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Composable Kernel: /home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-composable-kernel/checkouts/develop/include/ck_tile/ops/gemm_quant/kernel/gemm_quant_kernel.hpp Source File
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 // SPDX-License-Identifier: MIT
 // Copyright (c) 2025, Advanced Micro Devices, Inc. All rights reserved.
  
 #pragma once
  
 #include <string>
  
 #include "ck_tile/core.hpp"
 #include "ck_tile/core/algorithm/coordinate_transform.hpp"
 #include "ck_tile/core/arch/arch.hpp"
 #include "ck_tile/core/container/tuple.hpp"
 #include "ck_tile/core/numeric/integer.hpp"
 #include "ck_tile/core/numeric/math.hpp"
 #include "ck_tile/host/concat.hpp"
 #include "ck_tile/ops/gemm_quant/pipeline/tile_gemm_quant_traits.hpp"
  
 namespace ck_tile {
  
 namespace detail {
 // Helper templates for safe type extraction
 template <typename, typename Default, typename = void>
 struct get_aq_layout_or
 {
     using type = Default;
 };
  
 template <typename T, typename Default>
 struct get_aq_layout_or<T, Default, std::void_t<typename T::AQLayout>>
 {
     using type = typename T::AQLayout;
 };
  
 template <typename, typename Default, typename = void>
 struct get_bq_layout_or
 {
     using type = Default;
 };
  
 template <typename T, typename Default>
 struct get_bq_layout_or<T, Default, std::void_t<typename T::BQLayout>>
 {
     using type = typename T::BQLayout;
 };
  
 template <typename, typename Default, typename = void>
 struct get_aq_data_type_or
 {
     using type = Default;
 };
  
 template <typename T, typename Default>
 struct get_aq_data_type_or<T, Default, std::void_t<typename T::AQDataType>>
 {
     using type = typename T::AQDataType;
 };
  
 template <typename, typename Default, typename = void>
 struct get_bq_data_type_or
 {
     using type = Default;
 };
  
 template <typename T, typename Default>
 struct get_bq_data_type_or<T, Default, std::void_t<typename T::BQDataType>>
 {
     using type = typename T::BQDataType;
 };
  
 template <typename, typename = void>
 struct is_quantpreshuffle_enabled
 {
     static constexpr bool value = false;
 };
  
 template <typename T>
 struct is_quantpreshuffle_enabled<T, decltype(T::PreshuffleQuant)>
 {
     static constexpr bool value = T::PreshuffleQuant;
 };
  
 template <typename, typename = void>
 struct is_preshuffleB_enabled
 {
     static constexpr bool value = false;
 };
  
 template <typename T>
 struct is_preshuffleB_enabled<T, std::void_t<decltype(T::PreshuffleB)>>
 {
     static constexpr bool value = T::PreshuffleB;
 };
 } // namespace detail
  
 struct QuantGemmProblem
 {
     CK_TILE_HOST QuantGemmProblem() = default;
     CK_TILE_HOST QuantGemmProblem(index_t M_,
                                   index_t N_,
                                   index_t K_,
                                   index_t QK_A_,
                                   index_t QK_B_,
                                   index_t stride_A_,
                                   index_t stride_B_,
                                   index_t stride_C_,
                                   index_t stride_AQ_,
                                   index_t stride_BQ_)
         : M(M_),
           N(N_),
           K(K_),
           QK_A(QK_A_),
           QK_B(QK_B_),
           stride_A(stride_A_),
           stride_B(stride_B_),
           stride_C(stride_C_),
           stride_AQ(stride_AQ_),
           stride_BQ(stride_BQ_)
     {
     }
  
     index_t M;
     index_t N;
     index_t K;
     index_t QK_A;
     index_t QK_B;
     index_t stride_A;
     index_t stride_B;
     index_t stride_C;
     index_t stride_AQ;
     index_t stride_BQ;
 };
  
 struct QuantGemmHostArgs : public QuantGemmProblem
 {
     CK_TILE_HOST QuantGemmHostArgs() = default;
     CK_TILE_HOST QuantGemmHostArgs(const void* a_ptr_,
                                    const void* b_ptr_,
                                    void* c_ptr_,
                                    const void* aq_ptr_,
                                    const void* bq_ptr_,
                                    index_t k_batch_,
                                    index_t M_,
                                    index_t N_,
                                    index_t K_,
                                    index_t QK_A_,
                                    index_t QK_B_,
                                    index_t stride_A_,
                                    index_t stride_B_,
                                    index_t stride_C_,
                                    index_t stride_AQ_,
                                    index_t stride_BQ_)
         : QuantGemmProblem(
               M_, N_, K_, QK_A_, QK_B_, stride_A_, stride_B_, stride_C_, stride_AQ_, stride_BQ_),
           a_ptr(a_ptr_),
           b_ptr(b_ptr_),
           aq_ptr(aq_ptr_),
           bq_ptr(bq_ptr_),
           c_ptr(c_ptr_),
           k_batch(k_batch_)
     {
     }
  
     const void* a_ptr  = nullptr;
     const void* b_ptr  = nullptr;
     const void* aq_ptr = nullptr;
     const void* bq_ptr = nullptr;
     void* c_ptr        = nullptr;
     index_t k_batch    = 0;
 };
  
 struct QuantGemmKernelArgs
 {
     const void* a_ptr;
     const void* b_ptr;
     const void* aq_ptr;
     const void* bq_ptr;
     void* c_ptr;
     index_t M;
     index_t N;
     index_t K;
     index_t QK_A;
     index_t QK_B;
     index_t stride_A;
     index_t stride_B;
     index_t stride_C;
     index_t stride_AQ;
     index_t stride_BQ;
     index_t k_batch;
 };
  
 template <typename TilePartitioner_,
           typename GemmPipeline_,
           typename EpiloguePipeline_,
           QuantType QuantType_>
 struct QuantGemmKernel
 {
     using TilePartitioner  = remove_cvref_t<TilePartitioner_>;
     using GemmPipeline     = remove_cvref_t<GemmPipeline_>;
     using EpiloguePipeline = remove_cvref_t<EpiloguePipeline_>;
     using ALayout          = remove_cvref_t<typename GemmPipeline::ALayout>;
     using BLayout          = remove_cvref_t<typename GemmPipeline::BLayout>;
     using CLayout          = remove_cvref_t<typename GemmPipeline::CLayout>;
  
     using AQLayout = remove_cvref_t<
         typename detail::get_aq_layout_or<GemmPipeline, typename GemmPipeline::ALayout>::type>;
     using BQLayout = remove_cvref_t<
         typename detail::get_bq_layout_or<GemmPipeline, typename GemmPipeline::BLayout>::type>;
  
     static constexpr index_t kBlockSize = GemmPipeline::BlockSize;
     static constexpr bool PreshuffleQuant =
         detail::is_quantpreshuffle_enabled<GemmPipeline_>::value;
     static constexpr bool PreshuffleB = detail::is_preshuffleB_enabled<GemmPipeline_>::value;
  
     using ADataType   = remove_cvref_t<typename GemmPipeline::ADataType>;
     using BDataType   = remove_cvref_t<typename GemmPipeline::BDataType>;
     using CDataType   = remove_cvref_t<typename EpiloguePipeline::ODataType>;
     using AccDataType = remove_cvref_t<typename EpiloguePipeline::AccDataType>;
  
     using AQDataType =
         remove_cvref_t<typename detail::get_aq_data_type_or<GemmPipeline, AccDataType>::type>;
     using BQDataType =
         remove_cvref_t<typename detail::get_bq_data_type_or<GemmPipeline, AccDataType>::type>;
  
     static constexpr auto I0 = number<0>(); // A Tensor
     static constexpr auto I1 = number<1>(); // AQ Tensor
     static constexpr auto I2 = number<2>(); // B Tensor
     static constexpr auto I3 = number<3>(); // BQ Tensor
     static constexpr auto I4 = number<4>(); // C Tensor
  
     static constexpr auto kQuantType = QuantType_;
  
     [[nodiscard]] CK_TILE_HOST static const std::string GetName()
     {
         // clang-format off
         return concat('_', "gemm_quant", gemm_prec_str<ADataType, BDataType>, GemmPipeline::GetName());
         // clang-format on
     }
  
     CK_TILE_HOST static constexpr auto GridSize(index_t M, index_t N, index_t KBatch)
     {
         return dim3(TilePartitioner::GridSize(M, N), 1, KBatch);
     }
  
     CK_TILE_HOST static constexpr auto BlockSize() { return dim3(kBlockSize); }
  
     CK_TILE_HOST static constexpr QuantGemmKernelArgs
     MakeKernelArgs(const QuantGemmHostArgs& hostArgs)
     {
         return QuantGemmKernelArgs{hostArgs.a_ptr,
                                    hostArgs.b_ptr,
                                    hostArgs.aq_ptr,
                                    hostArgs.bq_ptr,
                                    hostArgs.c_ptr,
                                    hostArgs.M,
                                    hostArgs.N,
                                    hostArgs.K,
                                    hostArgs.QK_A,
                                    hostArgs.QK_B,
                                    hostArgs.stride_A,
                                    hostArgs.stride_B,
                                    hostArgs.stride_C,
                                    hostArgs.stride_AQ,
                                    hostArgs.stride_BQ,
                                    hostArgs.k_batch};
     }
  
     CK_TILE_HOST_DEVICE static constexpr index_t GetSmemSize()
     {
         return max(GemmPipeline::GetSmemSize(), EpiloguePipeline::GetSmemSize());
     }
  
     struct SplitKBatchOffset
     {
         __device__ SplitKBatchOffset(const QuantGemmKernelArgs& kargs,
                                      const std::size_t k_id = blockIdx.z)
         {
             constexpr auto K1   = TilePartitioner::BlockGemmShape::WarpTile::at(I2);
             const index_t K_t   = amd_wave_read_first_lane(kargs.k_batch * K1);
             const index_t KRead = amd_wave_read_first_lane((kargs.K + K_t - 1) / K_t * K1);
  
             if constexpr(std::is_same_v<tensor_layout::gemm::RowMajor, ALayout>)
             {
                 a_k_split_offset = amd_wave_read_first_lane(k_id * KRead);
             }
             else if constexpr(std::is_same_v<tensor_layout::gemm::ColumnMajor, ALayout>)
             {
                 a_k_split_offset = amd_wave_read_first_lane(k_id * KRead * kargs.stride_A);
             }
  
             if constexpr(std::is_same_v<tensor_layout::gemm::RowMajor, BLayout>)
             {
                 b_k_split_offset = amd_wave_read_first_lane(k_id * KRead * kargs.stride_B);
             }
             else if constexpr(std::is_same_v<tensor_layout::gemm::ColumnMajor, BLayout>)
             {
                 b_k_split_offset = amd_wave_read_first_lane(k_id * KRead);
             }
  
             if(k_id < static_cast<uint32_t>(kargs.k_batch - 1))
             {
                 splitted_k = amd_wave_read_first_lane(KRead);
             }
             else
             {
                 splitted_k = amd_wave_read_first_lane(kargs.K - KRead * (kargs.k_batch - 1));
             }
         }
  
         index_t a_k_split_offset;
         index_t b_k_split_offset;
         index_t splitted_k;
     };
  
     CK_TILE_HOST static bool IsSupportedArgument(const QuantGemmKernelArgs& kargs)
     {
         if(kargs.k_batch != 1)
         {
             if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
             {
                 CK_TILE_ERROR("Conditions not met for Kbatch >1 !");
             }
             return false;
         }
  
         if constexpr(kQuantType == QuantType::AQuantGrouped)
         {
             static_assert(std::is_same_v<AQLayout, tensor_layout::gemm::RowMajor>);
             if(kargs.QK_A % GemmPipeline::GetVectorSizeAQ() != 0)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR("K_A is not a multiple of vector load size for A tensor!");
                 }
                 return false;
             }
         }
  
         if constexpr(kQuantType == QuantType::BQuantGrouped)
         {
             static_assert(std::is_same_v<BQLayout, tensor_layout::gemm::ColumnMajor>);
             if(kargs.QK_B % GemmPipeline::GetVectorSizeBQ() != 0)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR("K_B is not a multiple of vector load size for B tensor!");
                 }
                 return false;
             }
         }
  
         if constexpr(std::is_same_v<ALayout, tensor_layout::gemm::RowMajor>)
         {
             if(kargs.K % (TilePartitioner::KPerBlock * kargs.k_batch) != 0 &&
                GemmPipeline::kPadK == false)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR("Can't support K that is not a multiple of k_batch * KPerBlock "
                                   "without padding!");
                 }
                 return false;
             }
             if(kargs.K % GemmPipeline::GetVectorSizeA() != 0)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR("K is not a multiple of vector load size for A tensor!");
                 }
                 return false;
             }
         }
         else
         {
             if(kargs.M % TilePartitioner::MPerBlock != 0 && GemmPipeline::kPadM == false)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR(
                         "Can't support M that is not a multiple of MPerBlock without padding!");
                 }
                 return false;
             }
             if(kargs.M % GemmPipeline::GetVectorSizeA() != 0)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR("M is not a multiple of vector load size for A tensor!");
                 }
                 return false;
             }
         }
  
         if constexpr(std::is_same_v<BLayout, tensor_layout::gemm::RowMajor>)
         {
             if(kargs.N % TilePartitioner::NPerBlock != 0 && GemmPipeline::kPadN == false)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR(
                         "Can't support N that is not a multiple of NPerBlock without padding!");
                 }
                 return false;
             }
             if(kargs.N % GemmPipeline::GetVectorSizeB() != 0)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR("N is not a multiple of vector load size for B tensor!");
                 }
                 return false;
             }
         }
         else
         {
             if(kargs.K % (TilePartitioner::KPerBlock * kargs.k_batch) != 0 &&
                GemmPipeline::kPadK == false)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR("Can't support K that is not a multiple of k_batch * KPerBlock "
                                   "without padding!");
                 }
                 return false;
             }
             if(kargs.K % GemmPipeline::GetVectorSizeB() != 0)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR("K is not a multiple of vector load size for B tensor!");
                 }
                 return false;
             }
         }
  
         if constexpr(std::is_same_v<CLayout, tensor_layout::gemm::RowMajor>)
         {
             if(kargs.N % TilePartitioner::NPerBlock != 0 && GemmPipeline::kPadN == false)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR(
                         "Can't support N that is not a multiple of NPerBlock without padding!");
                 }
                 return false;
             }
             if(kargs.N % EpiloguePipeline::GetVectorSizeC() != 0)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR("N is not a multiple of vector load size for C tensor!");
                 }
                 return false;
             }
         }
         else
         {
             if(kargs.M % TilePartitioner::MPerBlock != 0 && GemmPipeline::kPadM == false)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR(
                         "Can't support M that is not a multiple of MPerBlock without padding!");
                 }
                 return false;
             }
             if(kargs.M % EpiloguePipeline::GetVectorSizeC() != 0)
             {
                 if(ck_tile::EnvIsEnabled(CK_TILE_ENV(CK_TILE_LOGGING)))
                 {
                     CK_TILE_ERROR("M is not a multiple of vector load size for C tensor!");
                 }
                 return false;
             }
         }
         return true;
     }
  
     template <memory_operation_enum DstInMemOp = memory_operation_enum::set>
     CK_TILE_DEVICE static auto MakeGemmTensorViews(const ADataType* a_ptr,
                                                    const BDataType* b_ptr,
                                                    const AQDataType* aq_ptr,
                                                    const BQDataType* bq_ptr,
                                                    CDataType* c_ptr,
                                                    const QuantGemmKernelArgs& kargs,
                                                    const SplitKBatchOffset& splitk_batch_offset)
     {
         static_assert(!TilePartitioner::BlockGemmShape::PermuteA, "Not implemented!");
         const auto& a_tensor_view = [&]() {
             if constexpr(std::is_same_v<ALayout, tensor_layout::gemm::RowMajor>)
             {
                 return make_naive_tensor_view<address_space_enum::global>(
                     a_ptr,
                     make_tuple(kargs.M, splitk_batch_offset.splitted_k),
                     make_tuple(kargs.stride_A, 1),
                     number<GemmPipeline::GetVectorSizeA()>{},
                     number<1>{});
             }
             else
             {
                 return make_naive_tensor_view<address_space_enum::global>(
                     a_ptr,
                     make_tuple(splitk_batch_offset.splitted_k, kargs.M),
                     make_tuple(kargs.stride_A, 1),
                     number<GemmPipeline::GetVectorSizeA()>{},
                     number<1>{});
             }
         }();
  
         const auto get_padding_size = [](index_t length, index_t alignment) {
             return ck_tile::integer_least_multiple(length, alignment) - length;
         };
  
         const auto& aq_tensor_view = [&]() {
             if constexpr(kQuantType == QuantType::AQuantGrouped && PreshuffleQuant)
             {
                 static_assert(std::is_same_v<AQLayout, tensor_layout::gemm::RowMajor>);
                 const auto aq_x = kargs.M * GemmPipeline::KPerBlockAQ;
                 const auto aq_y = kargs.QK_A / GemmPipeline::KPerBlockAQ;
  
                 const auto aq_desc =
                     make_naive_tensor_descriptor(make_tuple(aq_y, aq_x),
                                                  make_tuple(aq_x, 1),
                                                  number<GemmPipeline::GetVectorSizeAQ()>{},
                                                  number<1>{});
  
                 const auto block_tile_size = GemmPipeline::MPerBlock * GemmPipeline::KPerBlockAQ;
                 const auto aq_pad0_desc    = transform_tensor_descriptor(
                     aq_desc,
                     make_tuple(
                         make_pass_through_transform(aq_y),
                         make_right_pad_transform(aq_x, get_padding_size(aq_x, block_tile_size))),
                     make_tuple(sequence<0>{}, sequence<1>{}),
                     make_tuple(sequence<0>{}, sequence<1>{}));
  
                 const auto pad_aq_x = aq_pad0_desc.get_lengths()[I1];
                 const auto wave_tile_size =
                     TilePartitioner::BlockGemmShape::WarpTile::at(I0) * GemmPipeline::KPerBlockAQ;
                 const auto wave_tile_count_x =
                     ck_tile::integer_divide_ceil(pad_aq_x, wave_tile_size);
                 const auto aq_unmerge_pad0_desc = transform_tensor_descriptor(
                     aq_pad0_desc,
                     make_tuple(
                         make_pass_through_transform(aq_y),
                         make_unmerge_transform(make_tuple(wave_tile_count_x, wave_tile_size))),
                     make_tuple(sequence<0>{}, sequence<1>{}),
                     make_tuple(sequence<0>{}, sequence<1, 2>{}));
  
                 const auto aq_pad1_desc = transform_tensor_descriptor(
                     aq_unmerge_pad0_desc,
                     make_tuple(
                         make_pass_through_transform(aq_y),
                         make_pass_through_transform(wave_tile_count_x),
                         make_right_pad_transform(
                             wave_tile_size, get_padding_size(wave_tile_size, get_warp_size()))),
                     make_tuple(sequence<0>{}, sequence<1>{}, sequence<2>{}),
                     make_tuple(sequence<0>{}, sequence<1>{}, sequence<2>{}));
  
                 const auto pad_wave_size =
                     ck_tile::integer_least_multiple(wave_tile_size, get_warp_size());
                 const auto aq_merge_pad1_desc = transform_tensor_descriptor(
                     aq_pad1_desc,
                     make_tuple(make_merge_transform(make_tuple(aq_y, wave_tile_count_x)),
                                make_pass_through_transform(pad_wave_size)),
                     make_tuple(sequence<0, 1>{}, sequence<2>{}),
                     make_tuple(sequence<0>{}, sequence<1>{}));
  
                 return make_tensor_view<address_space_enum::global>(aq_ptr, aq_merge_pad1_desc);
             }
             else if constexpr(kQuantType == QuantType::AQuantGrouped && !PreshuffleQuant)
             {
                 static_assert(std::is_same_v<AQLayout, tensor_layout::gemm::RowMajor>);
                 return make_naive_tensor_view<address_space_enum::global>(
                     aq_ptr,
                     make_tuple(kargs.M, kargs.QK_A),
                     make_tuple(kargs.stride_AQ, 1),
                     number<GemmPipeline::GetVectorSizeAQ()>{},
                     number<1>{});
             }
             else if constexpr(kQuantType == QuantType::RowColQuant)
             {
                 return make_naive_tensor_view<address_space_enum::global>(
                     aq_ptr,
                     make_tuple(kargs.M, kargs.N),
                     make_tuple(1, 0), // broadcasting over n
                     number<1>{},
                     number<1>{});
             }
             else
             {
                 return nullptr; // TODO: use some other "empty" type for this
             }
         }();
  
         const auto& b_tensor_view = [&]() {
             if constexpr(std::is_same_v<BLayout, tensor_layout::gemm::RowMajor>)
             {
                 if constexpr(TilePartitioner::BlockGemmShape::PermuteB)
                 {
                     constexpr index_t K1          = GemmPipeline::GetSmemPackB();
                     const index_t K0              = splitk_batch_offset.splitted_k / K1;
                     constexpr index_t VectorSizeB = std::min(K1, GemmPipeline::GetVectorSizeB());
                     const auto b_k0_n_k1_desc =
                         make_naive_tensor_descriptor(make_tuple(K0, kargs.N, K1),
                                                      make_tuple(kargs.N * K1, K1, I1),
                                                      number<VectorSizeB>{},
                                                      number<1>{});
                     const auto b_n_k_desc = transform_tensor_descriptor(
                         b_k0_n_k1_desc,
                         make_tuple(make_merge_transform(make_tuple(K0, K1)),
                                    make_pass_through_transform(kargs.N)),
                         make_tuple(sequence<0, 2>{}, sequence<1>{}),
                         make_tuple(sequence<0>{}, sequence<1>{}));
                     return make_tensor_view<address_space_enum::global>(b_ptr, b_n_k_desc);
                 }
                 else
                 {
                     return make_naive_tensor_view<address_space_enum::global>(
                         b_ptr,
                         make_tuple(splitk_batch_offset.splitted_k, kargs.N),
                         make_tuple(kargs.stride_B, 1),
                         number<GemmPipeline::GetVectorSizeB()>{},
                         number<1>{});
                 }
             }
             else
             {
                 if constexpr(TilePartitioner::BlockGemmShape::PermuteB)
                 {
                     constexpr index_t K1          = GemmPipeline::GetSmemPackB();
                     const index_t K0              = splitk_batch_offset.splitted_k / K1;
                     constexpr index_t VectorSizeB = std::min(K1, GemmPipeline::GetVectorSizeB());
                     const auto b_k0_n_k1_desc =
                         make_naive_tensor_descriptor(make_tuple(K0, kargs.N, K1),
                                                      make_tuple(kargs.N * K1, K1, I1),
                                                      number<VectorSizeB>{},
                                                      number<1>{});
                     const auto b_n_k_desc = transform_tensor_descriptor(
                         b_k0_n_k1_desc,
                         make_tuple(make_merge_transform(make_tuple(K0, K1)),
                                    make_pass_through_transform(kargs.N)),
                         make_tuple(sequence<0, 2>{}, sequence<1>{}),
                         make_tuple(sequence<1>{}, sequence<0>{}));
                     return make_tensor_view<address_space_enum::global>(b_ptr, b_n_k_desc);
                 }
                 else
                 {
                     if constexpr(PreshuffleB)
                     {
                         index_t kFlatK =
                             GemmPipeline::flatKPerWarp *
                             (splitk_batch_offset.splitted_k /
                              TilePartitioner::BlockGemmShape::WarpTile::at(number<2>{}));
                         index_t kFlatN = kargs.N * kargs.K / kFlatK;
  
                         return make_naive_tensor_view<address_space_enum::global>(
                             b_ptr,
                             make_tuple(kFlatN, kFlatK),
                             make_tuple(kFlatK, 1),
                             number<GemmPipeline::GetVectorSizeB()>{},
                             number<1>{});
                     }
                     else
                     {
                         return make_naive_tensor_view<address_space_enum::global>(
                             b_ptr,
                             make_tuple(kargs.N, splitk_batch_offset.splitted_k),
                             make_tuple(kargs.stride_B, 1),
                             number<GemmPipeline::GetVectorSizeB()>{},
                             number<1>{});
                     }
                 }
             }
         }();
  
         const auto& bq_tensor_view = [&]() {
             if constexpr(kQuantType == QuantType::RowColQuant)
             {
                 return make_naive_tensor_view<address_space_enum::global>(
                     bq_ptr,
                     make_tuple(kargs.M, kargs.N),
                     make_tuple(0, 1), // broadcasting over m
                     number<1>{},
                     number<1>{});
             }
             else if constexpr(kQuantType == QuantType::BQuantGrouped)
             {
                 static_assert(std::is_same_v<BQLayout, tensor_layout::gemm::ColumnMajor>);
                 return make_naive_tensor_view<address_space_enum::global>(
                     bq_ptr,
                     make_tuple(kargs.N, kargs.QK_B),
                     make_tuple(kargs.stride_BQ, 1),
                     number<GemmPipeline::GetVectorSizeBQ()>{},
                     number<1>{});
             }
             else
             {
                 return nullptr; // TODO: use some other "empty" type for this
             }
         }();
  
         // TODO: enable vector write for C in ColMajor
         const auto& c_tensor_view = [&]() {
             if constexpr(std::is_same_v<CLayout, tensor_layout::gemm::RowMajor>)
             {
                 return make_naive_tensor_view<address_space_enum::global, DstInMemOp>(
                     c_ptr,
                     make_tuple(kargs.M, kargs.N),
                     make_tuple(kargs.stride_C, 1),
                     number<EpiloguePipeline::GetVectorSizeC()>{},
                     number<1>{});
             }
             else
             {
                 return make_naive_tensor_view<address_space_enum::global, DstInMemOp>(
                     c_ptr,
                     make_tuple(kargs.M, kargs.N),
                     make_tuple(1, kargs.stride_C),
                     number<1>{},
                     number<1>{});
             }
         }();
  
         return make_tuple(
             a_tensor_view, aq_tensor_view, b_tensor_view, bq_tensor_view, c_tensor_view);
     }
  
     template <typename TensorView>
     CK_TILE_DEVICE static auto MakeGemmPadViews(const TensorView& views)
     {
         const auto& a_pad_view = [&]() {
             const auto& a_tensor_view = views.at(I0);
             if constexpr(std::is_same_v<ALayout, tensor_layout::gemm::RowMajor>)
             {
                 return pad_tensor_view(a_tensor_view,
                                        make_tuple(number<TilePartitioner::MPerBlock>{},
                                                   number<TilePartitioner::KPerBlock>{}),
                                        sequence<false, GemmPipeline::kPadK>{});
             }
             else
             {
                 return pad_tensor_view(a_tensor_view,
                                        make_tuple(number<TilePartitioner::KPerBlock>{},
                                                   number<TilePartitioner::MPerBlock>{}),
                                        sequence<false, GemmPipeline::kPadM>{});
             }
         }();
  
         // no padding
         const auto& aq_pad_view = [&]() { return views.at(I1); }();
  
         const auto& b_flat_view = views.at(I2); // not applying any padding to flat B view
  
         const auto& b_pad_view = [&]() {
             const auto& b_tensor_view = views.at(I2);
             if constexpr(std::is_same_v<BLayout, tensor_layout::gemm::ColumnMajor>)
             {
                 return pad_tensor_view(b_tensor_view,
                                        make_tuple(number<TilePartitioner::NPerBlock>{},
                                                   number<TilePartitioner::KPerBlock>{}),
                                        sequence<false, GemmPipeline::kPadK>{});
             }
             else
             {
                 return pad_tensor_view(b_tensor_view,
                                        make_tuple(number<TilePartitioner::KPerBlock>{},
                                                   number<TilePartitioner::NPerBlock>{}),
                                        sequence<false, GemmPipeline::kPadN>{});
             }
         }();
  
         // no padding
         const auto& bq_pad_view = [&]() { return views.at(I3); }();
  
         // TODO vector write in for C in ColMajor
         const auto& c_pad_view = [&]() {
             const auto& c_tensor_view = views.at(I4);
             if constexpr(std::is_same_v<CLayout, tensor_layout::gemm::RowMajor>)
             {
                 return pad_tensor_view(c_tensor_view,
                                        make_tuple(number<TilePartitioner::MPerBlock>{},
                                                   number<TilePartitioner::NPerBlock>{}),
                                        sequence<false, GemmPipeline::kPadN>{});
             }
             else
             {
                 return pad_tensor_view(c_tensor_view,
                                        make_tuple(number<TilePartitioner::MPerBlock>{},
                                                   number<TilePartitioner::NPerBlock>{}),
                                        sequence<GemmPipeline::kPadM, false>{});
             }
         }();
         if constexpr(PreshuffleB)
         {
             return make_tuple(a_pad_view, aq_pad_view, b_flat_view, bq_pad_view, c_pad_view);
         }
         else
         {
             return make_tuple(a_pad_view, aq_pad_view, b_pad_view, bq_pad_view, c_pad_view);
         }
     }
  
     template <typename PadView>
     CK_TILE_DEVICE static auto
     MakeGemmTileWindows(const PadView& views, const index_t i_m, const index_t i_n)
     {
         const auto& a_pad_view     = views.at(I0);
         const auto& aq_pad_view    = views.at(I1);
         const auto& b_pad_view     = views.at(I2);
         const auto& bq_pad_view    = views.at(I3);
         const auto& c_pad_view     = views.at(I4);
         const auto& a_block_window = [&]() {
             if constexpr(std::is_same_v<ALayout, tensor_layout::gemm::RowMajor>)
             {
                 return make_tile_window(a_pad_view,
                                         make_tuple(number<TilePartitioner::MPerBlock>{},
                                                    number<TilePartitioner::KPerBlock>{}),
                                         {i_m, 0});
             }
             else
             {
                 return make_tile_window(a_pad_view,
                                         make_tuple(number<TilePartitioner::KPerBlock>{},
                                                    number<TilePartitioner::MPerBlock>{}),
                                         {0, i_m});
             }
         }();
  
         const auto& aq_block_window = [&]() {
             if constexpr(kQuantType == QuantType::AQuantGrouped && PreshuffleQuant)
             {
                 static_assert(std::is_same_v<AQLayout, tensor_layout::gemm::RowMajor>);
                 constexpr auto block_m = TilePartitioner::MPerBlock;
                 constexpr auto warp_m  = TilePartitioner::BlockGemmShape::WarpTile::at(I0);
                 constexpr auto aqk_per_block =
                     TilePartitioner::KPerBlock / GemmPipeline::QuantGroupSize;
                 constexpr auto tile_window_width =
                     ck_tile::integer_least_multiple(warp_m * aqk_per_block, get_warp_size());
                 constexpr auto tile_window_height = block_m / warp_m;
                 auto block_m_idx                  = i_m / block_m;
                 return make_tile_window(
                     aq_pad_view,
                     make_tuple(number<tile_window_height>{}, number<tile_window_width>{}),
                     {block_m_idx * tile_window_height, 0});
             }
             else if constexpr(kQuantType == QuantType::AQuantGrouped && !PreshuffleQuant)
             {
                 static_assert(std::is_same_v<AQLayout, tensor_layout::gemm::RowMajor>);
                 constexpr auto block_m = TilePartitioner::MPerBlock;
                 constexpr auto block_k = TilePartitioner::KPerBlock;
                 return make_tile_window(
                     aq_pad_view,
                     make_tuple(number<block_m>{}, number<block_k / GemmPipeline::QuantGroupSize>{}),
                     {i_m, 0});
             }
             else if constexpr(kQuantType == QuantType::RowColQuant)
             {
                 return make_tile_window(aq_pad_view,
                                         make_tuple(number<TilePartitioner::MPerBlock>{},
                                                    number<TilePartitioner::NPerBlock>{}),
                                         {i_m, i_n});
             }
             else
             {
                 return nullptr; // TODO: use some other "empty" type?
             }
         }();
  
         const auto& b_block_window = [&]() {
             if constexpr(PreshuffleB)
             {
                 return make_tile_window(
                     b_pad_view,
                     make_tuple(number<GemmPipeline::flatNPerWarp>{},
                                number<GemmPipeline::flatKPerWarp>{}),
                     {static_cast<int>(i_n / TilePartitioner::BlockGemmShape::WarpTile::at(I1)), 0});
             }
             else
             {
                 if constexpr(std::is_same_v<BLayout, tensor_layout::gemm::ColumnMajor>)
                 {
                     return make_tile_window(b_pad_view,
                                             make_tuple(number<TilePartitioner::NPerBlock>{},
                                                        number<TilePartitioner::KPerBlock>{}),
                                             {i_n, 0});
                 }
                 else
                 {
                     return make_tile_window(b_pad_view,
                                             make_tuple(number<TilePartitioner::KPerBlock>{},
                                                        number<TilePartitioner::NPerBlock>{}),
                                             {0, i_n});
                 }
             }
         }();
  
         const auto& bq_block_window = [&]() {
             if constexpr(kQuantType == QuantType::RowColQuant)
             {
                 return make_tile_window(bq_pad_view,
                                         make_tuple(number<TilePartitioner::MPerBlock>{},
                                                    number<TilePartitioner::NPerBlock>{}),
                                         {i_m, i_n});
             }
             else if constexpr(kQuantType == QuantType::BQuantGrouped)
             {
                 static_assert(std::is_same_v<BQLayout, tensor_layout::gemm::ColumnMajor>);
                 return make_tile_window(
                     bq_pad_view,
                     make_tuple(number<TilePartitioner::NPerBlock>{},
                                number<TilePartitioner::KPerBlock / GemmPipeline::QuantGroupSize>{}),
                     {i_n, 0});
             }
             else
             {
                 return nullptr; // TODO: use some other "empty" type here
             }
         }();
  
         auto c_block_window = make_tile_window(
             c_pad_view,
             make_tuple(number<TilePartitioner::MPerBlock>{}, number<TilePartitioner::NPerBlock>{}),
             {i_m, i_n});
  
         return make_tuple(
             a_block_window, aq_block_window, b_block_window, bq_block_window, c_block_window);
     }
  
     template <memory_operation_enum DstInMemOp = memory_operation_enum::set>
     CK_TILE_DEVICE static void RunGemm(const ADataType* a_ptr,
                                        const BDataType* b_ptr,
                                        const AQDataType* aq_ptr,
                                        const BQDataType* bq_ptr,
                                        CDataType* c_ptr,
                                        void* smem_ptr_0,
                                        const QuantGemmKernelArgs& kargs,
                                        const SplitKBatchOffset& splitk_batch_offset,
                                        const index_t block_idx_m,
                                        const index_t block_idx_n)
     {
         // Create Gemm tensor views, pad views and tile windows
         const auto& gemm_tensor_views_tuple = MakeGemmTensorViews<DstInMemOp>(
             a_ptr, b_ptr, aq_ptr, bq_ptr, c_ptr, kargs, splitk_batch_offset);
  
         const auto& gemm_pad_views = MakeGemmPadViews(gemm_tensor_views_tuple);
         auto gemm_tile_windows     = MakeGemmTileWindows(gemm_pad_views, block_idx_m, block_idx_n);
  
         const index_t num_loop =
             amd_wave_read_first_lane(TilePartitioner::GetLoopNum(splitk_batch_offset.splitted_k));
  
         // Run GEMM cooperatively by whole workgroup.
         const auto& a_block_window = gemm_tile_windows.at(I0);
         const auto& b_block_window = gemm_tile_windows.at(I2);
  
         const auto& c_block_tile = [&]() {
             if constexpr(kQuantType == QuantType::AQuantGrouped)
             {
                 const auto& aq_block_window = gemm_tile_windows.at(I1);
                 return GemmPipeline{}.template operator()(
                     a_block_window, b_block_window, aq_block_window, kargs.M, num_loop, smem_ptr_0);
             }
             else if constexpr(kQuantType == QuantType::BQuantGrouped)
             {
                 const auto& bq_block_window = gemm_tile_windows.at(I3);
                 return GemmPipeline{}.template operator()(
                     a_block_window, b_block_window, bq_block_window, num_loop, smem_ptr_0);
             }
             else if constexpr(kQuantType == QuantType::RowColQuant ||
                               kQuantType == QuantType::TensorQuant)
             {
                 return GemmPipeline{}.template operator()(
                     a_block_window, b_block_window, num_loop, smem_ptr_0);
             }
         }();
  
         // Run Epilogue Pipeline
         auto& c_block_window = gemm_tile_windows.at(I4);
  
         if constexpr(kQuantType == QuantType::AQuantGrouped ||
                      kQuantType == QuantType::BQuantGrouped)
         {
             EpiloguePipeline{}(c_block_window, c_block_tile, c_block_window, smem_ptr_0);
         }
         else if constexpr(kQuantType == QuantType::RowColQuant)
         {
             const auto& aq_block_window = gemm_tile_windows.at(I1);
             const auto& bq_block_window = gemm_tile_windows.at(I3);
             EpiloguePipeline{}(c_block_window,
                                c_block_tile,
                                c_block_window,
                                smem_ptr_0,
                                aq_block_window,
                                bq_block_window);
         }
         else if constexpr(kQuantType == QuantType::TensorQuant)
         {
             // TODO: why doesn't readfirstlane work here?
             // const AccDataType aq_scale =
             //     __builtin_amdgcn_readfirstlane(type_convert<AccDataType>(*aq_ptr));
             // const AccDataType bq_scale =
             //     __builtin_amdgcn_readfirstlane(type_convert<AccDataType>(*bq_ptr));
             const AccDataType aq_scale = type_convert<AccDataType>(*aq_ptr);
             const AccDataType bq_scale = type_convert<AccDataType>(*bq_ptr);
             EpiloguePipeline{}(
                 c_block_window, c_block_tile, c_block_window, smem_ptr_0, aq_scale, bq_scale);
         }
     }
     template <memory_operation_enum DstInMemOp = memory_operation_enum::set>
     CK_TILE_DEVICE static void RunGemm2LDS(const ADataType* a_ptr,
                                            const BDataType* b_ptr,
                                            const AQDataType* aq_ptr,
                                            const BQDataType* bq_ptr,
                                            CDataType* c_ptr,
                                            void* smem_ptr_0,
                                            void* smem_ptr_1,
                                            const QuantGemmKernelArgs& kargs,
                                            const SplitKBatchOffset& splitk_batch_offset,
                                            const index_t block_idx_m,
                                            const index_t block_idx_n)
     {
         // Create Gemm tensor views, pad views and tile windows
         const auto& gemm_tensor_views_tuple = MakeGemmTensorViews<DstInMemOp>(
             a_ptr, b_ptr, aq_ptr, bq_ptr, c_ptr, kargs, splitk_batch_offset);
  
         const auto& gemm_pad_views = MakeGemmPadViews(gemm_tensor_views_tuple);
         auto gemm_tile_windows     = MakeGemmTileWindows(gemm_pad_views, block_idx_m, block_idx_n);
  
         const index_t num_loop = __builtin_amdgcn_readfirstlane(
             TilePartitioner::GetLoopNum(splitk_batch_offset.splitted_k));
  
         // Run GEMM cooperatively by whole workgroup.
         const auto& a_block_window = gemm_tile_windows.at(I0);
         const auto& b_block_window = gemm_tile_windows.at(I2);
  
         const auto& c_block_tile = [&]() {
             if constexpr(kQuantType == QuantType::BQuantGrouped)
             {
                 const auto& bq_block_window = gemm_tile_windows.at(I3);
                 return GemmPipeline{}.template operator()(a_block_window,
                                                           b_block_window,
                                                           bq_block_window,
                                                           num_loop,
                                                           smem_ptr_0,
                                                           smem_ptr_1);
             }
             else
             {
                 return nullptr;
             }
         }();
  
         // Run Epilogue Pipeline
         auto& c_block_window = gemm_tile_windows.at(I4);
  
         if constexpr(kQuantType == QuantType::BQuantGrouped)
         {
             EpiloguePipeline{}(c_block_window, c_block_tile, c_block_window, smem_ptr_0);
         }
         else
         {
             return;
             // throw std::runtime_error("DoubleSmemBuffer Not implemented for AQuantGrouped or
             // RowColQuant"); static_assert(kQuantType == QuantType::BQuantGrouped,
             // "DoubleSmemBuffer Not implemented");
         }
     }
  
     CK_TILE_DEVICE void operator()(QuantGemmKernelArgs kargs) const
     {
         const auto blockId  = amd_wave_read_first_lane(blockIdx.x);
         const auto [iM, iN] = TilePartitioner{kargs.M, kargs.N}.GetOutputTileIndex(blockId);
         const index_t i_m   = amd_wave_read_first_lane(iM * TilePartitioner::MPerBlock);
         const index_t i_n   = amd_wave_read_first_lane(iN * TilePartitioner::NPerBlock);
  
         const SplitKBatchOffset splitk_batch_offset(kargs);
         // options
         const ADataType* a_ptr   = static_cast<const ADataType*>(kargs.a_ptr);
         const BDataType* b_ptr   = static_cast<const BDataType*>(kargs.b_ptr);
         const AQDataType* aq_ptr = static_cast<const AQDataType*>(kargs.aq_ptr);
         const BQDataType* bq_ptr = static_cast<const BQDataType*>(kargs.bq_ptr);
         CDataType* c_ptr         = static_cast<CDataType*>(kargs.c_ptr);
  
         // allocate LDS
         __shared__ char smem_ptr_0[GetSmemSize()];
  
         assert(kargs.k_batch == 1);
         if constexpr(GemmPipeline::DoubleSmemBuffer == true)
         {
             __shared__ char smem_ptr_1[GetSmemSize()];
  
             RunGemm2LDS(a_ptr,
                         b_ptr,
                         aq_ptr,
                         bq_ptr,
                         c_ptr,
                         smem_ptr_0,
                         smem_ptr_1,
                         kargs,
                         splitk_batch_offset,
                         i_m,
                         i_n);
         }
         else
         {
             RunGemm(a_ptr,
                     b_ptr,
                     aq_ptr,
                     bq_ptr,
                     c_ptr,
                     smem_ptr_0,
                     kargs,
                     splitk_batch_offset,
                     i_m,
                     i_n);
         }
     }
 };
  
 } // namespace ck_tile