transpose.h

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namespace cutlass {
namespace transform {
namespace thread {

template <
  int ElementCount, 
  typename TransposeShape, 
  typename Element
> class Transpose;

template <int ElementCount_>
struct Transpose<ElementCount_, layout::PitchLinearShape<4,4> , int8_t> {

    static const int kElementCount = ElementCount_;
    using TransposeShape = layout::PitchLinearShape<4,4>;
    using Element = int8_t;
    using Fragment = cutlass::Array<Element, kElementCount>;

    static_assert(!(kElementCount % TransposeShape::kCount), "Shape needs to be multiple of 16 elements to do a 4x4 transpose");

    CUTLASS_DEVICE 
    void transform(Fragment& dst, Fragment& src) {

    // Expose src/dst as int arrays.
    int* src_int = reinterpret_cast<int*>(&src);
    int* dst_int = reinterpret_cast<int*>(&dst);

    CUTLASS_PRAGMA_UNROLL
    for (int i = 0; i < kElementCount / TransposeShape::kCount; i++){
  
      int const i0 = 4 * i + 0;
      int const i1 = 4 * i + 1;
      int const i2 = 4 * i + 2;
      int const i3 = 4 * i + 3;

      int a0 = src_int[i0];
      int a1 = src_int[i1];
      int a2 = src_int[i2];
      int a3 = src_int[i3];

      int b0, b1, b2, b3, c0;
      asm volatile("prmt.b32 %0, %1, %2, 0x0040;" : "=r"(b0) : "r"(a0), "r"(a1));
      asm volatile("prmt.b32 %0, %1, %2, 0x0040;" : "=r"(c0) : "r"(a2), "r"(a3));
      asm volatile("prmt.b32 %0, %1, %2, 0x5410;" : "=r"(b0) : "r"(b0), "r"(c0));

      asm volatile("prmt.b32 %0, %1, %2, 0x0051;" : "=r"(b1) : "r"(a0), "r"(a1));
      asm volatile("prmt.b32 %0, %1, %2, 0x0051;" : "=r"(c0) : "r"(a2), "r"(a3));
      asm volatile("prmt.b32 %0, %1, %2, 0x5410;" : "=r"(b1) : "r"(b1), "r"(c0));

      asm volatile("prmt.b32 %0, %1, %2, 0x0062;" : "=r"(b2) : "r"(a0), "r"(a1));
      asm volatile("prmt.b32 %0, %1, %2, 0x0062;" : "=r"(c0) : "r"(a2), "r"(a3));
      asm volatile("prmt.b32 %0, %1, %2, 0x5410;" : "=r"(b2) : "r"(b2), "r"(c0));

      asm volatile("prmt.b32 %0, %1, %2, 0x0073;" : "=r"(b3) : "r"(a0), "r"(a1));
      asm volatile("prmt.b32 %0, %1, %2, 0x0073;" : "=r"(c0) : "r"(a2), "r"(a3));
      asm volatile("prmt.b32 %0, %1, %2, 0x5410;" : "=r"(b3) : "r"(b3), "r"(c0));

      dst_int[i0] = b0;
      dst_int[i1] = b1;
      dst_int[i2] = b2;
      dst_int[i3] = b3;
    }
  }
};

}  // namespace thread
}  // namespace layout
}  // namespace cutlass