sellp.hpp

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#ifndef GKO_CORE_MATRIX_SELLP_HPP_
#define GKO_CORE_MATRIX_SELLP_HPP_


#include <ginkgo/core/base/array.hpp>
#include <ginkgo/core/base/lin_op.hpp>


namespace gko {
namespace matrix {


constexpr int default_slice_size = 64;
constexpr int default_stride_factor = 1;


template <typename ValueType>
class Dense;

template <typename ValueType, typename IndexType>
class Csr;

template <typename ValueType = default_precision, typename IndexType = int32>
class Sellp : public EnableLinOp<Sellp<ValueType, IndexType>>,
              public EnableCreateMethod<Sellp<ValueType, IndexType>>,
              public ConvertibleTo<Dense<ValueType>>,
              public ConvertibleTo<Csr<ValueType, IndexType>>,
              public ReadableFromMatrixData<ValueType, IndexType>,
              public WritableToMatrixData<ValueType, IndexType> {
    friend class EnableCreateMethod<Sellp>;
    friend class EnablePolymorphicObject<Sellp, LinOp>;
    friend class Dense<ValueType>;
    friend class Csr<ValueType, IndexType>;

public:
    using EnableLinOp<Sellp>::convert_to;
    using EnableLinOp<Sellp>::move_to;

    using value_type = ValueType;
    using index_type = IndexType;
    using mat_data = matrix_data<ValueType, IndexType>;

    void convert_to(Dense<ValueType> *other) const override;

    void move_to(Dense<ValueType> *other) override;

    void convert_to(Csr<ValueType, IndexType> *other) const override;

    void move_to(Csr<ValueType, IndexType> *other) override;

    void read(const mat_data &data) override;

    void write(mat_data &data) const override;

    value_type *get_values() noexcept { return values_.get_data(); }

    const value_type *get_const_values() const noexcept
    {
        return values_.get_const_data();
    }

    index_type *get_col_idxs() noexcept { return col_idxs_.get_data(); }

    const index_type *get_const_col_idxs() const noexcept
    {
        return col_idxs_.get_const_data();
    }

    size_type *get_slice_lengths() noexcept
    {
        return slice_lengths_.get_data();
    }

    const size_type *get_const_slice_lengths() const noexcept
    {
        return slice_lengths_.get_const_data();
    }

    size_type *get_slice_sets() noexcept { return slice_sets_.get_data(); }

    const size_type *get_const_slice_sets() const noexcept
    {
        return slice_sets_.get_const_data();
    }

    size_type get_slice_size() const noexcept { return slice_size_; }

    size_type get_stride_factor() const noexcept { return stride_factor_; }

    size_type get_total_cols() const noexcept { return total_cols_; }

    size_type get_num_stored_elements() const noexcept
    {
        return values_.get_num_elems();
    }

    value_type &val_at(size_type row, size_type slice_set,
                       size_type idx) noexcept
    {
        return values_.get_data()[this->linearize_index(row, slice_set, idx)];
    }

    value_type val_at(size_type row, size_type slice_set, size_type idx) const
        noexcept
    {
        return values_
            .get_const_data()[this->linearize_index(row, slice_set, idx)];
    }

    index_type &col_at(size_type row, size_type slice_set,
                       size_type idx) noexcept
    {
        return this->get_col_idxs()[this->linearize_index(row, slice_set, idx)];
    }

    index_type col_at(size_type row, size_type slice_set, size_type idx) const
        noexcept
    {
        return this
            ->get_const_col_idxs()[this->linearize_index(row, slice_set, idx)];
    }

protected:
    Sellp(std::shared_ptr<const Executor> exec, const dim<2> &size = dim<2>{})
        : Sellp(std::move(exec), size,
                ceildiv(size[0], default_slice_size) * size[1])
    {}

    Sellp(std::shared_ptr<const Executor> exec, const dim<2> &size,
          size_type total_cols)
        : Sellp(std::move(exec), size, default_slice_size,
                default_stride_factor, total_cols)
    {}

    Sellp(std::shared_ptr<const Executor> exec, const dim<2> &size,
          size_type slice_size, size_type stride_factor, size_type total_cols)
        : EnableLinOp<Sellp>(exec, size),
          values_(exec, slice_size * total_cols),
          col_idxs_(exec, slice_size * total_cols),
          slice_lengths_(exec,
                         (size[0] == 0) ? 0 : ceildiv(size[0], slice_size)),
          slice_sets_(exec,
                      (size[0] == 0) ? 0 : ceildiv(size[0], slice_size) + 1),
          slice_size_(slice_size),
          stride_factor_(stride_factor),
          total_cols_(total_cols)
    {}

    void apply_impl(const LinOp *b, LinOp *x) const override;

    void apply_impl(const LinOp *alpha, const LinOp *b, const LinOp *beta,
                    LinOp *x) const override;

    size_type linearize_index(size_type row, size_type slice_set,
                              size_type col) const noexcept
    {
        return (slice_set + col) * slice_size_ + row;
    }

private:
    Array<value_type> values_{0};
    Array<index_type> col_idxs_{0};
    Array<size_type> slice_lengths_{0};
    Array<size_type> slice_sets_{0};
    size_type slice_size_;
    size_type stride_factor_;
    size_type total_cols_{0};
};


}  // namespace matrix
}  // namespace gko


#endif  // GKO_CORE_MATRIX_SELLP_HPP_