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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 Transposes a tile of 16b elements. Used by HGEMM to construct a K-strided layout in
+      shared memory for multiplicands.
+*/
+#pragma once
+
+#include <cuda_fp16.h>
+#include <cutlass/fragment.h>
+
+namespace cutlass {
+namespace gemm {
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template <typename GlobalIterator_>
+struct HgemmSwizzle {
+  /// The global iterator.
+  typedef GlobalIterator_ GlobalIterator;
+  /// The source fragment.
+  typedef typename GlobalIterator::Fragment Fragment;
+  /// The shape of the source fragment.
+  typedef typename GlobalIterator::FragmentShape FragmentShape;
+
+  /// The input fragment.
+  typedef Fragment InputFragment;
+  /// The output fragment.
+  typedef Fragment OutputFragment;
+
+  /// The src/dst must be half fragments.
+  static_assert((platform::is_same<typename Fragment::Element, half>::value), "Works on half");
+
+  /// The number of elements must be a multiple of 2.
+  static_assert(FragmentShape::kH == 2 && ShapeCount<FragmentShape>::kWc == 2, "Not multiple of 2");
+
+  /// Ctor.
+  CUTLASS_DEVICE HgemmSwizzle() {}
+
+  /// Transform a fragment.
+  CUTLASS_DEVICE void transform(Fragment const& src, Fragment& dst) {
+    // Expose src/dst as int arrays.
+    int const* src_int = reinterpret_cast<int const*>(&src[0]);
+    int* dst_int = reinterpret_cast<int*>(&dst[0]);
+
+    // Transpose the data.
+    for (int d = 0; d < FragmentShape::kD; ++d) {
+      // The indices to read two consecutive "rows".
+      int const i0 = 2 * d + 0;
+      int const i1 = 2 * d + 1;
+
+      int a0 = src_int[i0];
+      int a1 = src_int[i1];
+
+      int b0, b1;
+      asm volatile("prmt.b32 %0, %1, %2, 0x5410;" : "=r"(b0) : "r"(a0), "r"(a1));
+      asm volatile("prmt.b32 %0, %1, %2, 0x7632;" : "=r"(b1) : "r"(a0), "r"(a1));
+
+      // The indices to store with "strides".
+      int const j0 = 0 * (ShapeCount<FragmentShape>::kDhw / 2) + d;
+      int const j1 = 1 * (ShapeCount<FragmentShape>::kDhw / 2) + d;
+
+      dst_int[j0] = b0;
+      dst_int[j1] = b1;
+    }
+  }
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}  // namespace gemm
+}  // namespace cutlass