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 // SPDX-License-Identifier: MIT
 // Copyright (c) 2018-2024, Advanced Micro Devices, Inc. All rights reserved.
  
 #pragma once
  
 #include "ck_tile/core.hpp"
 #include "ck_tile/ops/gemm/warp/warp_gemm.hpp"
  
 namespace ck_tile {
  
 struct NullBlockDropout
 {
     template <typename BlockGemm, bool IsFwd = true, typename RandValDramBlockWindowTmp>
     __host__ __device__ static constexpr auto
     MakeRandvalDramWindow(RandValDramBlockWindowTmp& randval_dram_block_window_tmp,
                           index_t seqlen_qk_start)
     {
         (void)randval_dram_block_window_tmp;
         (void)seqlen_qk_start;
  
         return make_null_tile_window(make_tuple(number<0>{}, number<0>{}));
     }
 };
  
 struct BlockDropout
 {
     CK_TILE_HOST_DEVICE BlockDropout(index_t i_batch,
                                      index_t i_head,
                                      index_t nheads,
                                      unsigned long long seed,
                                      unsigned long long offset,
                                      float rp_undrop_,
                                      uint8_t p_undrop_in_uint8_t_,
                                      bool is_store_randval_)
         : ph(seed, offset + (i_batch * nheads + i_head) * get_warp_size() + get_lane_id()),
           rp_undrop(rp_undrop_),
           p_undrop_in_uint8_t(p_undrop_in_uint8_t_),
           is_store_randval(is_store_randval_)
     {
     }
  
     template <typename BlockGemm, bool IsFwd = true, typename RandValDramBlockWindowTmp>
     CK_TILE_HOST_DEVICE static constexpr auto
     MakeRandvalDramWindow(RandValDramBlockWindowTmp& randval_dram_block_window_tmp,
                           index_t seqlen_qk_start)
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         using WG                    = remove_cvref_t<decltype(config.template at<0>())>;
         constexpr index_t MWarp     = config.template at<1>();
         constexpr index_t NWarp     = config.template at<2>();
         constexpr index_t kMPerStep = MWarp * WG::kM;
         constexpr index_t kNPerStep = NWarp * WG::kN;
  
         const auto block_origin  = randval_dram_block_window_tmp.get_window_origin();
         auto randval_dram_window = [&]() {
             if constexpr(IsFwd)
             {
                 return make_tile_window(
                     randval_dram_block_window_tmp.get_bottom_tensor_view(),
                     ck_tile::make_tuple(number<kMPerStep>{}, number<kNPerStep>{}),
                     {block_origin.at(number<0>{}), seqlen_qk_start}); // M/N
             }
             else
             {
                 return make_tile_window(
                     randval_dram_block_window_tmp.get_bottom_tensor_view(),
                     ck_tile::make_tuple(number<kMPerStep>{}, number<kNPerStep>{}),
                     {seqlen_qk_start, block_origin.at(number<1>{})}); // M/N
             }
         }();
  
         return randval_dram_window;
     }
  
     template <typename BlockGemm>
     CK_TILE_HOST_DEVICE static constexpr auto MakeRandValLdsBlockDescriptor()
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         using WG                    = remove_cvref_t<decltype(config.template at<0>())>;
         constexpr index_t MWarp     = config.template at<1>();
         constexpr index_t kMPerStep = MWarp * WG::kM;
         constexpr index_t kNPerStep = WG::kN;
         constexpr index_t kN1       = 8;
         constexpr index_t kN0       = kNPerStep / kN1;
  
         constexpr auto randval_lds_block_desc_0 = make_naive_tensor_descriptor(
             ck_tile::make_tuple(number<kN0>{}, number<kMPerStep>{}, number<kN1>{}),
             ck_tile::make_tuple(number<(kMPerStep + 1) * kN1>{}, number<kN1>{}, number<1>{}),
             number<kN1>{},
             number<1>{});
  
         constexpr auto randval_lds_block_desc = transform_tensor_descriptor(
             randval_lds_block_desc_0,
             ck_tile::make_tuple(
                 make_pass_through_transform(number<kMPerStep>{}),
                 make_merge_transform(ck_tile::make_tuple(number<kN0>{}, number<kN1>{}))),
             ck_tile::make_tuple(sequence<1>{}, sequence<0, 2>{}),
             ck_tile::make_tuple(sequence<0>{}, sequence<1>{}));
  
         return randval_lds_block_desc;
     }
  
     template <typename BlockGemm>
     CK_TILE_HOST_DEVICE static constexpr auto MakeRandValTileDistribution()
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         constexpr index_t MWarp = config.template at<1>();
         constexpr index_t NWarp = config.template at<2>();
  
         constexpr index_t MIterPerWarp = 1;
         constexpr index_t NIterPerWarp = 1;
  
         constexpr auto randval_block_outer_part_dstr_encoding = tile_distribution_encoding<
             sequence<>,
             tuple<sequence<MIterPerWarp, MWarp>, sequence<NIterPerWarp, NWarp>>,
             tuple<sequence<1, 2>>,
             tuple<sequence<1, 1>>,
             sequence<1, 2>,
             sequence<0, 0>>{};
  
         // Use Bwd WarpGemm to ensure that Fwd's random values ​​are consistent with Bwd.
         constexpr auto randval_block_inner_part_dstr_encoding = []() {
             if constexpr(std::is_same_v<typename BlockGemm::ADataType, half_t> &&
                          std::is_same_v<typename BlockGemm::BDataType, half_t> &&
                          std::is_same_v<typename BlockGemm::CDataType, float>)
             {
                 return typename WarpGemmMfmaF16F16F32M32N32K16SwizzleA::CWarpDstrEncoding{};
             }
             else
             {
                 return typename WarpGemmMfmaBf16Bf16F32M32N32K16SwizzleA::CWarpDstrEncoding{};
             }
         }();
  
         constexpr auto randval_block_part_dstr_encode =
             detail::make_embed_tile_distribution_encoding(randval_block_outer_part_dstr_encoding,
                                                           randval_block_inner_part_dstr_encoding);
  
         return make_static_tile_distribution(randval_block_part_dstr_encode);
     }
  
     template <typename BlockGemm>
     CK_TILE_HOST_DEVICE static constexpr auto MakeRandValLdsShuffleTileDistribution()
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         using WG                = remove_cvref_t<decltype(config.template at<0>())>;
         constexpr index_t MWarp = config.template at<1>();
         constexpr index_t NWarp = config.template at<2>();
  
         constexpr index_t MIterPerWarp = 1;
         constexpr index_t NIterPerWarp = 1;
  
         constexpr auto randval_block_outer_part_dstr_encoding = tile_distribution_encoding<
             sequence<>,
             tuple<sequence<MIterPerWarp, MWarp>, sequence<NIterPerWarp, NWarp>>,
             tuple<sequence<1, 2>>,
             tuple<sequence<1, 1>>,
             sequence<1, 2>,
             sequence<0, 0>>{};
  
         constexpr auto randval_block_part_dstr_encode =
             detail::make_embed_tile_distribution_encoding(randval_block_outer_part_dstr_encoding,
                                                           typename WG::CWarpDstrEncoding{});
  
         return make_static_tile_distribution(randval_block_part_dstr_encode);
     }
  
     template <typename BlockGemm,
               typename PComputeDataType,
               typename RandValOutputDataType,
               typename PComputeWindow,
               typename RandValDramWindow>
     CK_TILE_HOST_DEVICE void Run(void* randval_ptr,
                                  const index_t start_n0_idx,
                                  PComputeWindow& p_compute,
                                  RandValDramWindow& randval_dram_window) const
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         using WG                     = remove_cvref_t<decltype(config.template at<0>())>;
         constexpr index_t MWarp      = config.template at<1>();
         constexpr index_t NWarp      = config.template at<2>();
         using BlockGemmShape         = remove_cvref_t<typename BlockGemm::BlockGemmShape>;
         constexpr index_t kMPerBlock = BlockGemmShape::kM;
         constexpr index_t kNPerBlock = BlockGemmShape::kN;
         constexpr index_t kMPerStep  = MWarp * WG::kM;
         constexpr index_t kNPerStep  = NWarp * WG::kN;
  
         // randval tile in LDS
         auto randval_lds = make_tensor_view<address_space_enum::lds>(
             reinterpret_cast<uint8_t*>(randval_ptr), MakeRandValLdsBlockDescriptor<BlockGemm>());
  
         auto randval_lds_window = make_tile_window(
             randval_lds, MakeRandValLdsBlockDescriptor<BlockGemm>().get_lengths(), {0, 0});
  
         // register distribute
         auto randval_dist_generated =
             make_static_distributed_tensor<uint8_t>(MakeRandValTileDistribution<BlockGemm>());
         static_assert(randval_dist_generated.kThreadElementSpaceSize == 16);
  
         auto randval_lds_read_window =
             make_tile_window(randval_lds_window.get_bottom_tensor_view(),
                              randval_lds_window.get_window_lengths(),
                              randval_lds_window.get_window_origin(),
                              MakeRandValLdsShuffleTileDistribution<BlockGemm>());
  
         const int start_m0_idx = randval_dram_window.get_window_origin().at(number<0>{});
         if(is_store_randval)
         {
             static_for<0, kMPerBlock / kMPerStep, 1>{}([&](auto i_m0) {
                 static_for<0, kNPerBlock / kNPerStep, 1>{}([&](auto i_n0) {
                     int block_row_start = (start_m0_idx / WG::kM) + (i_m0 * MWarp) + get_warp_id();
                     int block_col_start = (start_n0_idx / WG::kN) + i_n0;
                     uint2 rowcol        = make_uint2(block_row_start, block_col_start);
  
                     // generate random number
                     uint8_t random_uint8_t[16];
                     ph.get_random_16x8(random_uint8_t,
                                        reinterpret_cast<unsigned long long&>(rowcol));
  
                     constexpr auto randval_dist_generated_spans =
                         decltype(randval_dist_generated)::get_distributed_spans();
                     int i_random_idx = 0;
                     sweep_tile_span(randval_dist_generated_spans[number<0>{}], [&](auto idx0) {
                         sweep_tile_span(randval_dist_generated_spans[number<1>{}], [&](auto idx1) {
                             constexpr auto i_j_idx          = ck_tile::make_tuple(idx0, idx1);
                             randval_dist_generated(i_j_idx) = random_uint8_t[i_random_idx++];
                         });
                     });
                     // save to LDS
                     store_tile(randval_lds_window, randval_dist_generated);
                     block_sync_lds();
                     // read from LDS to register
                     auto randval = load_tile(randval_lds_read_window);
                     // save to Global
                     const auto randval_store = cast_tile<RandValOutputDataType>(randval);
                     store_tile(randval_dram_window, randval_store);
                     move_tile_window(randval_dram_window, {0, kNPerStep});
                 });
                 move_tile_window(randval_dram_window, {kMPerStep, -kNPerBlock});
             });
             move_tile_window(randval_dram_window, {-kMPerBlock, kNPerBlock});
         };
         static_for<0, kMPerBlock / kMPerStep, 1>{}([&](auto i_m0) {
             static_for<0, kNPerBlock / kNPerStep, 1>{}([&](auto i_n0) {
                 int block_row_start = (start_m0_idx / WG::kM) + (i_m0 * MWarp) + get_warp_id();
                 int block_col_start = (start_n0_idx / WG::kN) + i_n0;
                 uint2 rowcol        = make_uint2(block_row_start, block_col_start);
  
                 // generate random number
                 uint8_t random_uint8_t[16];
                 ph.get_random_16x8(random_uint8_t, reinterpret_cast<unsigned long long&>(rowcol));
  
                 constexpr auto randval_dist_generated_spans =
                     decltype(randval_dist_generated)::get_distributed_spans();
                 int i_random_idx = 0;
                 sweep_tile_span(randval_dist_generated_spans[number<0>{}], [&](auto idx0) {
                     sweep_tile_span(randval_dist_generated_spans[number<1>{}], [&](auto idx1) {
                         constexpr auto i_j_idx          = ck_tile::make_tuple(idx0, idx1);
                         randval_dist_generated(i_j_idx) = random_uint8_t[i_random_idx++];
                     });
                 });
                 // save to LDS
                 store_tile(randval_lds_window, randval_dist_generated);
                 block_sync_lds();
                 // read from LDS to register
                 auto randval                 = load_tile(randval_lds_read_window);
                 constexpr auto randval_spans = decltype(randval)::get_distributed_spans();
                 sweep_tile_span(randval_spans[number<0>{}], [&](auto idx0) {
                     sweep_tile_span(randval_spans[number<1>{}], [&](auto idx1) {
                         constexpr auto p_idx0 = tile_distributed_index<i_m0>{};
                         constexpr auto p_idx1 =
                             tile_distributed_index<i_n0, idx1.impl_.at(1), idx1.impl_.at(2)>{};
                         constexpr auto p_idx = ck_tile::make_tuple(p_idx0, p_idx1);
                         constexpr auto r_idx = ck_tile::make_tuple(idx0, idx1);
                         p_compute(p_idx)     = randval[r_idx] <= p_undrop_in_uint8_t
                                                    ? p_compute[p_idx] * rp_undrop
                                                    : PComputeDataType(0);
                     });
                 });
             });
         });
     }
  
     ck_tile::philox ph;
     const float rp_undrop;
     const uint8_t p_undrop_in_uint8_t;
     const bool is_store_randval;
 };
  
 template <bool IsDropout_, bool IsWG32_, bool IsStoreRandval_>
 struct BlockDropoutBwd;
  
 template <bool IsWG32_, bool IsStoreRandval_>
 struct BlockDropoutBwd<false, IsWG32_, IsStoreRandval_>
 {
     static constexpr bool IsDropout      = false;
     static constexpr bool IsStoreRandval = IsStoreRandval_;
  
     template <typename BlockGemm, bool IsFwd = true, typename RandValDramBlockWindowTmp>
     __host__ __device__ static constexpr auto
     MakeRandvalDramWindow(RandValDramBlockWindowTmp& randval_dram_block_window_tmp,
                           index_t seqlen_qk_start)
     {
         (void)randval_dram_block_window_tmp;
         (void)seqlen_qk_start;
  
         return make_null_tile_window(make_tuple(number<0>{}, number<0>{}));
     }
 };
  
 template <bool IsWG32_, bool IsStoreRandval_>
 struct BlockDropoutBwd<true, IsWG32_, IsStoreRandval_>
 {
     static constexpr bool IsDropout = true;
     // true:  32*32 warp gemm
     // false: 16*16 warp gemm
     static constexpr bool IsWG32         = IsWG32_;
     static constexpr bool IsStoreRandval = IsStoreRandval_;
  
     CK_TILE_HOST_DEVICE BlockDropoutBwd(index_t i_batch,
                                         index_t i_head,
                                         index_t nheads,
                                         unsigned long long seed,
                                         unsigned long long offset,
                                         float rp_undrop_,
                                         uint8_t p_undrop_in_uint8_t_)
         : ph(seed,
              offset + (i_batch * nheads + i_head) * get_warp_size() +
                  (IsWG32 ? get_lane_id() : ((get_lane_id() & 47) + ((get_warp_id() & 1) << 4)))),
           rp_undrop(rp_undrop_),
           p_undrop_in_uint8_t(p_undrop_in_uint8_t_)
     {
     }
  
     template <typename BlockGemm, bool IsFwd = true, typename RandValDramBlockWindowTmp>
     CK_TILE_HOST_DEVICE static constexpr auto
     MakeRandvalDramWindow(RandValDramBlockWindowTmp& randval_dram_block_window_tmp,
                           index_t seqlen_qk_start)
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         using BlockGemmShape                  = remove_cvref_t<typename BlockGemm::BlockGemmShape>;
         using WG                              = remove_cvref_t<decltype(config.template at<0>())>;
         constexpr index_t kMPerBlock          = BlockGemmShape::kM;
         constexpr index_t MWarp               = config.template at<1>();
         constexpr index_t NWarp               = config.template at<2>();
         constexpr bool MBwdWG16MultiIterCheck = (!IsFwd) && (!IsWG32) && (kMPerBlock > 16);
         constexpr index_t kMPerStep           = [&]() {
             if constexpr(MBwdWG16MultiIterCheck)
             {
                 return MWarp * WG::kM * 2;
             }
             else
             {
                 return MWarp * WG::kM;
             }
         }();
         constexpr index_t kNPerStep = NWarp * WG::kN;
  
         const auto block_origin  = randval_dram_block_window_tmp.get_window_origin();
         auto randval_dram_window = [&]() {
             if constexpr(IsFwd)
             {
                 return make_tile_window(
                     randval_dram_block_window_tmp.get_bottom_tensor_view(),
                     ck_tile::make_tuple(number<kMPerStep>{}, number<kNPerStep>{}),
                     {block_origin.at(number<0>{}), seqlen_qk_start}); // M/N
             }
             else
             {
                 return make_tile_window(
                     randval_dram_block_window_tmp.get_bottom_tensor_view(),
                     ck_tile::make_tuple(number<kMPerStep>{}, number<kNPerStep>{}),
                     {seqlen_qk_start, block_origin.at(number<1>{})}); // M/N
             }
         }();
  
         return randval_dram_window;
     }
  
     template <typename BlockGemm>
     CK_TILE_HOST_DEVICE static constexpr auto MakeRandValLdsBlockDescriptor()
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         using WG                    = remove_cvref_t<decltype(config.template at<0>())>;
         constexpr index_t MWarp     = config.template at<1>();
         constexpr index_t kMPerStep = MWarp * WG::kM;
         constexpr index_t kNPerStep = WG::kN;
         constexpr index_t kN1       = 8;
         constexpr index_t kN0       = kNPerStep / kN1;
  
         constexpr auto randval_lds_block_desc_0 = make_naive_tensor_descriptor(
             ck_tile::make_tuple(number<kN0>{}, number<kMPerStep>{}, number<kN1>{}),
             ck_tile::make_tuple(number<(kMPerStep + 1) * kN1>{}, number<kN1>{}, number<1>{}),
             number<kN1>{},
             number<1>{});
  
         constexpr auto randval_lds_block_desc = transform_tensor_descriptor(
             randval_lds_block_desc_0,
             ck_tile::make_tuple(
                 make_pass_through_transform(number<kMPerStep>{}),
                 make_merge_transform(ck_tile::make_tuple(number<kN0>{}, number<kN1>{}))),
             ck_tile::make_tuple(sequence<1>{}, sequence<0, 2>{}),
             ck_tile::make_tuple(sequence<0>{}, sequence<1>{}));
  
         return randval_lds_block_desc;
     }
  
     template <typename BlockGemm, bool IsFwd = true>
     CK_TILE_HOST_DEVICE static constexpr auto MakeRandValTileDistribution()
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         using BlockGemmShape                  = remove_cvref_t<typename BlockGemm::BlockGemmShape>;
         constexpr index_t kMPerBlock          = BlockGemmShape::kM;
         constexpr index_t MWarp               = config.template at<1>();
         constexpr index_t NWarp               = config.template at<2>();
         constexpr bool MBwdWG16MultiIterCheck = (!IsFwd) && (!IsWG32) && (kMPerBlock > 16);
  
         constexpr index_t MIterPerWarp = [&]() {
             if constexpr(MBwdWG16MultiIterCheck)
             {
                 return 2;
             }
             else
             {
                 return 1;
             }
         }();
         constexpr index_t NIterPerWarp = 1;
  
         constexpr auto randval_block_outer_part_dstr_encoding = tile_distribution_encoding<
             sequence<>,
             tuple<sequence<MIterPerWarp, MWarp>, sequence<NIterPerWarp, NWarp>>,
             tuple<sequence<1, 2>>,
             tuple<sequence<1, 1>>,
             sequence<1, 2>,
             sequence<0, 0>>{};
  
         // Use Bwd WarpGemm to ensure that Fwd's random values ​​are consistent with Bwd.
         // except headdim256.
         constexpr auto randval_block_inner_part_dstr_encoding = []() {
             if constexpr(std::is_same_v<typename BlockGemm::ADataType, half_t> &&
                          std::is_same_v<typename BlockGemm::BDataType, half_t> &&
                          std::is_same_v<typename BlockGemm::CDataType, float>)
             {
                 if constexpr(IsWG32)
                     return typename WarpGemmMfmaF16F16F32M32N32K16SwizzleA::CWarpDstrEncoding{};
                 else
                     return typename WarpGemmMfmaF16F16F32M16N16K16::CWarpDstrEncoding{};
             }
             else
             {
                 if constexpr(IsWG32)
                     return typename WarpGemmMfmaBf16Bf16F32M32N32K16SwizzleA::CWarpDstrEncoding{};
                 else
                     return typename WarpGemmMfmaBf16Bf16F32M16N16K16::CWarpDstrEncoding{};
             }
         }();
  
         constexpr auto randval_block_part_dstr_encode =
             detail::make_embed_tile_distribution_encoding(randval_block_outer_part_dstr_encoding,
                                                           randval_block_inner_part_dstr_encoding);
  
         return make_static_tile_distribution(randval_block_part_dstr_encode);
     }
  
     template <typename BlockGemm>
     CK_TILE_HOST_DEVICE static constexpr auto MakeRandValLdsShuffleTileDistribution()
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         using WG                = remove_cvref_t<decltype(config.template at<0>())>;
         constexpr index_t MWarp = config.template at<1>();
         constexpr index_t NWarp = config.template at<2>();
  
         constexpr index_t MIterPerWarp = 1;
         constexpr index_t NIterPerWarp = 1;
  
         constexpr auto randval_block_outer_part_dstr_encoding = tile_distribution_encoding<
             sequence<>,
             tuple<sequence<MIterPerWarp, MWarp>, sequence<NIterPerWarp, NWarp>>,
             tuple<sequence<1, 2>>,
             tuple<sequence<1, 1>>,
             sequence<1, 2>,
             sequence<0, 0>>{};
  
         constexpr auto randval_block_part_dstr_encode =
             detail::make_embed_tile_distribution_encoding(randval_block_outer_part_dstr_encoding,
                                                           typename WG::CWarpDstrEncoding{});
  
         return make_static_tile_distribution(randval_block_part_dstr_encode);
     }
  
     template <typename BlockGemm,
               typename PComputeDataType,
               typename RandValOutputDataType,
               typename PComputeWindow,
               typename RandValDramWindow>
     CK_TILE_HOST_DEVICE void Run(void* randval_ptr,
                                  const index_t start_m0_idx,
                                  const index_t start_n0_idx,
                                  PComputeWindow& p_compute,
                                  RandValDramWindow& randval_dram_window) const
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         using WG                     = remove_cvref_t<decltype(config.template at<0>())>;
         constexpr index_t MWarp      = config.template at<1>();
         constexpr index_t NWarp      = config.template at<2>();
         using BlockGemmShape         = remove_cvref_t<typename BlockGemm::BlockGemmShape>;
         constexpr index_t kMPerBlock = BlockGemmShape::kM;
         constexpr index_t kNPerBlock = BlockGemmShape::kN;
         constexpr index_t kMPerStep  = MWarp * WG::kM;
         constexpr index_t kNPerStep  = NWarp * WG::kN;
  
         // randval tile in LDS
         auto randval_lds = make_tensor_view<address_space_enum::lds>(
             reinterpret_cast<uint8_t*>(randval_ptr), MakeRandValLdsBlockDescriptor<BlockGemm>());
  
         auto randval_lds_window = make_tile_window(
             randval_lds, MakeRandValLdsBlockDescriptor<BlockGemm>().get_lengths(), {0, 0});
  
         // register distribute
         auto randval_dist_generated =
             make_static_distributed_tensor<uint8_t>(MakeRandValTileDistribution<BlockGemm>());
         static_assert(randval_dist_generated.kThreadElementSpaceSize == 16);
  
         auto randval_lds_read_window =
             make_tile_window(randval_lds_window.get_bottom_tensor_view(),
                              randval_lds_window.get_window_lengths(),
                              randval_lds_window.get_window_origin(),
                              MakeRandValLdsShuffleTileDistribution<BlockGemm>());
  
         static_for<0, kMPerBlock / kMPerStep, 1>{}([&](auto i_m0) {
             static_for<0, kNPerBlock / kNPerStep, 1>{}([&](auto i_n0) {
                 int block_row_start = (start_m0_idx / WG::kM) + (i_m0 * MWarp) + get_warp_id();
                 int block_col_start = (start_n0_idx / WG::kN) + i_n0;
                 uint2 rowcol        = make_uint2(block_row_start, block_col_start);
  
                 // generate random number
                 uint8_t random_uint8_t[16];
                 ph.get_random_16x8(random_uint8_t, reinterpret_cast<unsigned long long&>(rowcol));
  
                 constexpr auto randval_dist_generated_spans =
                     decltype(randval_dist_generated)::get_distributed_spans();
                 int i_random_idx = 0;
                 sweep_tile_span(randval_dist_generated_spans[number<0>{}], [&](auto idx0) {
                     sweep_tile_span(randval_dist_generated_spans[number<1>{}], [&](auto idx1) {
                         constexpr auto i_j_idx          = ck_tile::make_tuple(idx0, idx1);
                         randval_dist_generated(i_j_idx) = random_uint8_t[i_random_idx++];
                     });
                 });
                 // save to LDS
                 store_tile(randval_lds_window, randval_dist_generated);
                 block_sync_lds();
                 // read from LDS to register
                 auto randval                 = load_tile(randval_lds_read_window);
                 constexpr auto randval_spans = decltype(randval)::get_distributed_spans();
                 sweep_tile_span(randval_spans[number<0>{}], [&](auto idx0) {
                     sweep_tile_span(randval_spans[number<1>{}], [&](auto idx1) {
                         constexpr auto p_idx0 = tile_distributed_index<i_m0>{};
                         constexpr auto p_idx1 =
                             tile_distributed_index<i_n0, idx1.impl_.at(1), idx1.impl_.at(2)>{};
                         constexpr auto p_idx = ck_tile::make_tuple(p_idx0, p_idx1);
                         constexpr auto r_idx = ck_tile::make_tuple(idx0, idx1);
                         p_compute(p_idx)     = randval[r_idx] <= p_undrop_in_uint8_t
                                                    ? p_compute[p_idx] * rp_undrop
                                                    : PComputeDataType(0);
                     });
                 });
                 // save to Global
                 if constexpr(IsStoreRandval)
                 {
                     const auto randval_store = cast_tile<RandValOutputDataType>(randval);
                     store_tile(randval_dram_window, randval_store);
                     move_tile_window(randval_dram_window, {0, kNPerStep});
                 }
             });
             if constexpr(IsStoreRandval)
             {
                 move_tile_window(randval_dram_window, {kMPerStep, -kNPerBlock});
             }
         });
         if constexpr(IsStoreRandval)
         {
             move_tile_window(randval_dram_window, {-kMPerBlock, kNPerBlock});
         }
     }
  
     template <typename BlockGemm,
               typename RandValOutputDataType,
               typename PComputeWindow,
               typename RandValDramWindow>
     CK_TILE_HOST_DEVICE void Run(const index_t start_m0_idx,
                                  const index_t start_n0_idx,
                                  PComputeWindow& p_compute,
                                  RandValDramWindow& randval_dram_window) const
     {
         constexpr auto config =
             BlockGemm::Policy::template GetWarpGemmMWarpNWarp<typename BlockGemm::Problem>();
         using WG                               = remove_cvref_t<decltype(config.template at<0>())>;
         constexpr index_t MWarp                = config.template at<1>();
         constexpr index_t NWarp                = config.template at<2>();
         using BlockGemmShape                   = remove_cvref_t<typename BlockGemm::BlockGemmShape>;
         constexpr index_t kMPerBlock           = BlockGemmShape::kM;
         constexpr index_t kNPerBlock           = BlockGemmShape::kN;
         constexpr bool MBwdWG16MultiIterCheck  = (!IsWG32) && (kMPerBlock > 16);
         constexpr bool MBwdWG16SingleIterCheck = (!IsWG32) && (kMPerBlock == 16);
         constexpr index_t kMPerStep            = [&]() {
             if constexpr(MBwdWG16MultiIterCheck)
             {
                 return MWarp * WG::kM * 2;
             }
             else
             {
                 return MWarp * WG::kM;
             }
         }();
         constexpr index_t kNPerStep = NWarp * WG::kN;
  
         // register distribute
         auto randval = make_static_distributed_tensor<uint8_t>(
             MakeRandValTileDistribution<BlockGemm, false>());
         if constexpr(IsWG32)
             static_assert(randval.kThreadElementSpaceSize == 16);
         else
             static_assert(randval.kThreadElementSpaceSize == 4 ||
                           randval.kThreadElementSpaceSize == 8);
  
         static_for<0, kNPerBlock / kNPerStep, 1>{}([&](auto i_n0) {
             static_for<0, kMPerBlock / kMPerStep, 1>{}([&](auto i_m0) {
                 int block_row_start, block_col_start;
                 if constexpr(IsWG32)
                 {
                     block_row_start = (start_m0_idx / WG::kM) + i_m0;
                     block_col_start = (start_n0_idx / WG::kN) + (i_n0 * NWarp) + get_warp_id();
                 }
                 else
                 {
                     block_row_start = start_m0_idx / 32 + i_m0;
                     block_col_start = (start_n0_idx / 32) + get_warp_id() / 2 + i_n0 * 2;
                 }
                 uint2 rowcol = make_uint2(block_row_start, block_col_start);
  
                 // generate random number
                 uint8_t* random_uint8_t_;
                 if constexpr(MBwdWG16SingleIterCheck)
                 {
                     uint8_t random_uint8_t[4];
                     // m0t0 ~m0t15/m0t32~m0t47: 0
                     // m0t16~m0t31/m0t48~m0t63: 1
                     // m1t0 ~m1t15/m1t32~m1t47: 2
                     // m1t16~m1t31/m1t48~m1t63: 3
                     const index_t start_idx =
                         ((get_lane_id() >> 4) & 1) + (((start_m0_idx >> 4) & 1) << 1);
                     ph.get_random_4x8(
                         random_uint8_t, reinterpret_cast<unsigned long long&>(rowcol), start_idx);
                     random_uint8_t_ = random_uint8_t;
                 }
                 else if constexpr(MBwdWG16MultiIterCheck)
                 {
                     uint8_t random_uint8_t[8];
                     // t0 ~t15/t32~t47: 0
                     // t16~t31/t48~t63: 1
                     const index_t start_idx = (get_lane_id() >> 4) & 1;
                     ph.get_random_8x8(
                         random_uint8_t, reinterpret_cast<unsigned long long&>(rowcol), start_idx);
                     random_uint8_t_ = random_uint8_t;
                 }
                 else
                 {
                     uint8_t random_uint8_t[16];
                     ph.get_random_16x8(random_uint8_t,
                                        reinterpret_cast<unsigned long long&>(rowcol));
                     random_uint8_t_ = random_uint8_t;
                 }
  
                 constexpr auto randval_spans = decltype(randval)::get_distributed_spans();
                 int i_random_idx             = 0;
                 sweep_tile_span(randval_spans[number<0>{}], [&](auto idx0) {
                     sweep_tile_span(randval_spans[number<1>{}], [&](auto idx1) {
                         constexpr auto r_idx  = ck_tile::make_tuple(idx0, idx1);
                         randval(r_idx)        = random_uint8_t_[i_random_idx++];
                         constexpr auto p_idx0 = tile_distributed_index<i_m0 + idx0.impl_.at(0),
                                                                        idx0.impl_.at(1),
                                                                        idx0.impl_.at(2)>{};
                         constexpr auto p_idx1 = tile_distributed_index<i_n0>{};
                         constexpr auto p_idx  = ck_tile::make_tuple(p_idx0, p_idx1);
                         p_compute(p_idx)      = randval[r_idx] <= p_undrop_in_uint8_t
                                                     ? p_compute[p_idx]
                                                     : -p_compute[p_idx];
                     });
                 });
                 // save to Global
                 if constexpr(IsStoreRandval)
                 {
                     const auto randval_store = cast_tile<RandValOutputDataType>(randval);
                     store_tile(randval_dram_window, randval_store);
                     move_tile_window(randval_dram_window, {kMPerStep, 0});
                 }
             });
             if constexpr(IsStoreRandval)
             {
                 move_tile_window(randval_dram_window, {-kMPerBlock, kNPerStep});
             }
         });
         if constexpr(IsStoreRandval)
         {
             move_tile_window(randval_dram_window, {kMPerBlock, -kNPerBlock});
         }
     }
  
     ck_tile::philox ph;
     const float rp_undrop;
     const uint8_t p_undrop_in_uint8_t;
 };
  
 } // namespace ck_tile