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 // SPDX-License-Identifier: MIT
 // Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
  
 #pragma once
  
 namespace ck {
 namespace tensor_operation {
 namespace device {
  
 enum struct MaskingSpecialization
 {
     MaskDisabled,
     MaskOutUpperTriangle
 };
  
 inline std::string getMaskingSpecializationString(const MaskingSpecialization& s)
 {
     switch(s)
     {
     case MaskingSpecialization::MaskDisabled: return "MaskDisabled";
     case MaskingSpecialization::MaskOutUpperTriangle: return "MaskOutUpperTriangle";
     default: return "Unrecognized specialization!";
     }
 }
  
 struct MaskDisabledPredicate
 {
     __host__ __device__ constexpr bool operator()(index_t /*m*/, index_t /*n*/) const
     {
         return false;
     };
  
     __host__ __device__ constexpr bool
         IsTileSkippable(index_t /*m*/, index_t /*n*/, index_t /*m_tile*/, index_t /*n_tile*/) const
     {
         return false;
     }
 };
  
 struct MaskOutUpperTrianglePredicate
 {
     __host__ __device__ constexpr bool operator()(index_t m, index_t n) const { return n > m; }
  
     __host__ __device__ constexpr bool
     IsTileSkippable(index_t m, index_t n, index_t m_tile, index_t /*n_tile*/) const
     {
         return operator()(m + m_tile - 1, n);
     }
 };
  
 // to track the points which need to be set to -inf on C0
 // Note: no need to reset M padding value, because they will not be stored out.
 template <typename MaskOutPredicate>
 struct C0MatrixMask_impl
 {
     __host__ __device__ C0MatrixMask_impl(index_t NRaw)
         : NRaw_(NRaw), predicate_(MaskOutPredicate{})
     {
     }
  
     __host__ __device__ constexpr bool IsNOutOfBound(/*index_t m, */ index_t n) const
     {
         return n >= NRaw_;
     }
  
     __host__ __device__ constexpr bool IsMaskedElement(index_t m, index_t n) const
     {
         return predicate_(m, n) || IsNOutOfBound(n);
     }
  
     __host__ __device__ constexpr bool
     IsTileSkippable(index_t m, index_t n, index_t m_tile, index_t n_tile) const
     {
         return predicate_.IsTileSkippable(m, n, m_tile, n_tile);
     }
  
     private:
     // index_t MRaw_;
     index_t NRaw_;
     MaskOutPredicate predicate_;
 };
  
 } // namespace device
 } // namespace tensor_operation
 } // namespace ck