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/*! \file
    \brief 
      Default kernel-level GEMM definitions combine threadblock-scoped matrix multiply-add with
      the appropriate threadblock-scoped epilogue.
  
      Note, CUTLASS epilogues universally target row-major outputs. Column-major outputs are
      accommodated by exchanging A and B operands and assuming transposed layouts. Partial
      specializations here choose 'device::GemmTransposed' to implement this functionality.

*/

#pragma once

#include "cutlass/cutlass.h"

#include "cutlass/complex.h"
#include "cutlass/layout/matrix.h"
#include "cutlass/numeric_types.h"

#include "cutlass/gemm/kernel/gemm_grouped.h"
#include "cutlass/gemm/kernel/gemm_transpose_operands.h"
#include "cutlass/gemm/kernel/default_gemm.h"
#include "cutlass/gemm/kernel/default_gemm_complex.h"
#include "cutlass/gemm/device/default_gemm_configuration.h"

#include "cutlass/layout/permute.h"

/////////////////////////////////////////////////////////////////////////////////////////////////

namespace cutlass {
namespace gemm {
namespace kernel {

/////////////////////////////////////////////////////////////////////////////////////////////////

template <
    /// Element type for A matrix operand
    typename ElementA_,
    /// Layout type for A matrix operand
    typename LayoutA_,
    /// Complex elementwise transformation on A operand
    ComplexTransform TransformA,
    /// Access granularity of A matrix in units of elements
    int kAlignmentA,
    /// Element type for B matrix operand
    typename ElementB_,
    /// Layout type for B matrix operand
    typename LayoutB_,
    /// Complex elementwise transformation on B operand
    ComplexTransform TransformB,
    /// Access granularity of B matrix in units of elements
    int kAlignmentB,
    /// Element type for C and D matrix operands
    typename ElementC_,
    /// Layout type for C and D matrix operands
    typename LayoutC_,
    /// Element type for internal accumulation
    typename ElementAccumulator,
    /// Operator class tag
    typename OperatorClass,
    /// Tag indicating architecture to tune for
    typename ArchTag,
    /// Threadblock-level tile size (concept: GemmShape)
    typename ThreadblockShape,
    /// Warp-level tile size (concept: GemmShape)
    typename WarpShape,
    /// Warp-level tile size (concept: GemmShape)
    typename InstructionShape,
    /// Epilogue output operator
    typename EpilogueOutputOp,
    /// Threadblock-level swizzling operator
    typename ThreadblockSwizzle,
    /// Number of stages used in the pipelined mainloop
    int Stages,
    /// Whether the schedule of problems to visit has been precomputed
    GroupScheduleMode GroupScheduleMode_ = GroupScheduleMode::kDeviceOnly,
    /// Operation performed by GEMM
    typename Operator = typename device::DefaultGemmConfiguration<
        OperatorClass, ArchTag, ElementA_, ElementB_, ElementC_,
        ElementAccumulator>::Operator,
    /// Use zfill or predicate for out-of-bound cp.async
    SharedMemoryClearOption SharedMemoryClear = SharedMemoryClearOption::kNone,
    /// Permute result D
    typename PermuteDLayout = layout::NoPermute,
    ///
    typename Enable = void
    >
struct DefaultGemmGrouped;

/////////////////////////////////////////////////////////////////////////////////////////////////
//
// Real-valued GEMM kernels
//

template <
    /// Element type for A matrix operand
    typename ElementA,
    /// Layout type for A matrix operand
    typename LayoutA,
    /// Access granularity of A matrix in units of elements
    int kAlignmentA,
    /// Element type for B matrix operand
    typename ElementB,
    /// Layout type for B matrix operand
    typename LayoutB,
    /// Access granularity of B matrix in units of elements
    int kAlignmentB,
    /// Element type for C and D matrix operands
    typename ElementC,
    /// Layout type for C and D matrix operands
    typename LayoutC,
    /// Element type for internal accumulation
    typename ElementAccumulator,
    /// Operator class tag
    typename OperatorClass,
    /// Tag indicating architecture to tune for
    typename ArchTag,
    /// Threadblock-level tile size (concept: GemmShape)
    typename ThreadblockShape,
    /// Warp-level tile size (concept: GemmShape)
    typename WarpShape,
    /// Warp-level tile size (concept: GemmShape)
    typename InstructionShape,
    /// Epilogue output operator
    typename EpilogueOutputOp,
    /// Threadblock-level swizzling operator
    typename ThreadblockSwizzle,
    /// Number of stages used in the pipelined mainloop
    int Stages,
    /// Whether the schedule of problems to visit has been precomputed
    GroupScheduleMode GroupScheduleMode_,
    /// Operation performed by GEMM
    typename Operator,
    /// Use zfill or predicate for out-of-bound cp.async
    SharedMemoryClearOption SharedMemoryClear,
    /// Permute result D
    typename PermuteDLayout
>
struct DefaultGemmGrouped<
  ElementA,
  LayoutA,
  ComplexTransform::kNone,   // transform A
  kAlignmentA,
  ElementB,
  LayoutB,
  ComplexTransform::kNone,   // transform B
  kAlignmentB,
  ElementC,
  LayoutC,
  ElementAccumulator,
  OperatorClass,
  ArchTag,
  ThreadblockShape,
  WarpShape,
  InstructionShape,
  EpilogueOutputOp,
  ThreadblockSwizzle,
  Stages,
  GroupScheduleMode_,
  Operator,
  SharedMemoryClear,
  PermuteDLayout,
  typename platform::enable_if< ! cutlass::is_complex<ElementAccumulator>::value>::type
> {

  // If true, we must construct a 'transposed-and-exchanged' Mma operator.
  static bool const kInternalTranspose = platform::is_same<LayoutC, layout::ColumnMajor>::value;

  using MapArguments = kernel::detail::MapArguments<
    ElementA,
    LayoutA,
    ComplexTransform::kNone,
    kAlignmentA,
    ElementB,
    LayoutB,
    ComplexTransform::kNone,
    kAlignmentB,
    LayoutC,
    kInternalTranspose
  >;

  // Define the default GEMM kernel
  using DefaultGemmKernel = typename kernel::DefaultGemm<
    typename MapArguments::ElementA,
    typename MapArguments::LayoutA,
    MapArguments::kAlignmentA,
    typename MapArguments::ElementB,
    typename MapArguments::LayoutB,
    MapArguments::kAlignmentB,
    ElementC,
    typename MapArguments::LayoutC,
    ElementAccumulator,
    OperatorClass,
    ArchTag,
    ThreadblockShape,
    WarpShape,
    InstructionShape,
    EpilogueOutputOp,
    ThreadblockSwizzle,
    Stages,
    true,
    Operator,
    SharedMemoryClear,
    false, /*GatherA*/
    false, /*GatherB*/
    false, /*ScatterD*/
    PermuteDLayout
  >::GemmKernel;

    /// Define the kernel in terms of the default kernel
  using GemmKernel = kernel::GemmGrouped<
    typename DefaultGemmKernel::Mma,
    typename DefaultGemmKernel::Epilogue,
    ThreadblockSwizzle,
    GroupScheduleMode_,
    kInternalTranspose
  >;
};

/////////////////////////////////////////////////////////////////////////////////////////////////

//
// Complex-valued GEMM kernels
//

template <
    /// Element type for A matrix operand
    typename ElementA,
    /// Layout type for A matrix operand
    typename LayoutA,
    /// Complex elementwise transformation on A operand
    ComplexTransform TransformA,
    /// Access granularity of A matrix in units of elements
    int kAlignmentA,
    /// Element type for B matrix operand
    typename ElementB,
    /// Layout type for B matrix operand
    typename LayoutB,
    /// Complex elementwise transformation on B operand
    ComplexTransform TransformB,
    /// Access granularity of B matrix in units of elements
    int kAlignmentB,
    /// Element type for C and D matrix operands
    typename ElementC,
    /// Layout type for C and D matrix operands
    typename LayoutC,
    /// Element type for internal accumulation
    typename ElementAccumulator,
    /// Operator class tag
    typename OperatorClass,
    /// Tag indicating architecture to tune for
    typename ArchTag,
    /// Threadblock-level tile size (concept: GemmShape)
    typename ThreadblockShape,
    /// Warp-level tile size (concept: GemmShape)
    typename WarpShape,
    /// Warp-level tile size (concept: GemmShape)
    typename InstructionShape,
    /// Epilogue output operator
    typename EpilogueOutputOp,
    /// Threadblock-level swizzling operator
    typename ThreadblockSwizzle,
    /// Number of stages used in the pipelined mainloop
    int Stages,
    /// Whether the schedule of problems to visit has been precomputed
    GroupScheduleMode GroupScheduleMode_,
    /// Operation performed by GEMM
    typename Operator,
    /// Use zfill or predicate for out-of-bound cp.async
    SharedMemoryClearOption SharedMemoryClear
  >
struct DefaultGemmGrouped<
  ElementA,
  LayoutA,
  TransformA,
  kAlignmentA,
  ElementB,
  LayoutB,
  TransformB,
  kAlignmentB,
  ElementC,
  LayoutC,
  ElementAccumulator,
  OperatorClass,
  ArchTag,
  ThreadblockShape,
  WarpShape,
  InstructionShape,
  EpilogueOutputOp,
  ThreadblockSwizzle,
  Stages,
  GroupScheduleMode_,
  Operator,
  SharedMemoryClear,
  layout::NoPermute, /*PermuteDLayout*/
  typename platform::enable_if<cutlass::is_complex<ElementAccumulator>::value>::type
> {

  // If true, we must construct a 'transposed-and-exchanged' Mma operator.
  static bool const kInternalTranspose = platform::is_same<LayoutC, layout::ColumnMajor>::value;

  using MapArguments = kernel::detail::MapArguments<
    ElementA,
    LayoutA,
    TransformA,
    kAlignmentA,
    ElementB,
    LayoutB,
    TransformB,
    kAlignmentB,
    LayoutC,
    kInternalTranspose
  >;

  using DefaultGemmKernel = typename kernel::DefaultGemmComplex<
    typename MapArguments::ElementA,
    typename MapArguments::LayoutA,
    typename MapArguments::ElementB,
    typename MapArguments::LayoutB,
    ElementC,
    typename MapArguments::LayoutC,
    ElementAccumulator,
    OperatorClass,
    ArchTag,
    ThreadblockShape,
    WarpShape,
    InstructionShape,
    EpilogueOutputOp,
    ThreadblockSwizzle,
    Stages,
    MapArguments::kTransformA,
    MapArguments::kTransformB,
    Operator,
    false
  >::GemmKernel;

  /// Define the kernel in terms of the default kernel
  using GemmKernel = kernel::GemmGrouped<
    typename DefaultGemmKernel::Mma,
    typename DefaultGemmKernel::Epilogue, 
    ThreadblockSwizzle,
    GroupScheduleMode_,
    kInternalTranspose
  >;
};

/////////////////////////////////////////////////////////////////////////////////////////////////

}  // namespace kernel
}  // namespace gemm
}  // namespace cutlass

/////////////////////////////////////////////////////////////////////////////////////////////////
