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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 constant expressions for mapping GEMM problem size and strides onto pitch-linear
+   memory.
+*/
+#pragma once
+
+#include <cutlass/matrix_traits.h>
+#include <cutlass/reshape_tile.h>
+#include <cutlass/util/platform.h>
+
+namespace cutlass {
+namespace gemm {
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+/// Helper to describe attributes of GEMM matrix operands
+template <GemmOperand::Kind kOperand_, MatrixLayout::Kind kLayout_>
+struct GemmOperandTraitsAb {
+  static const bool Congruous =
+      (kOperand_ == GemmOperand::kA ^ kLayout_ == MatrixLayout::kRowMajor);
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template <typename GemmOperand::Kind kOperand_, typename Tile_>
+struct GetExtent;
+
+template <typename Tile_>
+struct GetExtent<GemmOperand::kA, Tile_> {
+  static const int kExtent = Tile_::kW;
+};
+
+template <typename Tile_>
+struct GetExtent<GemmOperand::kB, Tile_> {
+  static const int kExtent = Tile_::kH;
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+/// Determines the shape of a multiplicand tile in terms of strided (H) and contiguous (W)
+/// dimensions
+template <typename ThreadBlockTile_, GemmOperand::Kind Usage, MatrixLayout::Kind Layout>
+struct GemmMultiplicandTraits {
+  // Only defined for A or B
+  static_assert(Usage == GemmOperand::kA || Usage == GemmOperand::kB,
+                "MultiplicandTileShape defined only for A or B operands.");
+
+  /// Shape of GEMM thread block tile (K, N, M)
+  typedef ThreadBlockTile_ ThreadBlockTile;
+
+  /// Identifies multiplicand
+  static GemmOperand::Kind const kUsage = Usage;
+
+  /// Layout of tile
+  static MatrixLayout::Kind const kLayout = Layout;
+
+  // True if K is the strided dimension
+  static bool const kKstrided = (kUsage == GemmOperand::kA ^ kLayout == MatrixLayout::kRowMajor);
+
+  /// Map the ThreadBlockShape onto (kH, kW) dimensions for A and B operand
+  typedef typename platform::conditional<
+      kKstrided,
+      Shape<1, ThreadBlockTile::kD, GetExtent<Usage, ThreadBlockTile>::kExtent>,
+      Shape<1, GetExtent<Usage, ThreadBlockTile>::kExtent, ThreadBlockTile::kD> >::type Shape;
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+/// Project's a coordinate (K, N, M) onto inner and outer dimensions defined for each
+/// operand.
+template <GemmOperand::Kind operand, bool Kstrided = true>
+struct ProjectOperand;
+
+/// Project A operand - (0, K, M)
+template <bool Kstrided>
+struct ProjectOperand<GemmOperand::kA, Kstrided> {
+  CUTLASS_HOST_DEVICE
+  static Coord<3> project(Coord<3> const &coord) {
+    if (Kstrided) {
+      return make_Coord(0, coord[0], coord[2]);
+    } else {
+      return make_Coord(0, coord[2], coord[0]);
+    }
+  }
+};
+
+/// Project B operand - (0, K, N)
+template <bool Kstrided>
+struct ProjectOperand<GemmOperand::kB, Kstrided> {
+  CUTLASS_HOST_DEVICE
+  static Coord<3> project(Coord<3> const &coord) {
+    if (Kstrided) {
+      return make_Coord(0, coord[0], coord[1]);
+    } else {
+      return make_Coord(0, coord[1], coord[0]);
+    }
+  }
+};
+
+/// Project C operand - (0, N, M)
+template <>
+struct ProjectOperand<GemmOperand::kC, true> {
+  CUTLASS_HOST_DEVICE
+  static Coord<3> project(Coord<3> const &coord) { return make_Coord(0, coord[1], coord[2]); }
+};
+
+/// Project D operand - (0, N, M)
+template <>
+struct ProjectOperand<GemmOperand::kD, true> {
+  CUTLASS_HOST_DEVICE
+  static Coord<3> project(Coord<3> const &coord) { return make_Coord(0, coord[1], coord[2]); }
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}  // namespace gemm
+}  // namespace cutlass