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 // SPDX-License-Identifier: MIT
 // Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
  
 #pragma once
  
 #include "ck/ck.hpp"
 #include "ck/utility/data_type.hpp"
 #include "enable_if.hpp"
 #include "c_style_pointer_cast.hpp"
 #include "amd_buffer_addressing.hpp"
 #include "generic_memory_space_atomic.hpp"
  
 namespace ck {
  
 // T may be scalar or vector
 // X may be scalar or vector
 // T and X have same scalar type
 // X contains multiple T
 template <AddressSpaceEnum BufferAddressSpace,
           typename T,
           typename ElementSpaceSize,
           bool InvalidElementUseNumericalZeroValue,
           AmdBufferCoherenceEnum coherence = AmdBufferCoherenceEnum::DefaultCoherence>
 struct DynamicBuffer
 {
     using type = T;
  
     T* p_data_;
     ElementSpaceSize element_space_size_;
     T invalid_element_value_ = T{0};
  
     static constexpr index_t PackedSize = []() {
         if constexpr(is_same_v<remove_cvref_t<T>, pk_i4_t>)
             return 2;
         else
             return 1;
     }();
  
     __host__ __device__ constexpr DynamicBuffer(T* p_data, ElementSpaceSize element_space_size)
         : p_data_{p_data}, element_space_size_{element_space_size}
     {
     }
  
     __host__ __device__ constexpr DynamicBuffer(T* p_data,
                                                 ElementSpaceSize element_space_size,
                                                 T invalid_element_value)
         : p_data_{p_data},
           element_space_size_{element_space_size},
           invalid_element_value_{invalid_element_value}
     {
     }
  
     __host__ __device__ static constexpr AddressSpaceEnum GetAddressSpace()
     {
         return BufferAddressSpace;
     }
  
     __host__ __device__ constexpr const T& operator[](index_t i) const { return p_data_[i]; }
  
     __host__ __device__ constexpr T& operator()(index_t i) { return p_data_[i]; }
  
     template <typename X,
               typename enable_if<is_same<typename scalar_type<remove_cvref_t<X>>::type,
                                          typename scalar_type<remove_cvref_t<T>>::type>::value ||
                                      !is_native_type<X>(),
                                  bool>::type = false>
     __host__ __device__ constexpr auto Get(index_t i, bool is_valid_element) const
     {
         // X contains multiple T
         constexpr index_t scalar_per_t_vector = scalar_type<remove_cvref_t<T>>::vector_size;
  
         constexpr index_t scalar_per_x_vector = scalar_type<remove_cvref_t<X>>::vector_size;
  
         static_assert(scalar_per_x_vector % scalar_per_t_vector == 0,
                       "wrong! X should contain multiple T");
  
 #if CK_USE_AMD_BUFFER_LOAD
         bool constexpr use_amd_buffer_addressing = true;
 #else
         bool constexpr use_amd_buffer_addressing = false;
 #endif
  
         if constexpr(GetAddressSpace() == AddressSpaceEnum::Global && use_amd_buffer_addressing)
         {
             constexpr index_t t_per_x = scalar_per_x_vector / scalar_per_t_vector;
  
             if constexpr(InvalidElementUseNumericalZeroValue)
             {
                 return amd_buffer_load_invalid_element_return_zero<remove_cvref_t<T>,
                                                                    t_per_x,
                                                                    coherence>(
                     p_data_, i, is_valid_element, element_space_size_ / PackedSize);
             }
             else
             {
                 return amd_buffer_load_invalid_element_return_customized_value<remove_cvref_t<T>,
                                                                                t_per_x,
                                                                                coherence>(
                     p_data_,
                     i,
                     is_valid_element,
                     element_space_size_ / PackedSize,
                     invalid_element_value_);
             }
         }
         else
         {
             if(is_valid_element)
             {
 #if CK_EXPERIMENTAL_USE_MEMCPY_FOR_VECTOR_ACCESS
                 X tmp;
  
                 __builtin_memcpy(&tmp, &(p_data_[i]), sizeof(X));
  
                 return tmp;
 #else
                 return *c_style_pointer_cast<const X*>(&p_data_[i]);
 #endif
             }
             else
             {
                 if constexpr(InvalidElementUseNumericalZeroValue)
                 {
                     return X{0};
                 }
                 else
                 {
                     return X{invalid_element_value_};
                 }
             }
         }
     }
  
     template <InMemoryDataOperationEnum Op,
               typename X,
               typename enable_if<is_same<typename scalar_type<remove_cvref_t<X>>::type,
                                          typename scalar_type<remove_cvref_t<T>>::type>::value,
                                  bool>::type = false>
     __host__ __device__ void Update(index_t i, bool is_valid_element, const X& x)
     {
         if constexpr(Op == InMemoryDataOperationEnum::Set)
         {
             this->template Set<X>(i, is_valid_element, x);
         }
         else if constexpr(Op == InMemoryDataOperationEnum::AtomicAdd)
         {
             this->template AtomicAdd<X>(i, is_valid_element, x);
         }
         else if constexpr(Op == InMemoryDataOperationEnum::AtomicMax)
         {
             this->template AtomicMax<X>(i, is_valid_element, x);
         }
         else if constexpr(Op == InMemoryDataOperationEnum::Add)
         {
             auto tmp       = this->template Get<X>(i, is_valid_element);
             using scalar_t = typename scalar_type<remove_cvref_t<T>>::type;
             // handle bfloat addition
             if constexpr(is_same_v<scalar_t, bhalf_t>)
             {
                 if constexpr(is_scalar_type<X>::value)
                 {
                     // Scalar type
                     auto result =
                         type_convert<X>(type_convert<float>(x) + type_convert<float>(tmp));
                     this->template Set<X>(i, is_valid_element, result);
                 }
                 else
                 {
                     // Vector type
                     constexpr auto vector_size = scalar_type<remove_cvref_t<X>>::vector_size;
                     const vector_type<scalar_t, vector_size> a_vector{tmp};
                     const vector_type<scalar_t, vector_size> b_vector{x};
                     static_for<0, vector_size, 1>{}([&](auto idx) {
                         auto result = type_convert<scalar_t>(
                             type_convert<float>(a_vector.template AsType<scalar_t>()[idx]) +
                             type_convert<float>(b_vector.template AsType<scalar_t>()[idx]));
                         this->template Set<scalar_t>(i + idx, is_valid_element, result);
                     });
                 }
             }
             else
             {
                 this->template Set<X>(i, is_valid_element, x + tmp);
             }
         }
     }
  
     template <typename DstBuffer, index_t NumElemsPerThread>
     __host__ __device__ void DirectCopyToLds(DstBuffer& dst_buf,
                                              index_t src_offset,
                                              index_t dst_offset,
                                              bool is_valid_element) const
     {
         // Copy data from global to LDS memory using direct loads.
         static_assert(GetAddressSpace() == AddressSpaceEnum::Global,
                       "Source data must come from a global memory buffer.");
         static_assert(DstBuffer::GetAddressSpace() == AddressSpaceEnum::Lds,
                       "Destination data must be stored in an LDS memory buffer.");
  
         amd_direct_load_global_to_lds<T, NumElemsPerThread>(p_data_,
                                                             src_offset,
                                                             dst_buf.p_data_,
                                                             dst_offset,
                                                             is_valid_element,
                                                             element_space_size_ / PackedSize);
     }
  
     template <typename X,
               typename enable_if<is_same<typename scalar_type<remove_cvref_t<X>>::type,
                                          typename scalar_type<remove_cvref_t<T>>::type>::value ||
                                      !is_native_type<X>(),
                                  bool>::type = false>
     __host__ __device__ void Set(index_t i, bool is_valid_element, const X& x)
     {
         // X contains multiple T
         constexpr index_t scalar_per_t_vector = scalar_type<remove_cvref_t<T>>::vector_size;
  
         constexpr index_t scalar_per_x_vector = scalar_type<remove_cvref_t<X>>::vector_size;
  
         static_assert(scalar_per_x_vector % scalar_per_t_vector == 0,
                       "wrong! X should contain multiple T");
  
 #if CK_USE_AMD_BUFFER_STORE
         bool constexpr use_amd_buffer_addressing = true;
 #else
         bool constexpr use_amd_buffer_addressing      = false;
 #endif
  
 #if CK_WORKAROUND_SWDEV_XXXXXX_INT8_DS_WRITE_ISSUE
         bool constexpr workaround_int8_ds_write_issue = true;
 #else
         bool constexpr workaround_int8_ds_write_issue = false;
 #endif
  
         if constexpr(GetAddressSpace() == AddressSpaceEnum::Global && use_amd_buffer_addressing)
         {
             constexpr index_t t_per_x = scalar_per_x_vector / scalar_per_t_vector;
  
             amd_buffer_store<remove_cvref_t<T>, t_per_x, coherence>(
                 x, p_data_, i, is_valid_element, element_space_size_ / PackedSize);
         }
         else if constexpr(GetAddressSpace() == AddressSpaceEnum::Lds &&
                           is_same<typename scalar_type<remove_cvref_t<T>>::type, int8_t>::value &&
                           workaround_int8_ds_write_issue)
         {
             if(is_valid_element)
             {
                 // HACK: compiler would lower IR "store<i8, 16> address_space(3)" into inefficient
                 // ISA, so I try to let compiler emit IR "store<i32, 4>" which would be lower to
                 // ds_write_b128
                 // TODO: remove this after compiler fix
                 static_assert((is_same<remove_cvref_t<T>, int8_t>::value &&
                                is_same<remove_cvref_t<X>, int8_t>::value) ||
                                   (is_same<remove_cvref_t<T>, int8_t>::value &&
                                    is_same<remove_cvref_t<X>, int8x2_t>::value) ||
                                   (is_same<remove_cvref_t<T>, int8_t>::value &&
                                    is_same<remove_cvref_t<X>, int8x4_t>::value) ||
                                   (is_same<remove_cvref_t<T>, int8_t>::value &&
                                    is_same<remove_cvref_t<X>, int8x8_t>::value) ||
                                   (is_same<remove_cvref_t<T>, int8_t>::value &&
                                    is_same<remove_cvref_t<X>, int8x16_t>::value) ||
                                   (is_same<remove_cvref_t<T>, int8x4_t>::value &&
                                    is_same<remove_cvref_t<X>, int8x4_t>::value) ||
                                   (is_same<remove_cvref_t<T>, int8x8_t>::value &&
                                    is_same<remove_cvref_t<X>, int8x8_t>::value) ||
                                   (is_same<remove_cvref_t<T>, int8x16_t>::value &&
                                    is_same<remove_cvref_t<X>, int8x16_t>::value),
                               "wrong! not implemented for this combination, please add "
                               "implementation");
  
                 if constexpr(is_same<remove_cvref_t<T>, int8_t>::value &&
                              is_same<remove_cvref_t<X>, int8_t>::value)
                 {
                     // HACK: cast pointer of x is bad
                     // TODO: remove this after compiler fix
                     *c_style_pointer_cast<int8_t*>(&p_data_[i]) =
                         *c_style_pointer_cast<const int8_t*>(&x);
                 }
                 else if constexpr(is_same<remove_cvref_t<T>, int8_t>::value &&
                                   is_same<remove_cvref_t<X>, int8x2_t>::value)
                 {
                     // HACK: cast pointer of x is bad
                     // TODO: remove this after compiler fix
                     *c_style_pointer_cast<int16_t*>(&p_data_[i]) =
                         *c_style_pointer_cast<const int16_t*>(&x);
                 }
                 else if constexpr(is_same<remove_cvref_t<T>, int8_t>::value &&
                                   is_same<remove_cvref_t<X>, int8x4_t>::value)
                 {
                     // HACK: cast pointer of x is bad
                     // TODO: remove this after compiler fix
                     *c_style_pointer_cast<int32_t*>(&p_data_[i]) =
                         *c_style_pointer_cast<const int32_t*>(&x);
                 }
                 else if constexpr(is_same<remove_cvref_t<T>, int8_t>::value &&
                                   is_same<remove_cvref_t<X>, int8x8_t>::value)
                 {
                     // HACK: cast pointer of x is bad
                     // TODO: remove this after compiler fix
                     *c_style_pointer_cast<int32x2_t*>(&p_data_[i]) =
                         *c_style_pointer_cast<const int32x2_t*>(&x);
                 }
                 else if constexpr(is_same<remove_cvref_t<T>, int8_t>::value &&
                                   is_same<remove_cvref_t<X>, int8x16_t>::value)
                 {
                     // HACK: cast pointer of x is bad
                     // TODO: remove this after compiler fix
                     *c_style_pointer_cast<int32x4_t*>(&p_data_[i]) =
                         *c_style_pointer_cast<const int32x4_t*>(&x);
                 }
                 else if constexpr(is_same<remove_cvref_t<T>, int8x4_t>::value &&
                                   is_same<remove_cvref_t<X>, int8x4_t>::value)
                 {
                     // HACK: cast pointer of x is bad
                     // TODO: remove this after compiler fix
                     *c_style_pointer_cast<int32_t*>(&p_data_[i]) =
                         *c_style_pointer_cast<const int32_t*>(&x);
                 }
                 else if constexpr(is_same<remove_cvref_t<T>, int8x8_t>::value &&
                                   is_same<remove_cvref_t<X>, int8x8_t>::value)
                 {
                     // HACK: cast pointer of x is bad
                     // TODO: remove this after compiler fix
                     *c_style_pointer_cast<int32x2_t*>(&p_data_[i]) =
                         *c_style_pointer_cast<const int32x2_t*>(&x);
                 }
                 else if constexpr(is_same<remove_cvref_t<T>, int8x16_t>::value &&
                                   is_same<remove_cvref_t<X>, int8x16_t>::value)
                 {
                     // HACK: cast pointer of x is bad
                     // TODO: remove this after compiler fix
                     *c_style_pointer_cast<int32x4_t*>(&p_data_[i]) =
                         *c_style_pointer_cast<const int32x4_t*>(&x);
                 }
             }
         }
         else
         {
             if(is_valid_element)
             {
 #if CK_EXPERIMENTAL_USE_MEMCPY_FOR_VECTOR_ACCESS
                 X tmp = x;
  
                 __builtin_memcpy(&(p_data_[i]), &tmp, sizeof(X));
 #else
                 *c_style_pointer_cast<X*>(&p_data_[i]) = x;
 #endif
             }
         }
     }
  
     template <typename X,
               typename enable_if<is_same<typename scalar_type<remove_cvref_t<X>>::type,
                                          typename scalar_type<remove_cvref_t<T>>::type>::value,
                                  bool>::type = false>
     __host__ __device__ void AtomicAdd(index_t i, bool is_valid_element, const X& x)
     {
         using scalar_t = typename scalar_type<remove_cvref_t<T>>::type;
  
         // X contains multiple T
         constexpr index_t scalar_per_t_vector = scalar_type<remove_cvref_t<T>>::vector_size;
  
         constexpr index_t scalar_per_x_vector = scalar_type<remove_cvref_t<X>>::vector_size;
  
         static_assert(scalar_per_x_vector % scalar_per_t_vector == 0,
                       "wrong! X should contain multiple T");
  
         static_assert(GetAddressSpace() == AddressSpaceEnum::Global, "only support global mem");
  
 #if CK_USE_AMD_BUFFER_ATOMIC_ADD_INTEGER && CK_USE_AMD_BUFFER_ATOMIC_ADD_FLOAT
         bool constexpr use_amd_buffer_addressing =
             is_same_v<remove_cvref_t<scalar_t>, int32_t> ||
             is_same_v<remove_cvref_t<scalar_t>, float> ||
             (is_same_v<remove_cvref_t<scalar_t>, half_t> && scalar_per_x_vector % 2 == 0) ||
             (is_same_v<remove_cvref_t<scalar_t>, bhalf_t> && scalar_per_x_vector % 2 == 0);
 #elif CK_USE_AMD_BUFFER_ATOMIC_ADD_INTEGER && (!CK_USE_AMD_BUFFER_ATOMIC_ADD_FLOAT)
         bool constexpr use_amd_buffer_addressing = is_same_v<remove_cvref_t<scalar_t>, int32_t>;
 #elif(!CK_USE_AMD_BUFFER_ATOMIC_ADD_INTEGER) && CK_USE_AMD_BUFFER_ATOMIC_ADD_FLOAT
         bool constexpr use_amd_buffer_addressing =
             is_same_v<remove_cvref_t<scalar_t>, float> ||
             (is_same_v<remove_cvref_t<scalar_t>, half_t> && scalar_per_x_vector % 2 == 0) ||
             (is_same_v<remove_cvref_t<scalar_t>, bhalf_t> && scalar_per_x_vector % 2 == 0);
 #else
         bool constexpr use_amd_buffer_addressing = false;
 #endif
  
         if constexpr(use_amd_buffer_addressing)
         {
             constexpr index_t t_per_x = scalar_per_x_vector / scalar_per_t_vector;
  
             amd_buffer_atomic_add<remove_cvref_t<T>, t_per_x>(
                 x, p_data_, i, is_valid_element, element_space_size_ / PackedSize);
         }
         else
         {
             if(is_valid_element)
             {
                 atomic_add<X>(c_style_pointer_cast<X*>(&p_data_[i]), x);
             }
         }
     }
  
     template <typename X,
               typename enable_if<is_same<typename scalar_type<remove_cvref_t<X>>::type,
                                          typename scalar_type<remove_cvref_t<T>>::type>::value,
                                  bool>::type = false>
     __host__ __device__ void AtomicMax(index_t i, bool is_valid_element, const X& x)
     {
         // X contains multiple T
         constexpr index_t scalar_per_t_vector = scalar_type<remove_cvref_t<T>>::vector_size;
  
         constexpr index_t scalar_per_x_vector = scalar_type<remove_cvref_t<X>>::vector_size;
  
         static_assert(scalar_per_x_vector % scalar_per_t_vector == 0,
                       "wrong! X should contain multiple T");
  
         static_assert(GetAddressSpace() == AddressSpaceEnum::Global, "only support global mem");
  
 #if CK_USE_AMD_BUFFER_ATOMIC_MAX_FLOAT64
         using scalar_t                           = typename scalar_type<remove_cvref_t<T>>::type;
         bool constexpr use_amd_buffer_addressing = is_same_v<remove_cvref_t<scalar_t>, double>;
 #else
         bool constexpr use_amd_buffer_addressing = false;
 #endif
  
         if constexpr(use_amd_buffer_addressing)
         {
             constexpr index_t t_per_x = scalar_per_x_vector / scalar_per_t_vector;
  
             amd_buffer_atomic_max<remove_cvref_t<T>, t_per_x>(
                 x, p_data_, i, is_valid_element, element_space_size_ / PackedSize);
         }
         else if(is_valid_element)
         {
             atomic_max<X>(c_style_pointer_cast<X*>(&p_data_[i]), x);
         }
     }
  
     __host__ __device__ static constexpr bool IsStaticBuffer() { return false; }
  
     __host__ __device__ static constexpr bool IsDynamicBuffer() { return true; }
 };
  
 template <AddressSpaceEnum BufferAddressSpace,
           AmdBufferCoherenceEnum coherence = AmdBufferCoherenceEnum::DefaultCoherence,
           typename T,
           typename ElementSpaceSize>
 __host__ __device__ constexpr auto make_dynamic_buffer(T* p, ElementSpaceSize element_space_size)
 {
     return DynamicBuffer<BufferAddressSpace, T, ElementSpaceSize, true, coherence>{
         p, element_space_size};
 }
  
 template <
     AddressSpaceEnum BufferAddressSpace,
     AmdBufferCoherenceEnum coherence = AmdBufferCoherenceEnum::DefaultCoherence,
     typename T,
     typename ElementSpaceSize,
     typename X,
     typename enable_if<is_same<remove_cvref_t<T>, remove_cvref_t<X>>::value, bool>::type = false>
 __host__ __device__ constexpr auto
 make_dynamic_buffer(T* p, ElementSpaceSize element_space_size, X invalid_element_value)
 {
     return DynamicBuffer<BufferAddressSpace, T, ElementSpaceSize, false, coherence>{
         p, element_space_size, invalid_element_value};
 }
  
 } // namespace ck