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+/*
+ * Copyright (c) 2019-2021 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#pragma once
+
+#include <algorithm>
+#include <array>
+#include <cassert>
+#include <initializer_list>
+
+namespace arm_gemm
+{
+template <unsigned int D>
+class NDRange
+{
+private:
+ std::array<unsigned int, D> m_sizes{};
+ std::array<unsigned int, D> m_totalsizes{};
+
+ class NDRangeIterator
+ {
+ private:
+ const NDRange &m_parent;
+ unsigned int m_pos = 0;
+ unsigned int m_end = 0;
+
+ public:
+ NDRangeIterator(const NDRange &p, unsigned int s, unsigned int e) : m_parent(p), m_pos(s), m_end(e)
+ {
+ }
+
+ bool done() const
+ {
+ return (m_pos >= m_end);
+ }
+
+ unsigned int dim(unsigned int d) const
+ {
+ unsigned int r = m_pos;
+
+ if (d < (D - 1))
+ {
+ r %= m_parent.m_totalsizes[d];
+ }
+
+ if (d > 0)
+ {
+ r /= m_parent.m_totalsizes[d - 1];
+ }
+
+ return r;
+ }
+
+ bool next_dim0()
+ {
+ m_pos++;
+
+ return !done();
+ }
+
+ bool next_dim1()
+ {
+ m_pos += m_parent.m_sizes[0] - dim(0);
+
+ return !done();
+ }
+
+ unsigned int dim0_max() const
+ {
+ unsigned int offset = std::min(m_end - m_pos, m_parent.m_sizes[0] - dim(0));
+
+ return dim(0) + offset;
+ }
+ };
+
+ void set_totalsizes()
+ {
+ unsigned int t = 1;
+
+ for (unsigned int i = 0; i < D; i++)
+ {
+ if (m_sizes[i] == 0)
+ {
+ m_sizes[i] = 1;
+ }
+
+ t *= m_sizes[i];
+
+ m_totalsizes[i] = t;
+ }
+ }
+
+public:
+ NDRange &operator=(const NDRange &rhs) = default;
+ NDRange(const NDRange &rhs) = default;
+
+ template <typename... T>
+ NDRange(T... ts) : m_sizes{ts...}
+ {
+ set_totalsizes();
+ }
+
+ NDRange(const std::array<unsigned int, D> &n) : m_sizes(n)
+ {
+ set_totalsizes();
+ }
+
+ NDRangeIterator iterator(unsigned int start, unsigned int end) const
+ {
+ return NDRangeIterator(*this, start, end);
+ }
+
+ unsigned int total_size() const
+ {
+ return m_totalsizes[D - 1];
+ }
+
+ unsigned int get_size(unsigned int v) const
+ {
+ return m_sizes[v];
+ }
+};
+
+/** NDCoordinate builds upon a range, but specifies a starting position
+ * in addition to a size which it inherits from NDRange
+ */
+template <unsigned int N>
+class NDCoordinate : public NDRange<N>
+{
+ using int_t = unsigned int;
+ using ndrange_t = NDRange<N>;
+
+ std::array<int_t, N> m_positions{};
+
+public:
+ NDCoordinate &operator=(const NDCoordinate &rhs) = default;
+ NDCoordinate(const NDCoordinate &rhs) = default;
+ NDCoordinate(const std::initializer_list<std::pair<int_t, int_t>> &list)
+ {
+ std::array<int_t, N> sizes{};
+
+ std::size_t i = 0;
+ for (auto &p : list)
+ {
+ m_positions[i] = p.first;
+ sizes[i++] = p.second;
+ }
+
+ //update the parents sizes
+ static_cast<ndrange_t &>(*this) = ndrange_t(sizes);
+ }
+
+ int_t get_position(int_t d) const
+ {
+ assert(d < N);
+
+ return m_positions[d];
+ }
+
+ void set_position(int_t d, int_t v)
+ {
+ assert(d < N);
+
+ m_positions[d] = v;
+ }
+
+ int_t get_position_end(int_t d) const
+ {
+ return get_position(d) + ndrange_t::get_size(d);
+ }
+}; //class NDCoordinate
+
+using ndrange_t = NDRange<6>;
+using ndcoord_t = NDCoordinate<6>;
+
+} // namespace arm_gemm