// SPDX-License-Identifier: MIT
// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.

#pragma once

#include "ck/utility/common_header.hpp"
#include "ck/tensor_description/multi_index_transform_helper.hpp"
#include "ck/tensor_description/tensor_descriptor.hpp"
#include "ck/tensor_description/tensor_descriptor_helper.hpp"
#include "ck/tensor_operation/gpu/grid/block_to_ctile_map.hpp"
#include "ck/tensor_operation/gpu/grid/gridwise_gemm_pipeline_selector.hpp"
#include "ck/tensor_operation/gpu/block/blockwise_gemm_wmma.hpp"
#include "ck/tensor_operation/gpu/block/thread_group_tensor_slice_transfer_v4r1.hpp"
#include "ck/tensor_operation/gpu/block/thread_group_tensor_slice_transfer_v6r1.hpp"
#include "ck/tensor_operation/gpu/thread/threadwise_tensor_slice_transfer.hpp"
#include "ck/tensor_operation/gpu/element/element_wise_operation.hpp"
#include "ck/tensor_operation/gpu/block/blockwise_softmax.hpp"

namespace ck {

template <typename GridwiseGemm,
          typename FloatA,
          typename FloatB0,
          typename FloatB1,
          typename FloatC,
          typename AGridDesc_AK0_M_AK1,
          typename B0GridDesc_BK0_L_BK1,
          typename B1GridDesc_BL0_N_BL1,
          typename CGridDescriptor_MBlock_MPerBlock_NBlock_NPerBlock,
          typename AElementwiseOperation,
          typename B0ElementwiseOperation,
          typename AccElementwiseOperation,
          typename B1ElementwiseOperation,
          typename CElementwiseOperation,
          typename ComputeBasePtrOfStridedBatch,
          typename C0MatrixMask,
          typename Block2CTileMap,
          bool HasMainKBlockLoop>
__global__ void
#if CK_USE_LAUNCH_BOUNDS
    __launch_bounds__(CK_MAX_THREAD_PER_BLOCK, CK_MIN_BLOCK_PER_CU)
#endif
        kernel_batched_gemm_softmax_gemm_wmma_cshuffle(
            const FloatA* __restrict__ p_a_grid,
            const FloatB0* __restrict__ p_b0_grid,
            const FloatB1* __restrict__ p_b1_grid,
            FloatC* __restrict__ p_c_grid,
            const AGridDesc_AK0_M_AK1 a_grid_desc_ak0_m_ak1,
            const B0GridDesc_BK0_L_BK1 b0_grid_desc_bk0_l_bk1,
            const B1GridDesc_BL0_N_BL1 b1_grid_desc_l0_n_l1,
            const CGridDescriptor_MBlock_MPerBlock_NBlock_NPerBlock
                c_grid_desc_mblock_mperblock_nblock_nperblock,
            const AElementwiseOperation a_element_op,
            const B0ElementwiseOperation b0_element_op,
            const AccElementwiseOperation acc_element_op,
            const B1ElementwiseOperation b1_element_op,
            const CElementwiseOperation c_element_op,
            const index_t batch_count,
            const ComputeBasePtrOfStridedBatch compute_base_ptr_of_batch,
            const C0MatrixMask c0_matrix_mask,
            const Block2CTileMap block_2_ctile_map)
{
#if(!defined(__HIP_DEVICE_COMPILE__) || defined(__gfx1100__))
    __shared__ char p_shared[GridwiseGemm::GetSharedMemoryNumberOfByte()];

    const index_t num_blocks_per_batch =
        __builtin_amdgcn_readfirstlane(get_grid_size() / batch_count);
    const index_t g_idx = __builtin_amdgcn_readfirstlane(get_block_1d_id() / num_blocks_per_batch);

    const long_index_t a_batch_offset = __builtin_amdgcn_readfirstlane(
        static_cast<long_index_t>(compute_base_ptr_of_batch.GetABasePtr(g_idx)));
    const long_index_t b0_batch_offset = __builtin_amdgcn_readfirstlane(
        static_cast<long_index_t>(compute_base_ptr_of_batch.GetB0BasePtr(g_idx)));
    const long_index_t b1_batch_offset = __builtin_amdgcn_readfirstlane(
        static_cast<long_index_t>(compute_base_ptr_of_batch.GetB1BasePtr(g_idx)));
    const long_index_t c_batch_offset = __builtin_amdgcn_readfirstlane(
        static_cast<long_index_t>(compute_base_ptr_of_batch.GetCBasePtr(g_idx)));

    GridwiseGemm::template Run<HasMainKBlockLoop>(p_a_grid + a_batch_offset,
                                                  p_b0_grid + b0_batch_offset,
                                                  p_b1_grid + b1_batch_offset,
                                                  p_c_grid + c_batch_offset,
                                                  p_shared,
                                                  a_grid_desc_ak0_m_ak1,
                                                  b0_grid_desc_bk0_l_bk1,
                                                  b1_grid_desc_l0_n_l1,
                                                  c_grid_desc_mblock_mperblock_nblock_nperblock,
                                                  a_element_op,
                                                  b0_element_op,
                                                  acc_element_op,
                                                  b1_element_op,
                                                  c_element_op,
                                                  c0_matrix_mask,
                                                  block_2_ctile_map);
#else
    ignore = p_a_grid;
    ignore = p_b0_grid;
    ignore = p_b1_grid;
    ignore = p_c_grid;
    ignore = a_grid_desc_ak0_m_ak1;
    ignore = b0_grid_desc_bk0_l_bk1;
    ignore = b1_grid_desc_l0_n_l1;
    ignore = c_grid_desc_mblock_mperblock_nblock_nperblock;
    ignore = a_element_op;
    ignore = b0_element_op;
    ignore = acc_element_op;
    ignore = b1_element_op;
    ignore = c_element_op;
    ignore = batch_count;
    ignore = compute_base_ptr_of_batch;
    ignore = c0_matrix_mask;
    ignore = block_2_ctile_map;
#endif // end of if (defined(__gfx1100__))
}

// Gemm0: A [M x K] x B0 [K x L] = Acc [M x L]
// Gemm1: Acc [M x L] x B1 [L x N] = C [M x N]
template <typename FloatA,
          typename FloatB0,
          typename FloatAcc0,
          typename FloatB1,
          typename FloatAcc1,
          typename FloatCShuffle,
          typename FloatC,
          typename AElementwiseOperation,
          typename B0ElementwiseOperation,
          typename AccElementwiseOperation,
          typename B1ElementwiseOperation,
          typename CElementwiseOperation,
          InMemoryDataOperationEnum CGlobalMemoryDataOperation,
          typename AGridDesc_AK0_M_AK1,
          typename B0GridDesc_BK0_L_BK1,
          typename B1GridDesc_BL0_N_BL1,
          typename CGridDesc_M_N,
          index_t MPerBlock,
          index_t LPerBlock,
          index_t K0PerBlock, // K0 * K1Value = Gemm0 GEMM_K Dim
          index_t K1Value,    
          index_t NPerBlock,
          index_t L0PerBlock,
          index_t L1Value,   
          index_t MPerWmma,
          index_t LPerWmma,
          index_t NPerWmma,
          index_t MRepeat,
          index_t LRepeat,
          index_t NRepeat,
          index_t BlockSize,
          typename ABlockTransferThreadClusterLengths_K0_M_K1,
          typename ABlockTransferThreadClusterArrangeOrder,
          typename ABlockTransferSrcAccessOrder,
          index_t ABlockTransferSrcVectorDim,
          index_t ABlockTransferSrcScalarPerVector,
          index_t ABlockTransferDstScalarPerVector_K1,
          bool AThreadTransferSrcResetCoordinateAfterRun,
          bool ABlockLdsExtraM,
          typename B0BlockTransferThreadClusterLengths_K0_L_K1,
          typename B0BlockTransferThreadClusterArrangeOrder,
          typename B0BlockTransferSrcAccessOrder,
          index_t B0BlockTransferSrcVectorDim,
          index_t B0BlockTransferSrcScalarPerVector,
          index_t B0BlockTransferDstScalarPerVector_K1,
          bool B0ThreadTransferSrcResetCoordinateAfterRun,
          bool B0BlockLdsExtraN,
          typename B1BlockTransferThreadClusterLengths_L0_N_L1,
          typename B1BlockTransferThreadClusterArrangeOrder,
          typename B1BlockTransferSrcAccessOrder,
          index_t B1BlockTransferSrcVectorDim,
          index_t B1BlockTransferSrcScalarPerVector,
          index_t B1BlockTransferDstScalarPerVector_L1,
          bool B1ThreadTransferSrcResetCoordinateAfterRun,
          bool B1BlockLdsExtraN,
          index_t CShuffleMRepeatPerShuffle,
          index_t CShuffleNRepeatPerShuffle,
          typename CShuffleBlockTransferClusterLengths_MBlock_MPerBlock_NBlock_NPerBlock,
          index_t CShuffleBlockTransferScalarPerVector_NPerBlock,
          bool PadN,
          bool MaskOutUpperTriangle,
          index_t NumGemmKPrefetchStage = 1,
          LoopScheduler LoopSched       = make_default_loop_scheduler(),
          PipelineVersion PipelineVer   = PipelineVersion::v1>
struct GridwiseBatchedGemmSoftmaxGemm_Wmma_CShuffle
{
    static constexpr auto I0 = Number<0>{};
    static constexpr auto I1 = Number<1>{};
    static constexpr auto I2 = Number<2>{};
    static constexpr auto I3 = Number<3>{};
    static constexpr auto I4 = Number<4>{};
    static constexpr auto I5 = Number<5>{};
    static constexpr auto I6 = Number<6>{};
    static constexpr auto I7 = Number<7>{};

    static constexpr auto AK0 = Number<K0PerBlock>{};
    static constexpr auto AK1 = Number<K1Value>{};
    static constexpr auto BK0 = Number<K0PerBlock>{};
    static constexpr auto BK1 = Number<K1Value>{};

    static constexpr auto AL0 = Number<L0PerBlock / 2>{};
    static constexpr auto AL1 = Number<L1Value>{};
    static constexpr auto BL0 = Number<L0PerBlock>{};
    static constexpr auto BL1 = Number<L1Value>{};

    using ThisThreadBlock = ThisThreadBlock<BlockSize>;

    using GridwiseGemmPipe = remove_cvref_t<decltype(
        GridwiseGemmPipeline_Selector<PipelineVer, NumGemmKPrefetchStage, LoopSched>())>;

    template <typename A0BlockDesc_AK0_M_AK1>
    __host__ __device__ static constexpr auto
    MakeA0BlockDescriptor_K0_M0_M1_M2_K1(const A0BlockDesc_AK0_M_AK1&)
    {
        constexpr index_t A_K0 = A0BlockDesc_AK0_M_AK1{}.GetLength(I0);
        constexpr index_t A_K1 = A0BlockDesc_AK0_M_AK1{}.GetLength(I2);
        constexpr index_t MWaves = MPerBlock / (MRepeat * MPerWmma);

        return transform_tensor_descriptor(
            A0BlockDesc_AK0_M_AK1{},
            make_tuple(make_pass_through_transform(Number<A_K0>{}),
                       make_unmerge_transform(
                           make_tuple(Number<MRepeat>{}, Number<MWaves>{}, Number<MPerWmma>{})),
                       make_pass_through_transform(Number<A_K1>{})),
            make_tuple(Sequence<0>{}, Sequence<1>{}, Sequence<2>{}),
            make_tuple(Sequence<0>{}, Sequence<1, 2, 3>{}, Sequence<4>{}));
    }

    template <typename B0BlockDesc_BK0_L_BK1>
    __host__ __device__ static constexpr auto
    MakeB0BlockDescriptor_K0_L0_L1_L2_K1(const B0BlockDesc_BK0_L_BK1&)
    {
        constexpr index_t B_K0 = B0BlockDesc_BK0_L_BK1{}.GetLength(I0);
        constexpr index_t B_K1 = B0BlockDesc_BK0_L_BK1{}.GetLength(I2);
        constexpr index_t LWaves = LPerBlock / (LRepeat * LPerWmma);
        return transform_tensor_descriptor(
            B0BlockDesc_BK0_L_BK1{},
            make_tuple(make_pass_through_transform(Number<B_K0>{}),
                       make_unmerge_transform(
                           make_tuple(Number<LRepeat>{}, Number<LWaves>{}, Number<LPerWmma>{})),
                       make_pass_through_transform(Number<B_K1>{})),
            make_tuple(Sequence<0>{}, Sequence<1>{}, Sequence<2>{}),
            make_tuple(Sequence<0>{}, Sequence<1, 2, 3>{}, Sequence<4>{}));
    }

    template <typename A1BlockDesc_AL0_M_AL1>
    __host__ __device__ static constexpr auto
    MakeA1BlockDescriptor_L0_M0_M1_M2_L1(const A1BlockDesc_AL0_M_AL1&)
    {
        constexpr index_t A_L0 = A1BlockDesc_AL0_M_AL1{}.GetLength(I0);
        constexpr index_t A_L1 = A1BlockDesc_AL0_M_AL1{}.GetLength(I2);

        return transform_tensor_descriptor(
            A1BlockDesc_AL0_M_AL1{},
            make_tuple(make_pass_through_transform(Number<A_L0>{}),
                       make_unmerge_transform(
                           make_tuple(Number<MRepeat>{}, I1, I1)),
                       make_pass_through_transform(Number<A_L1>{})),
            make_tuple(Sequence<0>{}, Sequence<1>{}, Sequence<2>{}),
            make_tuple(Sequence<0>{}, Sequence<1, 2, 3>{}, Sequence<4>{}));
    }

    template <typename B1BlockDesc_BL0_N_BL1>
    __host__ __device__ static constexpr auto MakeB1BlockDescriptor_L0_N0_N1_N2_L1(const B1BlockDesc_BL0_N_BL1&)
    {
        constexpr index_t B_K0 = B1BlockDesc_BL0_N_BL1{}.GetLength(I0);
        constexpr index_t B_K1 = B1BlockDesc_BL0_N_BL1{}.GetLength(I2);
        constexpr index_t NWaves = NPerBlock / (NRepeat * NPerWmma);
        return transform_tensor_descriptor(
            B1BlockDesc_BL0_N_BL1{},
            make_tuple(make_pass_through_transform(Number<B_K0>{}),
                       make_unmerge_transform(
                           make_tuple(Number<NRepeat>{}, Number<NWaves>{}, Number<NPerWmma>{})),
                       make_pass_through_transform(Number<B_K1>{})),
            make_tuple(Sequence<0>{}, Sequence<1>{}, Sequence<2>{}),
            make_tuple(Sequence<0>{}, Sequence<1, 2, 3>{}, Sequence<4>{}));
    }

    __host__ __device__ static constexpr auto GetABlockDescriptor_AK0PerBlock_MPerBlock_AK1()
    {
        // A matrix in LDS memory, dst of blockwise copy
        return make_naive_tensor_descriptor(
            make_tuple(AK0, Number<MPerBlock>{}, AK1),
            make_tuple(Number<MPerBlock + ABlockLdsExtraM>{} * AK1, AK1, I1));
    }

    __host__ __device__ static constexpr auto GetB0BlockDescriptor_BK0PerBlock_LPerBlock_BK1()
    {
        // B matrix in LDS memory, dst of blockwise copy
        return make_naive_tensor_descriptor(
            make_tuple(BK0, Number<LPerBlock>{}, BK1),
            make_tuple(Number<LPerBlock + B0BlockLdsExtraN>{} * BK1, BK1, I1));
    }

    __host__ __device__ static constexpr auto GetB1BlockDescriptor_BL0PerBlock_NPerBlock_BL1()
    {
        // B1 matrix in LDS memory, dst of blockwise copy
        return make_naive_tensor_descriptor(
            make_tuple(BL0, Number<NPerBlock>{}, BL1),
            make_tuple(Number<NPerBlock + B1BlockLdsExtraN>{} * BL1, BL1, I1));
    }

    __host__ __device__ static constexpr auto
    // *Caution Here repeat is shuffle repeat
    GetCShuffleBlockDescriptor_MShRepeat_MPerShRepeat_NShRepeat_NPerShRepeat()
    {
        constexpr index_t MWave = MPerBlock / (MRepeat * MPerWmma);
        constexpr index_t NWave = NPerBlock / (NRepeat * NPerWmma);

        constexpr auto c_shuffle_block_desc_mshrepeat_mpershrepeat_nshrepeat_npershrepeat =
            make_naive_tensor_descriptor_packed(
                make_tuple(I1,
                           Number<CShuffleMRepeatPerShuffle * MWave * MPerWmma>{},
                           I1,
                           Number<CShuffleNRepeatPerShuffle * NWave * NPerWmma>{}));

        return c_shuffle_block_desc_mshrepeat_mpershrepeat_nshrepeat_npershrepeat;
    }

    __host__ __device__ static constexpr index_t GetSharedMemoryNumberOfByte()
    {
        // LDS allocation for A and B: be careful of alignment
        const index_t gemm0_bytes_end = (SharedMemTrait::a_block_space_size_aligned * sizeof(FloatA) +
                                         SharedMemTrait::b0_block_space_size_aligned * sizeof(FloatB0));

        const index_t gemm1_bytes_end =
                    (SharedMemTrait::b1_block_space_offset + SharedMemTrait::b1_block_space_size_aligned) *
                    sizeof(FloatB1);
        
        const index_t softmax_bytes_end = (SharedMemTrait::reduction_space_offset +
                                           SharedMemTrait::reduction_space_size_aligned) *
                                          sizeof(FloatAcc0);
        
        const index_t c_block_bytes_end =
            SharedMemTrait::c_block_space_size * sizeof(FloatCShuffle);

        return math::max(gemm0_bytes_end, gemm1_bytes_end, softmax_bytes_end, c_block_bytes_end);
    }

    // block_id to matrix tile idx (m0, n0) mapping are controlled by {M01, N01}
    template <typename Block2CTileMap>
    __host__ __device__ static constexpr bool
    CheckValidity(const AGridDesc_AK0_M_AK1& a_grid_desc_ak0_m_ak1,
                  const B0GridDesc_BK0_L_BK1& b0_grid_desc_bk0_l_bk1,
                  const B1GridDesc_BL0_N_BL1& b1_grid_desc_l0_n_l1,
                  const CGridDesc_M_N& c_grid_desc_m_n,
                  const Block2CTileMap& block_2_ctile_map)
    {
        static_assert((MPerBlock % (MPerWmma * MRepeat) == 0) &&
                          (LPerBlock % (LPerWmma * LRepeat)) == 0,
                      "Invalid tuning param!");

        const auto M = a_grid_desc_ak0_m_ak1.GetLength(I1);
        const auto L = b0_grid_desc_bk0_l_bk1.GetLength(I1);
        const auto K = a_grid_desc_ak0_m_ak1.GetLength(I0) * a_grid_desc_ak0_m_ak1.GetLength(I2);
        const auto N = b1_grid_desc_l0_n_l1.GetLength(I1);

        printf("M = %d, L = %d, K = %d, N = %d\n", M, L, K, N);

        const auto KPerBlock = K0PerBlock * K1Value;
        if(!(M == c_grid_desc_m_n.GetLength(I0) && N == c_grid_desc_m_n.GetLength(I1)))
        {
            return false;
        }

        if(!(M % MPerBlock == 0 && L % LPerBlock == 0 && K % KPerBlock == 0 &&
             N % NPerBlock == 0))
        {
            return false;
        }

        // check gemm0 gridwise gemm pipeline
        const auto num_gemm0_k_loop = K / KPerBlock;
        if(!GridwiseGemmPipe::IsSupported(num_gemm0_k_loop))
        {
            return false;
        }

        // check gemm1 gridwise gemm pipeline
        if(!(LPerBlock % (L0PerBlock * L1Value) == 0))
        {
            return false;
        }

        const auto num_gemm1_k_inner_loop = LPerBlock / (L0PerBlock * L1Value);
        if(!GridwiseGemmPipe::IsSupported(num_gemm1_k_inner_loop))
        {
            return false;
        }

        if(!block_2_ctile_map.CheckValidity(c_grid_desc_m_n))
        {
            return false;
        }

        // TODO: also check validity of all components (blockwise-copy, threadwise-copy, etc)
        return true;
    }

    __host__ __device__ static constexpr bool CalculateHasMainKBlockLoop(index_t K)
    {
        const index_t num_loop = K / (K0PerBlock * K1Value);

        return GridwiseGemmPipe::CalculateHasMainLoop(num_loop);
    }

    __host__ __device__ static constexpr auto
    MakeCGridDescriptor_MBlock_MPerBlock_NBlock_NPerBlock(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 MBlock = M / MPerBlock;
        const auto NBlock = N / NPerBlock;

        const auto c_grid_desc_mblock_mperblock_nblock_nperblock = transform_tensor_descriptor(
            c_grid_desc_m_n,
            make_tuple(make_unmerge_transform(make_tuple(MBlock, Number<MPerBlock>{})),
                       make_unmerge_transform(make_tuple(NBlock, Number<NPerBlock>{}))),
            make_tuple(Sequence<0>{}, Sequence<1>{}),
            make_tuple(Sequence<0, 1>{}, Sequence<2, 3>{}));

        return c_grid_desc_mblock_mperblock_nblock_nperblock;
    }

    // return block_id to C matrix tile idx (m0, n0) mapping
    __host__ __device__ static constexpr auto MakeDefaultBlock2CTileMap(
        const CGridDesc_M_N& c_grid_desc_m_n, index_t /* M01 */, index_t /* N01 */)
    {
        return BlockToCTileMap_M00_N0_M01Adapt<MPerBlock, NPerBlock, CGridDesc_M_N>(
            c_grid_desc_m_n);
    }

    using CGridDescriptor_MBlock_MPerBlock_NBlock_NPerBlock = remove_cvref_t<decltype(
        MakeCGridDescriptor_MBlock_MPerBlock_NBlock_NPerBlock(CGridDesc_M_N{}))>;
    using DefaultBlock2CTileMap =
        remove_cvref_t<decltype(MakeDefaultBlock2CTileMap(CGridDesc_M_N{}, 1, 1))>;
    
    struct SharedMemTrait
    {
        // LDS allocation for A and B: be careful of alignment
        static constexpr auto a_block_desc_ak0_m_ak1 =
            GetABlockDescriptor_AK0PerBlock_MPerBlock_AK1();
        static constexpr auto b0_block_desc_bk0_l_bk1 =
            GetB0BlockDescriptor_BK0PerBlock_LPerBlock_BK1();
        static constexpr auto b1_block_desc_bl0_n_bl1 =
            GetB1BlockDescriptor_BL0PerBlock_NPerBlock_BL1();

        static constexpr auto max_lds_align = math::lcm(math::lcm(AK1, BK1), BL1);

        static constexpr auto a_block_space_size_aligned = math::integer_least_multiple(
            a_block_desc_ak0_m_ak1.GetElementSpaceSize(), max_lds_align);
        static constexpr auto b0_block_space_size_aligned = math::integer_least_multiple(
            b0_block_desc_bk0_l_bk1.GetElementSpaceSize(), max_lds_align);
        static constexpr auto b1_block_space_size_aligned = math::integer_least_multiple(
            b1_block_desc_bl0_n_bl1.GetElementSpaceSize(), max_lds_align);

        static constexpr auto a_block_space_offset  = 0;
        static constexpr auto b0_block_space_offset  = a_block_space_size_aligned.value;
        static constexpr auto b1_block_space_offset = 0;

        // LDS allocation for reduction
        static constexpr index_t reduction_space_size_aligned =
            math::integer_least_multiple(BlockSize, max_lds_align);

        static constexpr auto reduction_space_offset = 0;

        // LDS allocation for C shuffle in LDS
        static constexpr auto c_shuffle_block_desc_mshrepeat_mpershrepeat_nshrepeat_npershrepeat =
            GetCShuffleBlockDescriptor_MShRepeat_MPerShRepeat_NShRepeat_NPerShRepeat();
        static constexpr auto c_block_space_size =
            c_shuffle_block_desc_mshrepeat_mpershrepeat_nshrepeat_npershrepeat.GetElementSpaceSize();
    };

    template <bool HasMainKBlockLoop, typename C0MatrixMask, typename Block2CTileMap = DefaultBlock2CTileMap>
    __device__ static void Run(const FloatA* __restrict__ p_a_grid,
                               const FloatB0* __restrict__ p_b0_grid,
                               const FloatB1* __restrict__ p_b1_grid,
                               FloatC* __restrict__ p_c_grid,
                               void* __restrict__ p_shared,
                               const AGridDesc_AK0_M_AK1& a_grid_desc_k0_m_k1,
                               const B0GridDesc_BK0_L_BK1& b0_grid_desc_k0_l_k1,
                               const B1GridDesc_BL0_N_BL1& b1_grid_desc_l0_n_l1,
                               const CGridDescriptor_MBlock_MPerBlock_NBlock_NPerBlock&
                                   c_grid_desc_mblock_mperblock_nblock_nperblock,
                               const AElementwiseOperation& a_element_op,
                               const B0ElementwiseOperation& b0_element_op,
                               const AccElementwiseOperation& acc_element_op,
                               const B1ElementwiseOperation& b1_element_op,
                               const CElementwiseOperation& c_element_op,
                               const C0MatrixMask& c0_matrix_mask,
                               const Block2CTileMap& block_2_ctile_map)
    {
        // clang-format off
/*******************************************************************************/
// Memory buffer zone.
        const auto a_grid_buf = make_dynamic_buffer<AddressSpaceEnum::Global>(
            p_a_grid, a_grid_desc_k0_m_k1.GetElementSpaceSize());
        const auto b0_grid_buf = make_dynamic_buffer<AddressSpaceEnum::Global>(
            p_b0_grid, b0_grid_desc_k0_l_k1.GetElementSpaceSize());
        const auto b1_grid_buf = make_dynamic_buffer<AddressSpaceEnum::Global>(
            p_b1_grid, b1_grid_desc_l0_n_l1.GetElementSpaceSize());
        auto c_grid_buf = make_dynamic_buffer<AddressSpaceEnum::Global>(
            p_c_grid, c_grid_desc_mblock_mperblock_nblock_nperblock.GetElementSpaceSize());

/*******************************************************************************/
// BlockIdx.x -> [BlockId.m, BlockId.n]
        const auto block_work_idx = block_2_ctile_map.CalculateBottomIndex(make_multi_index(get_block_1d_id()));
        if(!block_2_ctile_map.ValidCTileIndex(
               block_work_idx,
               make_tuple(c_grid_desc_mblock_mperblock_nblock_nperblock.GetLength(I0),
                          c_grid_desc_mblock_mperblock_nblock_nperblock.GetLength(I2))))
        { return; }

        // Store BlockId into SGPR
        const index_t m_block_data_idx_on_grid = __builtin_amdgcn_readfirstlane(block_work_idx[I0] * MPerBlock);
        const index_t n_block_data_idx_on_grid = __builtin_amdgcn_readfirstlane(block_work_idx[I1] * NPerBlock);

/*******************************************************************************/
// set up Gemm0
/*******************************************************************************/

/*******************************************************************************/
// BlockLevel, A/B Matrix ThreadMapping in LDS, As Destinaion of BlockWise_Copy
        const auto K0 = a_grid_desc_k0_m_k1.GetLength(I0);

        constexpr auto a_block_desc_k0perblock_mperblock_k1  = GetABlockDescriptor_AK0PerBlock_MPerBlock_AK1();
        constexpr auto b0_block_desc_k0perblock_lperblock_k1 = GetB0BlockDescriptor_BK0PerBlock_LPerBlock_BK1();

        // A matrix blockwise copy
        auto a_blockwise_copy =
            ThreadGroupTensorSliceTransfer_v4r1<        ThisThreadBlock,
/* typename SrcElementwiseOperation,              */    AElementwiseOperation,
/* typename DstElementwiseOperation,              */    ck::tensor_operation::element_wise::PassThrough,
/* InMemoryDataOperationEnum DstInMemOp,          */    InMemoryDataOperationEnum::Set,
/* typename BlockSliceLengths,                    */    Sequence<AK0, MPerBlock, AK1>,
/* typename ThreadClusterLengths,                 */    ABlockTransferThreadClusterLengths_K0_M_K1,
/* typename ThreadClusterArrangeOrder,            */    ABlockTransferThreadClusterArrangeOrder,
/* typename SrcData,                              */    FloatA,
/* typename DstData,                              */    FloatA,
/* typename SrcDesc,                              */    decltype(a_grid_desc_k0_m_k1),
/* typename DstDesc,                              */    decltype(a_block_desc_k0perblock_mperblock_k1),
/* typename SrcDimAccessOrder,                    */    ABlockTransferSrcAccessOrder,
/* typename DstDimAccessOrder,                    */    Sequence<0, 1, 2>,
/* index_t SrcVectorDim,                          */    ABlockTransferSrcVectorDim,
/* index_t DstVectorDim,                          */    2,
/* index_t SrcScalarPerVector,                    */    ABlockTransferSrcScalarPerVector,
/* index_t DstScalarPerVector,                    */    ABlockTransferDstScalarPerVector_K1,
/* index_t SrcScalarStrideInVector,               */    1,
/* index_t DstScalarStrideInVector,               */    1,
/* bool ThreadTransferSrcResetCoordinateAfterRun, */    AThreadTransferSrcResetCoordinateAfterRun,
/* bool ThreadTransferDstResetCoordinateAfterRun, */    true>(
                a_grid_desc_k0_m_k1,
                make_multi_index(0, m_block_data_idx_on_grid, 0),
                a_element_op,
                a_block_desc_k0perblock_mperblock_k1,
                make_multi_index(0, 0, 0),
                ck::tensor_operation::element_wise::PassThrough{});

        // B matrix blockwise copy
        auto b0_blockwise_copy =
            ThreadGroupTensorSliceTransfer_v4r1<ThisThreadBlock,
                                                B0ElementwiseOperation,
                                                ck::tensor_operation::element_wise::PassThrough,
                                                InMemoryDataOperationEnum::Set,
                                                Sequence<BK0, LPerBlock, BK1>,
                                                B0BlockTransferThreadClusterLengths_K0_L_K1,
                                                B0BlockTransferThreadClusterArrangeOrder,
                                                FloatB0,
                                                FloatB0,
                                                decltype(b0_grid_desc_k0_l_k1),
                                                decltype(b0_block_desc_k0perblock_lperblock_k1),
                                                B0BlockTransferSrcAccessOrder,
                                                Sequence<0, 1, 2>,
                                                B0BlockTransferSrcVectorDim,
                                                2,
                                                B0BlockTransferSrcScalarPerVector,
                                                B0BlockTransferDstScalarPerVector_K1,
                                                1,
                                                1,
                                                B0ThreadTransferSrcResetCoordinateAfterRun,
                                                true>(
                b0_grid_desc_k0_l_k1,
                make_multi_index(0, 0, 0),
                b0_element_op,
                b0_block_desc_k0perblock_lperblock_k1,
                make_multi_index(0, 0, 0),
                ck::tensor_operation::element_wise::PassThrough{});

/*******************************************************************************/
        // Gemm0
        constexpr auto WmmaK = 16;
        constexpr auto KPack = math::integer_least_multiple(K1Value, WmmaK);

        auto blockwise_gemm0 = BlockwiseGemmWMMA<
            BlockSize,
            FloatA,
            FloatB0,
            FloatAcc0,
            decltype(MakeA0BlockDescriptor_K0_M0_M1_M2_K1(a_block_desc_k0perblock_mperblock_k1)),
            decltype(MakeB0BlockDescriptor_K0_L0_L1_L2_K1(b0_block_desc_k0perblock_lperblock_k1)),
            MPerBlock,
            LPerBlock,
            K0PerBlock * K1Value,
            MPerWmma,
            LPerWmma,
            MRepeat,
            LRepeat,
            KPack,
            true>{}; // C' = B' x A'
            

        // Prepare Register for A*B0 matrix
        auto acc0_thread_buf = blockwise_gemm0.GetCThreadBuffer();

        constexpr auto acc0_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs =
            blockwise_gemm0.GetCThreadDescriptor_MRepeat_MWave_MThreadPerSubGroup_NRepeat_NWave_NSubGroup_NAccVgprs();
        
        constexpr auto mrepeat            = acc0_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I0);
        constexpr auto mwave              = acc0_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I1);
        constexpr auto mthreadpersubgroup = acc0_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I2);
        constexpr auto lrepeat            = acc0_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I3);
        constexpr auto lwave              = acc0_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I4);
        constexpr auto lsubgroup          = acc0_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I5);
        constexpr auto laccvgprs          = acc0_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I6);

        constexpr auto acc0_thread_desc_l0perblock_mperblock_l1 = transform_tensor_descriptor(
            acc0_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs,
            make_tuple(make_merge_transform_v3_division_mod(make_tuple(lrepeat, lwave, lsubgroup)),
                       make_merge_transform_v3_division_mod(make_tuple(mrepeat, mwave, mthreadpersubgroup)),
                       make_pass_through_transform(laccvgprs)),
            make_tuple(Sequence<3, 4, 5>{}, Sequence<0, 1, 2>{}, Sequence<6>{}),
            make_tuple(Sequence<0>{}, Sequence<1>{}, Sequence<2>{}));

/*******************************************************************************/
        // LDS allocation for A and B: be careful of alignment
        auto a_block_buf = make_dynamic_buffer<AddressSpaceEnum::Lds>(static_cast<FloatA*>(p_shared) + SharedMemTrait::a_block_space_offset, 
                                                                      a_block_desc_k0perblock_mperblock_k1.GetElementSpaceSize());
        auto b0_block_buf = make_dynamic_buffer<AddressSpaceEnum::Lds>(static_cast<FloatB0*>(p_shared) + SharedMemTrait::b0_block_space_offset,
                                                                      b0_block_desc_k0perblock_lperblock_k1.GetElementSpaceSize());
        
        // Shift Per SUB_K
        constexpr auto a_block_slice_copy_step  = make_multi_index(K0PerBlock, 0, 0);
        constexpr auto b0_block_slice_copy_step = make_multi_index(K0PerBlock, 0, 0);
        const auto a_block_reset_copy_step      = make_multi_index(-a_grid_desc_k0_m_k1.GetLength(I0), 0, 0);
        const auto b0_block_reset_copy_step     = make_multi_index(-b0_grid_desc_k0_l_k1.GetLength(I0), LPerBlock, 0);

        const index_t K0BlockMainLoop = __builtin_amdgcn_readfirstlane(K0 / K0PerBlock);
/*******************************************************************************/
// softmax
/*******************************************************************************/
        auto workspace_buf = make_dynamic_buffer<AddressSpaceEnum::Lds>(
            static_cast<FloatAcc0*>(p_shared) + SharedMemTrait::reduction_space_offset, 
            SharedMemTrait::reduction_space_size_aligned);
        // get acc0 7D thread cluster
        constexpr auto thread_cluster_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs =
            blockwise_gemm0.GetCBlockDescriptor_MRepeat_MWave_MThreadPerSubGroup_NRepeat_NWave_NSubGroup_NAccVgprs().GetLengths() /
            blockwise_gemm0.GetCThreadDescriptor_MRepeat_MWave_MThreadPerSubGroup_NRepeat_NWave_NSubGroup_NAccVgprs().GetLengths();
        constexpr auto t_mrepeat            = thread_cluster_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.At(I0);
        constexpr auto t_mwave              = thread_cluster_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.At(I1);
        constexpr auto t_mthreadpersubgroup = thread_cluster_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.At(I2);
        constexpr auto t_lrepeat            = thread_cluster_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.At(I3);
        constexpr auto t_lwave              = thread_cluster_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.At(I4);
        constexpr auto t_lsubgroup          = thread_cluster_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.At(I5);
        constexpr auto t_laccvgprs          = thread_cluster_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.At(I6);
        // get acc0 thread map
        constexpr auto m0_l_m1_to_m_l_adaptor = make_single_stage_tensor_adaptor(
            make_tuple(make_unmerge_transform(make_tuple(t_mrepeat * t_mwave, t_mthreadpersubgroup)),
                       make_pass_through_transform(I1)),
            make_tuple(Sequence<0>{}, Sequence<1>{}),
            make_tuple(Sequence<0, 2>{}, Sequence<1>{}));
        constexpr auto threadid_to_m0_l_m1_adaptor = make_single_stage_tensor_adaptor(
            make_tuple(
                make_merge_transform(
                    make_tuple(t_mrepeat * t_mwave, t_lrepeat * t_lwave * t_lsubgroup * t_laccvgprs, t_mthreadpersubgroup))),
            make_tuple(Sequence<0, 1, 2>{}),
            make_tuple(Sequence<0>{}));
        const auto threadid_to_l_n_thread_cluster_adaptor =
            chain_tensor_adaptors(m0_l_m1_to_m_l_adaptor, threadid_to_m0_l_m1_adaptor);

        // get acc0 2D thread cluster & 2D thread slice
        constexpr auto thread_cluster_desc_m_l = make_naive_tensor_descriptor_packed(
            make_tuple(t_mrepeat * t_mwave * t_mthreadpersubgroup, t_lrepeat * t_lwave * t_lsubgroup * t_laccvgprs));

        constexpr auto thread_slice_desc_m_l   = make_naive_tensor_descriptor_packed(
            make_tuple(mrepeat * mwave * mthreadpersubgroup, lrepeat * lwave * lsubgroup * laccvgprs));
            
        auto blockwise_softmax = BlockwiseSoftmax<BlockSize,
                                                  FloatAcc0,
                                                  decltype(threadid_to_l_n_thread_cluster_adaptor),
                                                  decltype(thread_cluster_desc_m_l),
                                                  decltype(thread_slice_desc_m_l)>{};
        
        // Initialize running sum and max of exponentiating row vectors
        using SoftmaxBuf = typename decltype(blockwise_softmax)::BufferType;
        SoftmaxBuf running_sum, running_sum_new, running_max, running_max_new;
        running_sum     = 0;
        running_sum_new = 0;
        running_max     = NumericLimits<FloatAcc0>::Lowest();
        running_max_new = NumericLimits<FloatAcc0>::Lowest();
/*******************************************************************************/
// set up Gemm1
/*******************************************************************************/
        // B1 matrix in LDS memory, dst of blockwise copy
        constexpr auto b1_block_desc_l0perblock_nperblock_l1 = GetB1BlockDescriptor_BL0PerBlock_NPerBlock_BL1();
        constexpr auto b1_block_slice_copy_step = make_multi_index(BL0, 0, 0);

        // A1 matrix in VGPR
        constexpr auto A1ThreadSlice_L0PerBlock_MPerBlock_L1 = make_tuple(
            Number<AL0 * AL1 / laccvgprs>{}, 
            Number<mrepeat * mwave * mthreadpersubgroup>{}, 
            Number<laccvgprs>{}); // Data duplicated dimension

        constexpr auto A1ThreadSliceL0PerBlock  = A1ThreadSlice_L0PerBlock_MPerBlock_L1[I0];
        constexpr auto A1ThreadSliceMPerBlock   = A1ThreadSlice_L0PerBlock_MPerBlock_L1[I1];
        constexpr auto A1ThreadSliceL1          = A1ThreadSlice_L0PerBlock_MPerBlock_L1[I2];

        // A1 has duplicated data
        constexpr auto A1ThreadDuplicatedDim = I2 * A1ThreadSliceL1;
        constexpr auto a1_thread_desc_l0perblock_mperblock_l1 = make_naive_tensor_descriptor(
            make_tuple(A1ThreadSliceL0PerBlock, A1ThreadSliceMPerBlock, A1ThreadDuplicatedDim),
            make_tuple(A1ThreadSliceMPerBlock * A1ThreadDuplicatedDim, A1ThreadDuplicatedDim, I1));

        // A1 matrix blockwise copy
        auto a1_blockwise_copy = ThreadwiseTensorSliceTransfer_StaticToStatic_InterRow<
            FloatAcc0,
            FloatA,
            decltype(acc0_thread_desc_l0perblock_mperblock_l1),
            decltype(a1_thread_desc_l0perblock_mperblock_l1),
            tensor_operation::element_wise::PassThrough,
            Sequence<A1ThreadSliceL0PerBlock, A1ThreadSliceMPerBlock, A1ThreadSliceL1>,
            Sequence<0, 1, 2>,
            2,
            laccvgprs,
        //  dst Rowlane
        //  0x76543210  0xfedcba98
        //  src Rowlane
            0x76543210, 0xfedcba98,
            false>{tensor_operation::element_wise::PassThrough{}};
        
        // B1 matrix blockwise copy
        auto b1_blockwise_copy =
            ThreadGroupTensorSliceTransfer_v4r1<     ThisThreadBlock,
/* typename SrcElementwiseOperation,              */ B1ElementwiseOperation,
/* typename DstElementwiseOperation,              */ tensor_operation::element_wise::PassThrough,
/* InMemoryDataOperationEnum DstInMemOp,          */ InMemoryDataOperationEnum::Set,
/* typename BlockSliceLengths,                    */ Sequence<BL0, NPerBlock, BL1>,
/* typename ThreadClusterLengths,                 */ B1BlockTransferThreadClusterLengths_L0_N_L1,
/* typename ThreadClusterArrangeOrder,            */ B1BlockTransferThreadClusterArrangeOrder,
/* typename SrcData,                              */ FloatB1,
/* typename DstData,                              */ FloatB1,
/* typename SrcDesc,                              */ decltype(b1_grid_desc_l0_n_l1),
/* typename DstDesc,                              */ decltype(b1_block_desc_l0perblock_nperblock_l1),
/* typename SrcDimAccessOrder,                    */ B1BlockTransferSrcAccessOrder,
/* typename DstDimAccessOrder,                    */ Sequence<1, 0, 2>,
/* index_t SrcVectorDim,                          */ B1BlockTransferSrcVectorDim,
/* index_t DstVectorDim,                          */ 2,
/* index_t SrcScalarPerVector,                    */ B1BlockTransferSrcScalarPerVector,
/* index_t DstScalarPerVector,                    */ B1BlockTransferDstScalarPerVector_L1,
/* index_t SrcScalarStrideInVector,               */ 1,
/* index_t DstScalarStrideInVector,               */ 1,
/* bool ThreadTransferSrcResetCoordinateAfterRun, */ B1ThreadTransferSrcResetCoordinateAfterRun,
/* bool ThreadTransferDstResetCoordinateAfterRun, */ true, // DstResetCoord
                                                     NumGemmKPrefetchStage>(
                b1_grid_desc_l0_n_l1,
                make_multi_index(0, n_block_data_idx_on_grid, 0),
                b1_element_op,
                b1_block_desc_l0perblock_nperblock_l1,
                make_multi_index(0, 0, 0),
                tensor_operation::element_wise::PassThrough{});
        
        auto a1_thread_buf = make_static_buffer<AddressSpaceEnum::Vgpr, FloatA>(
            a1_thread_desc_l0perblock_mperblock_l1.GetElementSpaceSize());
        auto b1_block_buf = make_dynamic_buffer<AddressSpaceEnum::Lds>(
            static_cast<FloatB1*>(p_shared)+ SharedMemTrait::b1_block_space_offset, 
            b1_block_desc_l0perblock_nperblock_l1.GetElementSpaceSize());

        auto blockwise_gemm1 =
            BlockwiseGemmWMMA<BlockSize,
                              FloatA,
                              FloatB1,
                              FloatAcc1,
                              decltype(MakeA1BlockDescriptor_L0_M0_M1_M2_L1(a1_thread_desc_l0perblock_mperblock_l1)),
                              decltype(MakeB1BlockDescriptor_L0_N0_N1_N2_L1(b1_block_desc_l0perblock_nperblock_l1)),
                              MPerBlock,
                              NPerBlock,
                              BL0 * BL1,
                              MPerWmma,
                              NPerWmma,
                              MRepeat,
                              NRepeat,
                              KPack,
                              true>{make_tuple(0, 0, 0, 0, 0)};

        auto acc1_thread_buf = blockwise_gemm1.GetCThreadBuffer();

        const index_t num_gemm1_l_block_outer_loop = b0_grid_desc_k0_l_k1.GetLength(I1) / LPerBlock;
        constexpr index_t num_gemm1_l_block_inner_loop = LPerBlock / (BL0 * BL1);

        // Initialize C
        StaticBuffer<AddressSpaceEnum::Vgpr, FloatAcc1, acc1_thread_buf.Size(), true> c_thread_buf;
        c_thread_buf.Clear();

/*******************************************************************************/
        // Flash Attention
        // Dao, Tri, et al. "Flashattention: Fast and memory-efficient exact attention with io-awareness." arXiv preprint arXiv:2205.14135 (2022).
        index_t gemm1_l_block_outer_index = 0;
        // Outer loop, along GEMM_L
        // Inner loop, along GEMM_K
        do{
            auto l_block_data_idx_on_grid =
                __builtin_amdgcn_readfirstlane(gemm1_l_block_outer_index * LPerBlock);
            if(c0_matrix_mask.IsTileSkippable(
                   m_block_data_idx_on_grid, l_block_data_idx_on_grid, MPerBlock, LPerBlock))
            {
                continue;
            }
            // gemm0 start, A-B swaped
            GridwiseGemmPipe::template Run<HasMainKBlockLoop>(a_grid_desc_k0_m_k1,
                                                              a_block_desc_k0perblock_mperblock_k1,
                                                              a_blockwise_copy,
                                                              a_grid_buf,
                                                              a_block_buf,
                                                              a_block_slice_copy_step,
                                                              b0_grid_desc_k0_l_k1,
                                                              b0_block_desc_k0perblock_lperblock_k1,
                                                              b0_blockwise_copy,
                                                              b0_grid_buf,
                                                              b0_block_buf,
                                                              b0_block_slice_copy_step,
                                                              blockwise_gemm0,
                                                              acc0_thread_buf,
                                                              K0BlockMainLoop);
            // do MNK padding or upper triangular masking
            if constexpr(MaskOutUpperTriangle || PadN)
            {
                // 7d thread_desc in thread scope
                constexpr auto c_thread_lengths =
                    blockwise_gemm0.GetCThreadDescriptor_MRepeat_MWave_MThreadPerSubGroup_NRepeat_NWave_NSubGroup_NAccVgprs().GetLengths();

                // 7d block_desc in block scope
                constexpr auto c_block_lengths =
                    blockwise_gemm0.GetCBlockDescriptor_MRepeat_MWave_MThreadPerSubGroup_NRepeat_NWave_NSubGroup_NAccVgprs().GetLengths();

                constexpr auto MREPEAT         = c_block_lengths[I0];
                constexpr auto MWAVE           = c_block_lengths[I1];
                constexpr auto MTHREADSubGroup = c_block_lengths[I2];
                constexpr auto LREPEAT         = c_block_lengths[I3];
                constexpr auto LWAVE           = c_block_lengths[I4];
                constexpr auto LSUBGROUP       = c_block_lengths[I5];
                constexpr auto LACCVGPRS       = c_block_lengths[I6];

                // works like multi-dimension static_for (static_ford), but provides both the linear
                // index as well as n-d index
                using Acc0TileIterator = SpaceFillingCurve<
                    decltype(c_thread_lengths),
                    typename arithmetic_sequence_gen<0, c_thread_lengths.Size(), 1>::type,
                    typename uniform_sequence_gen<c_thread_lengths.Size(), 1>::type,
                    false>; // SnakeCurved

                auto acc0_thread_origin = blockwise_gemm0.CalculateCThreadOriginDataIndex7D(
                    Number<0>{}, Number<0>{});

                constexpr auto block_idx_to_m_l_adaptor = make_single_stage_tensor_adaptor(
                    make_tuple(make_unmerge_transform(make_tuple(MREPEAT, MWAVE, MTHREADSubGroup)),
                               make_unmerge_transform(make_tuple(LREPEAT, LWAVE, LSUBGROUP, LACCVGPRS))),
                    make_tuple(Sequence<0>{}, Sequence<1>{}),
                    make_tuple(Sequence<0, 1, 2>{}, Sequence<3, 4, 5, 6>{}));

                static_for<0, Acc0TileIterator::GetNumOfAccess(), 1>{}([&](auto i) {
                    auto acc0_thread_idx = Acc0TileIterator::GetIndex(i) + acc0_thread_origin;
                    auto m_local = block_idx_to_m_l_adaptor.CalculateBottomIndex(acc0_thread_idx)[I0];
                    auto l_local = block_idx_to_m_l_adaptor.CalculateBottomIndex(acc0_thread_idx)[I1];
                    auto m_global = m_local + m_block_data_idx_on_grid;
                    auto l_global = l_local + l_block_data_idx_on_grid;
                    if(c0_matrix_mask.IsMaskedElement(m_global, l_global))
                    {
                        acc0_thread_buf(i) = -ck::NumericLimits<float>::Infinity();
                    }
                    else
                    {
                        acc_element_op(acc0_thread_buf(i), acc0_thread_buf[i]);
                    }
                });
            }
            else
            {   static_for<0, acc0_thread_buf.Size(), 1>{}(
                    [&](auto i) { acc_element_op(acc0_thread_buf(i), acc0_thread_buf[i]); });
            }


            block_sync_lds();
            // gemm0 end
            // gemm0 incorrect
            // Tiled softmax start
            // softmax
            SoftmaxBuf& max = blockwise_softmax.max_value_buf;
            SoftmaxBuf& sum = blockwise_softmax.sum_value_buf;

            blockwise_softmax.Run(acc0_thread_buf, workspace_buf);
            
            // TODO: may convert to log domain
            running_max_new = mathext::max(max, running_max);
            running_sum_new = mathext::exp(running_max - running_max_new) * running_sum +
                              mathext::exp(max - running_max_new) * sum;

            // gemm1
            {
                // TODO: explore using dynamic buffer for a1 thread buffer
                // For a1_blockwise_copy, the goal is to satisfy pipeline requirements RunRead(),
                // RunWrite(), and MoveSliceWindow(). But it is impossible to implement given that
                // the A1 source buffer is static buffer holding the output of first GEMM and
                // requires constexpr offset by design. Therefore, we pass tensor coordinate offset
                // explicitly in Run() below.

                // Initialize acc1
                acc1_thread_buf.Clear();

                // preload data into LDS
                b1_blockwise_copy.RunRead(b1_grid_desc_l0_n_l1, b1_grid_buf);

                b1_blockwise_copy.MoveSrcSliceWindow(b1_grid_desc_l0_n_l1,
                                                     b1_block_slice_copy_step);

                block_sync_lds(); // wait for reduction LDS read

                b1_blockwise_copy.RunWrite(b1_block_desc_l0perblock_nperblock_l1, b1_block_buf);

                // main body
                if constexpr(num_gemm1_l_block_inner_loop > 1)
                {
                    static_for<0, num_gemm1_l_block_inner_loop - 1, 1>{}([&](auto i) {
                        // Data cast from FloatAcc0 to FloatA happen here
                        a1_blockwise_copy.Run(acc0_thread_desc_l0perblock_mperblock_l1,
                                              make_tuple(Number<i * A1ThreadSliceL0PerBlock>{}, I0, I0),
                                              acc0_thread_buf,
                                              a1_thread_desc_l0perblock_mperblock_l1,
                                              make_tuple(I0, I0, I0),
                                              a1_thread_buf);

                        b1_blockwise_copy.RunRead(b1_grid_desc_l0_n_l1, b1_grid_buf);

                        block_sync_lds();

                        blockwise_gemm1.Run(a1_thread_buf, b1_block_buf, acc1_thread_buf);

                        block_sync_lds();

                        b1_blockwise_copy.MoveSrcSliceWindow(b1_grid_desc_l0_n_l1,
                                                             b1_block_slice_copy_step);

                        b1_blockwise_copy.RunWrite(b1_block_desc_l0perblock_nperblock_l1, b1_block_buf);
                    });
                }
                // tail
                {
                    a1_blockwise_copy.Run(
                        acc0_thread_desc_l0perblock_mperblock_l1,
                        make_tuple(
                            Number<(num_gemm1_l_block_inner_loop - 1) * A1ThreadSliceL0PerBlock>{}, I0, I0),
                        acc0_thread_buf,
                        a1_thread_desc_l0perblock_mperblock_l1,
                        make_tuple(I0, I0, I0),
                        a1_thread_buf);

                    block_sync_lds();
            
                    blockwise_gemm1.Run(a1_thread_buf, b1_block_buf, acc1_thread_buf);
                }
            } // end gemm1

            constexpr auto c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs =
                blockwise_gemm1.GetCThreadDescriptor_MRepeat_MWave_MThreadPerSubGroup_NRepeat_NWave_NSubGroup_NAccVgprs();
            constexpr auto c_mrepeat            = c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I0);
            constexpr auto c_mwave              = c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I1);
            constexpr auto c_mthreadpersubgroup = c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I2);
            constexpr auto c_nrepeat            = c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I3);
            constexpr auto c_nwave              = c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I4);
            constexpr auto c_nsubgroup          = c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I5);
            constexpr auto c_naccvgprs          = c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs.GetLength(I6);
            
            constexpr auto c_thread_slice_desc_m_n = make_naive_tensor_descriptor_packed(
                make_tuple(c_mrepeat * c_mwave * c_mthreadpersubgroup, 
                           c_nrepeat * c_nwave * c_nsubgroup * c_naccvgprs));
            constexpr auto c_thread_buf_slice_m = c_thread_slice_desc_m_n.GetLength(I0);
            constexpr auto c_thread_buf_slice_n = c_thread_slice_desc_m_n.GetLength(I1);

            static_for<0, c_thread_buf_slice_m, 1>{}([&](auto iM) {
                static_for<0, c_thread_buf_slice_n, 1>{}([&](auto iN) {
                    auto I = Number<c_thread_slice_desc_m_n.CalculateOffset(make_tuple(iM, iN))>{};
                    FloatAcc1 acc1  = acc1_thread_buf[I]; // P*V
                    FloatAcc1 c     = c_thread_buf[I];    // O
                    FloatAcc1 c_new =
                        (running_sum[iM] * math::exp(running_max[iM] - running_max_new[iM]) * c +
                         math::exp(max[iM] - running_max_new[iM]) * acc1) /
                        running_sum_new[iM]; 

                    c_thread_buf(I) = c_new; // O_new
                });
            });

            a_blockwise_copy.MoveSrcSliceWindow(a_grid_desc_k0_m_k1,
                                                a_block_reset_copy_step); // rewind K
            b0_blockwise_copy.MoveSrcSliceWindow(b0_grid_desc_k0_l_k1,
                                                b0_block_reset_copy_step); // rewind K and step N

            // update before next j iteration
            running_max = running_max_new;
            running_sum = running_sum_new;

            block_sync_lds(); // wait for gemm1 LDS read
        }while(++gemm1_l_block_outer_index < num_gemm1_l_block_outer_loop);
/*******************************************************************************/
        // write out to C, implement shuffle
        {
            constexpr auto c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs =  
            blockwise_gemm1.GetCThreadDescriptor_MRepeat_MWave_MThreadPerSubGroup_NRepeat_NWave_NSubGroup_NAccVgprs();

            // This API Provide All dimension (size) you need
            constexpr auto c_block_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs_tmp =
                blockwise_gemm1.GetCBlockDescriptor_MRepeat_MWave_MThreadPerSubGroup_NRepeat_NWave_NSubGroup_NAccVgprs();

            constexpr auto MWave              = c_block_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs_tmp.GetLength(I1);
            constexpr auto MThreadPerSubGroup = c_block_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs_tmp.GetLength(I2);
            constexpr auto NWave              = c_block_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs_tmp.GetLength(I4);
            constexpr auto NSubGroup          = c_block_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs_tmp.GetLength(I5);
            constexpr auto NAccVgprs          = c_block_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs_tmp.GetLength(I6);

            // LDS descriptor, shuffle and write out in MRepeat x NRepeat times
            constexpr auto c_shuffle_block_desc_mshrepeat_mpershrepeat_nshrepeat_npershrepeat =
                GetCShuffleBlockDescriptor_MShRepeat_MPerShRepeat_NShRepeat_NPerShRepeat();

            auto c_shuffle_block_buf = make_dynamic_buffer<AddressSpaceEnum::Lds>(
                static_cast<FloatCShuffle*>(p_shared),
                c_shuffle_block_desc_mshrepeat_mpershrepeat_nshrepeat_npershrepeat.GetElementSpaceSize());

            constexpr auto c_block_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs = transform_tensor_descriptor(
                c_shuffle_block_desc_mshrepeat_mpershrepeat_nshrepeat_npershrepeat,
                make_tuple(
                    make_freeze_transform(I0),
                    make_unmerge_transform(make_tuple(
                        Number<CShuffleMRepeatPerShuffle>{}, // MRepeat per shuffle repeat
                        MWave,                               // MWave
                        MThreadPerSubGroup                   // MThreadPerSubGroup = MPerWmma
                        )),
                    make_freeze_transform(I0),
                    make_unmerge_transform(make_tuple(
                        Number<CShuffleNRepeatPerShuffle>{}, // NRepeat per shuffle repeat
                        NWave,                               // NWave
                        NSubGroup,
                        NAccVgprs))),                        // NSubGroup * NAccVgprs = NPerWmma
                make_tuple(Sequence<0>{}, Sequence<1>{}, Sequence<2>{}, Sequence<3>{}),
                make_tuple(Sequence<>{}, Sequence<0, 1, 2>{}, Sequence<>{}, Sequence<3, 4, 5, 6>{}));

            // calculate origin of thread output tensor on global memory
            //     blockwise GEMM c matrix starting index
            const auto c_thread_mtx_on_block = blockwise_gemm1.CalculateCThreadOriginDataIndex(I0, I0);

            const index_t m_thread_data_on_block = c_thread_mtx_on_block[I0];
            const index_t n_thread_data_on_block = c_thread_mtx_on_block[I1];

            const auto m_thread_data_on_block_to_mrepeat_mwave_mthreadpersubgroup_adaptor =
            make_single_stage_tensor_adaptor(
                make_tuple(make_merge_transform(make_tuple(MRepeat, MWave, MThreadPerSubGroup))),
                make_tuple(Sequence<0, 1, 2>{}),
                make_tuple(Sequence<0>{}));

            const auto n_thread_data_on_block_to_nrepeat_nwave_nsubgroup_naccvgprs_adaptor =
            make_single_stage_tensor_adaptor(
                make_tuple(make_merge_transform(make_tuple(NRepeat, NWave, NSubGroup, NAccVgprs))),
                make_tuple(Sequence<0, 1, 2, 3>{}),
                make_tuple(Sequence<0>{}));
            
            const auto m_thread_data_on_block_idx = m_thread_data_on_block_to_mrepeat_mwave_mthreadpersubgroup_adaptor.CalculateBottomIndex(
                make_multi_index(m_thread_data_on_block));
            
            const auto n_thread_data_on_block_idx = n_thread_data_on_block_to_nrepeat_nwave_nsubgroup_naccvgprs_adaptor.CalculateBottomIndex(
                make_multi_index(n_thread_data_on_block));

            // shuffle: threadwise copy C from VGPR to LDS
            auto c_thread_copy_vgpr_to_lds =
                ThreadwiseTensorSliceTransfer_v1r3<FloatAcc1,
                                                   FloatCShuffle,
                                                   decltype(c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs),
                                                   decltype(c_block_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs),
                                                   ck::tensor_operation::element_wise::PassThrough,
                                                   Sequence<CShuffleMRepeatPerShuffle,
                                                            I1,
                                                            I1,
                                                            CShuffleNRepeatPerShuffle,
                                                            I1,
                                                            I1,
                                                            NAccVgprs>,
                                                   Sequence<0, 1, 2, 3, 4, 5, 6>,
                                                   6,
                                                   8, // vector write pixel
                                                   InMemoryDataOperationEnum::Set,
                                                   1,
                                                   true>{
                    c_block_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs,
                    make_multi_index(0,
                                     m_thread_data_on_block_idx[I1],
                                     m_thread_data_on_block_idx[I2],
                                     0,
                                     n_thread_data_on_block_idx[I1],
                                     n_thread_data_on_block_idx[I2],
                                     n_thread_data_on_block_idx[I3]),
                    ck::tensor_operation::element_wise::PassThrough{}};

            // shuffle: blockwise copy C from LDS to global
            auto c_shuffle_block_copy_lds_to_global = ThreadGroupTensorSliceTransfer_v6r1<
                ThisThreadBlock,            // ThreadGroup
                CElementwiseOperation,      // ElementwiseOperation,
                CGlobalMemoryDataOperation, // DstInMemOp,
                Sequence<1,
                         CShuffleMRepeatPerShuffle * MWave * MPerWmma,
                         1,
                         CShuffleNRepeatPerShuffle * NWave * NPerWmma>, // BlockSliceLengths,
                CShuffleBlockTransferClusterLengths_MBlock_MPerBlock_NBlock_NPerBlock,
                Sequence<0, 1, 2, 3>, // typename ThreadClusterArrangeOrder,
                FloatCShuffle,        // typename SrcData,
                FloatC,               // typename DstData,
                decltype(c_shuffle_block_desc_mshrepeat_mpershrepeat_nshrepeat_npershrepeat),
                decltype(c_grid_desc_mblock_mperblock_nblock_nperblock),
                Sequence<0, 1, 2, 3>,                           // typename DimAccessOrder,
                3,                                              // index_t VectorDim,
                CShuffleBlockTransferScalarPerVector_NPerBlock, // index_t ScalarPerVector,
                true,  // bool ThreadTransferSrcResetCoordinateAfterRun,
                false> // bool ThreadTransferDstResetCoordinateAfterRun>
                {c_shuffle_block_desc_mshrepeat_mpershrepeat_nshrepeat_npershrepeat,
                 make_multi_index(0, 0, 0, 0),
                 c_grid_desc_mblock_mperblock_nblock_nperblock,
                 make_multi_index(block_work_idx[I0], 0, block_work_idx[I1], 0),
                 c_element_op};

            // space filling curve for local reg & global memory
            // space filling curve for threadwise C in VGPR
            constexpr auto sfc_c_vgpr =
                SpaceFillingCurve<Sequence<MRepeat, 1, 1, NRepeat, 1, 1, NAccVgprs>,
                                  Sequence<0, 1, 2, 3, 4, 5, 6>,
                                  Sequence<CShuffleMRepeatPerShuffle,
                                           1,
                                           1,
                                           CShuffleNRepeatPerShuffle,
                                           1,
                                           1,
                                           NAccVgprs>>{};

            // space filling curve for shuffled blockwise C in global mem
            constexpr auto sfc_c_global =
                SpaceFillingCurve<Sequence<1, MPerBlock, 1, NPerBlock>,
                                  Sequence<0, 2, 1, 3>,
                                  Sequence<1,
                                           CShuffleMRepeatPerShuffle * MWave * MPerWmma,
                                           1,
                                           CShuffleNRepeatPerShuffle * NWave * NPerWmma>>{};

            constexpr index_t num_access = sfc_c_vgpr.GetNumOfAccess();

            static_assert(num_access == sfc_c_global.GetNumOfAccess(), "wrong!");

            static_for<0, num_access, 1>{}([&](auto access_id) {
                // make sure it's safe to write to LDS
                block_sync_lds();

                // each thread write its data from VGPR to LDS
                c_thread_copy_vgpr_to_lds.Run(c_thread_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs,
                                              sfc_c_vgpr.GetIndexTupleOfNumber(access_id),
                                              c_thread_buf,
                                              c_block_desc_mrepeat_mwave_mthreadpersubgroup_nrepeat_nwave_nsubgroup_naccvgprs,
                                              c_shuffle_block_buf);

                // make sure it's safe to read from LDS
                block_sync_lds();

                // each block copy its data from LDS to global
                c_shuffle_block_copy_lds_to_global.Run(
                    c_shuffle_block_desc_mshrepeat_mpershrepeat_nshrepeat_npershrepeat,
                    c_shuffle_block_buf,
                    c_grid_desc_mblock_mperblock_nblock_nperblock,
                    c_grid_buf);

                if constexpr(access_id < num_access - 1)
                {
                    constexpr auto c_global_step = sfc_c_global.GetForwardStep(access_id);
                    // move on C
                    c_shuffle_block_copy_lds_to_global.MoveDstSliceWindow(
                        c_grid_desc_mblock_mperblock_nblock_nperblock, c_global_step);
                }
            });
        }
        // clang-format on
    }
};

} // namespace ck
