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 // SPDX-License-Identifier: MIT
 // Copyright (c) 2018-2025, Advanced Micro Devices, Inc. All rights reserved.
  
 #pragma once
  
 #include "ck/utility/common_header.hpp"
 #include "ck/tensor_description/tensor_adaptor.hpp"
 #include "ck/tensor_operation/gpu/thread/threadwise_tensor_slice_transfer.hpp"
 #include "ck/tensor_operation/gpu/warp/dpp_gemm.hpp"
  
 namespace ck {
  
 template <index_t BlockSize,
           typename ABDataType,
           typename AccDataType,
           typename AK0MK1BlockDesc,
           typename BK0NK1BlockDesc,
           index_t MPerDpp,
           index_t NPerDpp,
           index_t MRepeat,
           index_t NRepeat,
           index_t KPack>
 struct BlockwiseGemmDpp_ak0mak1_bk0nbk1_m0n0m1n1m2n2
 {
     static constexpr auto I0 = Number<0>{};
     static constexpr auto I1 = Number<1>{};
     static constexpr auto I2 = Number<2>{};
     static constexpr auto I3 = Number<3>{};
  
     using ThisThreadBlock = ThisThreadBlock<BlockSize>;
  
     static constexpr index_t MPerBlock = AK0MK1BlockDesc{}.GetLength(I1);
     static constexpr index_t NPerBlock = BK0NK1BlockDesc{}.GetLength(I1);
     static constexpr index_t KPerBlock =
         BK0NK1BlockDesc{}.GetLength(I0) * BK0NK1BlockDesc{}.GetLength(I2);
  
     static constexpr index_t MWaves   = MPerBlock / (MRepeat * MPerDpp);
     static constexpr index_t NWaves   = NPerBlock / (NRepeat * NPerDpp);
     static constexpr index_t WaveSize = BlockSize / MWaves / NWaves;
  
     static constexpr index_t A_K0 = AK0MK1BlockDesc{}.GetLength(I0);
     static constexpr index_t B_K0 = BK0NK1BlockDesc{}.GetLength(I0);
     static constexpr index_t A_K1 = AK0MK1BlockDesc{}.GetLength(I2);
     static constexpr index_t B_K1 = BK0NK1BlockDesc{}.GetLength(I2);
  
     static constexpr auto dpp_gemm = DppGemm<ABDataType, MPerDpp, NPerDpp, KPack>{};
  
     static constexpr index_t KPerThread = KPerBlock / dpp_gemm.K0PerDpp;
  
     StaticBufferTupleOfVector<AddressSpaceEnum::Vgpr,
                               AccDataType,
                               MRepeat * NRepeat,
                               dpp_gemm.GetRegSizePerDpp(),
                               true>
         c_thread_buf_;
  
     __host__ __device__ constexpr auto& GetCThreadBuffer() { return c_thread_buf_; }
  
     __device__ static auto GetWaveIdx()
     {
         const index_t thread_id = ThisThreadBlock::GetThreadId();
  
         constexpr auto threadid_to_wave_idx_adaptor = make_single_stage_tensor_adaptor(
             make_tuple(make_merge_transform(make_tuple(MWaves, NWaves, WaveSize))),
             make_tuple(Sequence<0, 1, 2>{}),
             make_tuple(Sequence<0>{}));
  
         return threadid_to_wave_idx_adaptor.CalculateBottomIndex(make_multi_index(thread_id));
     }
  
     __device__ static auto CalculateAThreadOriginDataIndex_M0_M1_M2_K()
     {
         const auto wave_idx    = GetWaveIdx();
         const auto waveId_m    = wave_idx[I0];
         const auto dpp_a_idx   = dpp_gemm.CalculateAThreadOriginDataIndex_K_M();
         const auto dpp_a_idx_k = dpp_a_idx[I0];
         const auto dpp_a_idx_m = dpp_a_idx[I1];
         return make_tuple(0, waveId_m, dpp_a_idx_m, KPerThread * dpp_a_idx_k);
     }
  
     __device__ static auto CalculateBThreadOriginDataIndex_N0_N1_N2_K()
     {
         const auto wave_idx    = GetWaveIdx();
         const auto waveId_n    = wave_idx[I1];
         const auto dpp_b_idx   = dpp_gemm.CalculateBThreadOriginDataIndex_K_N();
         const auto dpp_b_idx_k = dpp_b_idx[I0];
         const auto dpp_b_idx_n = dpp_b_idx[I1];
         return make_tuple(0, waveId_n, dpp_b_idx_n, KPerThread * dpp_b_idx_k);
     }
  
     template <index_t m0, index_t n0>
     __device__ static auto CalculateCThreadOriginDataIndex(Number<m0>, Number<n0>)
     {
         const auto wave_idx = GetWaveIdx();
         const auto waveId_m = wave_idx[I0];
         const auto waveId_n = wave_idx[I1];
  
         const auto blk_idx      = dpp_gemm.GetBeginOfThreadBlk();
         const auto blk_m_offset = blk_idx[I0];
         const auto blk_n_offset = blk_idx[I1];
  
         constexpr auto mrepeat_mwave_MPerDpp_to_m_adaptor = make_single_stage_tensor_adaptor(
             make_tuple(make_unmerge_transform(make_tuple(MRepeat, MWaves, MPerDpp))),
             make_tuple(Sequence<0>{}),
             make_tuple(Sequence<0, 1, 2>{}));
  
         constexpr auto nrepeat_nwave_NPerDpp_to_n_adaptor = make_single_stage_tensor_adaptor(
             make_tuple(make_unmerge_transform(make_tuple(NRepeat, NWaves, NPerDpp))),
             make_tuple(Sequence<0>{}),
             make_tuple(Sequence<0, 1, 2>{}));
  
         const index_t c_thread_m = mrepeat_mwave_MPerDpp_to_m_adaptor.CalculateBottomIndex(
             make_tuple(m0, waveId_m, blk_m_offset))[I0];
         const index_t c_thread_n = nrepeat_nwave_NPerDpp_to_n_adaptor.CalculateBottomIndex(
             make_tuple(n0, waveId_n, blk_n_offset))[I0];
  
         return make_tuple(c_thread_m, c_thread_n);
     }
  
     __host__ __device__ BlockwiseGemmDpp_ak0mak1_bk0nbk1_m0n0m1n1m2n2()
     {
         static_assert(AK0MK1BlockDesc::IsKnownAtCompileTime() &&
                           BK0NK1BlockDesc::IsKnownAtCompileTime(),
                       "Wrong! Block descriptors should be known at the time of compilation.");
  
 #if defined(__HIP_DEVICE_COMPILE__)
         // Host wave size can be different than the device one and this assert could fail for host,
         // but it does matter only for device.
         static_assert(ThisThreadBlock::GetNumOfThread() == MWaves * NWaves * WaveSize,
                       "ThisThreadBlock::GetNumOfThread() != MWaves * NWaves * WaveSize\n");
 #endif
  
         static_assert(MPerBlock % (MPerDpp * MRepeat) == 0,
                       "Invalid parameters. MPerBlock must be divisible by MPerDpp * MRepeat.");
         static_assert(NPerBlock % (NPerDpp * NRepeat) == 0,
                       "Invalid parameters. NPerBlock must be divisible by NPerDpp * NRepeat.");
     }
  
     __host__ __device__ static constexpr auto GetCThreadDescriptor_M0_N0_M1_N1_M2_N2()
     {
         constexpr auto c_m_n_tblk_lens = dpp_gemm.GetCMNThreadBlkLengths();
         constexpr auto M               = c_m_n_tblk_lens[I0];
         constexpr auto N               = c_m_n_tblk_lens[I1];
  
         return make_naive_tensor_descriptor_packed(
             make_tuple(Number<MRepeat>{}, Number<NRepeat>{}, I1, I1, M, N));
     }
  
     __host__ __device__ static constexpr auto GetCThreadDescriptor_G_M0_N0_M1_N1_M2_N2()
     {
         constexpr auto c_m_n_tblk_lens = dpp_gemm.GetCMNThreadBlkLengths();
         constexpr auto M               = c_m_n_tblk_lens[I0];
         constexpr auto N               = c_m_n_tblk_lens[I1];
  
         return make_naive_tensor_descriptor_packed(
             make_tuple(I1, Number<MRepeat>{}, Number<NRepeat>{}, I1, I1, M, N));
     }
  
     __host__ __device__ static constexpr auto GetCBlockDescriptor_M0_N0_M1_N1_M2_N2()
     {
         constexpr auto c_block_desc_m0_n0_m1_n1_m2_n2 =
             make_naive_tensor_descriptor_packed(make_tuple(Number<MRepeat>{},
                                                            Number<NRepeat>{},
                                                            Number<MWaves>{},
                                                            Number<NWaves>{},
                                                            Number<MPerDpp>{},
                                                            Number<NPerDpp>{}));
  
         return c_block_desc_m0_n0_m1_n1_m2_n2;
     }
  
     __host__ __device__ static constexpr auto GetCBlockDescriptor_G_M0_N0_M1_N1_M2_N2()
     {
         constexpr auto c_block_desc_g_m0_n0_m1_n1_m2_n2 =
             make_naive_tensor_descriptor_packed(make_tuple(I1,
                                                            Number<MRepeat>{},
                                                            Number<NRepeat>{},
                                                            Number<MWaves>{},
                                                            Number<NWaves>{},
                                                            Number<MPerDpp>{},
                                                            Number<NPerDpp>{}));
         return c_block_desc_g_m0_n0_m1_n1_m2_n2;
     }
  
     template <typename CGridDesc_M_N>
     __host__ __device__ static constexpr auto
     MakeCGridDescriptor_M0_N0_M1_N1_M2_N2(const CGridDesc_M_N& c_grid_desc_m_n)
     {
         const auto M = c_grid_desc_m_n.GetLength(I0);
         const auto N = c_grid_desc_m_n.GetLength(I1);
  
         const auto c_grid_desc_m0_n0_m1_n1_m2_n2 = transform_tensor_descriptor(
             c_grid_desc_m_n,
             make_tuple(make_unmerge_transform(make_tuple(M / (MWaves * MPerDpp), MWaves, MPerDpp)),
                        make_unmerge_transform(make_tuple(N / (NWaves * NPerDpp), NWaves, NPerDpp))),
             make_tuple(Sequence<0>{}, Sequence<1>{}),
             make_tuple(Sequence<0, 2, 4>{}, Sequence<1, 3, 5>{}));
  
         return c_grid_desc_m0_n0_m1_n1_m2_n2;
     }
  
     template <typename CGridDesc_G_M_N>
     __host__ __device__ static constexpr auto
     MakeCGridDescriptor_G_M0_N0_M1_N1_M2_N2(const CGridDesc_G_M_N& c_grid_desc_g_m_n)
     {
         const auto G = c_grid_desc_g_m_n.GetLength(I0);
         const auto M = c_grid_desc_g_m_n.GetLength(I1);
         const auto N = c_grid_desc_g_m_n.GetLength(I2);
  
         const auto c_grid_desc_g_m0_n0_m1_n1_m2_n2 = transform_tensor_descriptor(
             c_grid_desc_g_m_n,
             make_tuple(make_pass_through_transform(G),
                        make_unmerge_transform(make_tuple(M / (MWaves * MPerDpp), MWaves, MPerDpp)),
                        make_unmerge_transform(make_tuple(N / (NWaves * NPerDpp), NWaves, NPerDpp))),
             make_tuple(Sequence<0>{}, Sequence<1>{}, Sequence<2>{}),
             make_tuple(Sequence<0>{}, Sequence<1, 3, 5>{}, Sequence<2, 4, 6>{}));
  
         return c_grid_desc_g_m0_n0_m1_n1_m2_n2;
     }
  
     __host__ __device__ static constexpr auto MakeABlockDescriptor_M0_M1_M2_K()
     {
         return transform_tensor_descriptor(
             AK0MK1BlockDesc{},
             make_tuple(
                 make_merge_transform_v3_division_mod(make_tuple(Number<A_K0>{}, Number<A_K1>{})),
                 make_unmerge_transform(
                     make_tuple(Number<MRepeat>{}, Number<MWaves>{}, Number<MPerDpp>{}))),
             make_tuple(Sequence<0, 2>{}, Sequence<1>{}),
             make_tuple(Sequence<3>{}, Sequence<0, 1, 2>{}));
     }
  
     __host__ __device__ static constexpr auto MakeBBlockDescriptor_N0_N1_N2_K()
     {
         return transform_tensor_descriptor(
             BK0NK1BlockDesc{},
             make_tuple(
                 make_merge_transform_v3_division_mod(make_tuple(Number<B_K0>{}, Number<B_K1>{})),
                 make_unmerge_transform(
                     make_tuple(Number<NRepeat>{}, Number<NWaves>{}, Number<NPerDpp>{}))),
             make_tuple(Sequence<0, 2>{}, Sequence<1>{}),
             make_tuple(Sequence<3>{}, Sequence<0, 1, 2>{}));
     }
  
     static constexpr auto a_block_desc_m0_m1_m2_k = MakeABlockDescriptor_M0_M1_M2_K();
     static constexpr auto b_block_desc_n0_n1_n2_k = MakeBBlockDescriptor_N0_N1_N2_K();
  
     template <typename ABlockBuffer, typename BBlockBuffer, typename CThreadBuffer>
     __device__ void Run(const ABlockBuffer& a_block_buf,
                         const BBlockBuffer& b_block_buf,
                         CThreadBuffer& c_thread_buf) const
     {
         auto a_thread_buf = make_static_buffer<AddressSpaceEnum::Vgpr, ABDataType>(
             a_thread_desc_.GetElementSpaceSize());
         auto b_thread_buf = make_static_buffer<AddressSpaceEnum::Vgpr, ABDataType>(
             b_thread_desc_.GetElementSpaceSize());
  
         static_for<0, MRepeat, 1>{}([&](auto m0) {
             // read A
             a_thread_copy_.Run(a_block_desc_m0_m1_m2_k,
                                make_tuple(m0, I0, I0, I0),
                                a_block_buf,
                                a_thread_desc_,
                                make_tuple(I0, I0, I0, I0),
                                a_thread_buf);
  
             static_for<0, NRepeat, 1>{}([&](auto n0) {
                 // read B
                 b_thread_copy_.Run(b_block_desc_n0_n1_n2_k,
                                    make_tuple(n0, I0, I0, I0),
                                    b_block_buf,
                                    b_thread_desc_,
                                    make_tuple(I0, I0, I0, I0),
                                    b_thread_buf);
  
                 static_for<0, KPerThread, KPack>{}([&](auto k) {
                     vector_type<ABDataType, KPack> a_thread_vec;
                     vector_type<ABDataType, KPack> b_thread_vec;
  
                     static_for<0, KPack, 1>{}([&](auto i) {
                         a_thread_vec.template AsType<ABDataType>()(i) = a_thread_buf
                             [Number<a_thread_desc_.CalculateOffset(make_tuple(0, 0, 0, k + i))>{}];
                         b_thread_vec.template AsType<ABDataType>()(i) = b_thread_buf
                             [Number<b_thread_desc_.CalculateOffset(make_tuple(0, 0, 0, k + i))>{}];
                     });
  
                     using dpp_input_type =
                         typename vector_type<ABDataType, dpp_gemm.K1PerDpp>::type;
  
                     constexpr index_t c_offset =
                         c_thread_desc_.CalculateOffset(make_tuple(m0, n0, 0));
  
                     dpp_gemm.Run(a_thread_vec.template AsType<dpp_input_type>(),
                                  b_thread_vec.template AsType<dpp_input_type>(),
                                  c_thread_buf.GetVectorTypeReference(Number<c_offset>{}));
                 });
             });
         });
     }
  
     protected:
     // A[M0, M1, M2, KPerThread]
     static constexpr auto a_thread_desc_ =
         make_naive_tensor_descriptor_packed(make_tuple(I1, I1, I1, Number<KPerThread>{}));
  
     // B[N0, N1, N2, KPerThread]
     static constexpr auto b_thread_desc_ =
         make_naive_tensor_descriptor_packed(make_tuple(I1, I1, I1, Number<KPerThread>{}));
  
     // C[M, N, NumRegDpp]
     static constexpr auto c_thread_desc_ = make_naive_tensor_descriptor_packed(
         make_tuple(Number<MRepeat>{}, Number<NRepeat>{}, dpp_gemm.GetRegSizePerDpp()));
  
     using AThreadCopy = ThreadwiseTensorSliceTransfer_v4<ABDataType,
                                                          ABDataType,
                                                          decltype(a_block_desc_m0_m1_m2_k),
                                                          decltype(a_thread_desc_),
                                                          Sequence<1, 1, 1, KPerThread>,
                                                          Sequence<0, 1, 2, 3>,
                                                          3,
                                                          A_K1,
                                                          A_K1>;
  
     using BThreadCopy = ThreadwiseTensorSliceTransfer_v4<ABDataType,
                                                          ABDataType,
                                                          decltype(b_block_desc_n0_n1_n2_k),
                                                          decltype(b_thread_desc_),
                                                          Sequence<1, 1, 1, KPerThread>,
                                                          Sequence<0, 1, 2, 3>,
                                                          3,
                                                          B_K1,
                                                          B_K1>;
  
     AThreadCopy a_thread_copy_{CalculateAThreadOriginDataIndex_M0_M1_M2_K()};
     BThreadCopy b_thread_copy_{CalculateBThreadOriginDataIndex_N0_N1_N2_K()};
 };
  
 } // namespace ck