixMap block(int start_row, int start_col, int block_rows,
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int block_cols) const {
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assert(start_row >= 0);
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assert(start_row + block_rows <= rows_);
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assert(start_col >= 0);
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assert(start_col + block_cols <= cols_);
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return MatrixMap(data(start_row, start_col), block_rows, block_cols,
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stride_);
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}
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};
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enum class VectorShape { Col, Row };
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// A VectorMap is a view of an existing buffer as a vector. It does not own
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// the buffer.
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template <typename tScalar, VectorShape tShape>
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class VectorMap {
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public:
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typedef tScalar Scalar;
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static constexpr VectorShape kShape = tShape;
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protected:
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Scalar* data_; // not owned.
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int size_;
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public:
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VectorMap() : data_(nullptr), size_(0) {}
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VectorMap(Scalar* data, int size) : data_(data), size_(size) {}
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VectorMap(const VectorMap& other) : data_(other.data_), size_(other.size_) {}
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int size() const { return size_; }
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Scalar* data() const { return data_; }
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Scalar* data(int index) const { return data_ + index; }
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Scalar& operator()(int index) const { return *data(index); }
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VectorMap block(int start, int len) const {
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assert(start >= 0);
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assert(start + len <= size_);
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return VectorMap(data(start), len);
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}
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};
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// A VectorDup is a (duplicated value) vector where all components are the same.
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template <typename tScalar, VectorShape tShape>
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class VectorDup {
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public:
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typedef tScalar Scalar;
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static constexpr VectorShape kShape = tShape;
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protected:
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Scalar data_;
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int size_;
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public:
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VectorDup() : data_(0), size_(0) {}
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VectorDup(Scalar data, int size) : data_(data), size_(size) {}
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VectorDup(const VectorDup& other) : data_(other.data_), size_(other.size_) {}
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int size() const { return size_; }
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Scalar& operator()(int) const { return data_; }
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VectorDup block(int start, int len) const {
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assert(start >= 0);
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assert(start + len <= size_);
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(void)start;
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return VectorDup(data_, len);
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}
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};
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} // namespace gemmlowp
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#endif // GEMMLOWP_PUBLIC_MAP_H_
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