FastDeploy/custom_ops/gpu_ops/cutlass_extensions/arch/mma.h

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/*! \file
    \brief Templates exposing architecture support for multiply-add operations
*/

#pragma once
#include "cutlass_extensions/weight_only_quant_op.h"

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

namespace cutlass {
namespace arch {

// Tag which triggers MMA which will trigger
struct OpMultiplyAddDequantizeInterleavedBToA;

/*
  Below we have extra tags to signal what kind of dequantization we want to do
  (per col, scale only fine grained, finegrained with zero). This still lets us
  the existing template infrastructure (incl. that in CUTLASS). However, we
  split out the template below into OpMultiplyAddDequantizeInterleavedBToA along
  with the quantization op before instantiating the GEMM pieces.

  Note that this is somewhat of a hack, but it SIGNIFICANTLY reduces the amount
  of code we need to duplicate.
 */
struct OpMultiplyAddDequantizeInterleavedBToA_percol_scale;
struct OpMultiplyAddDequantizeInterleavedBToA_fine_scale;
struct OpMultiplyAddDequantizeInterleavedBToA_fine_scalebias;

// The default just forwards the original operator
template <typename MmaOp, WeightOnlyQuantOp QuantOp_>
struct TagOperator {
  using TaggedOperator = MmaOp;
};

// Specializations below attach more information to the operator
template <>
struct TagOperator<OpMultiplyAddDequantizeInterleavedBToA,
                   WeightOnlyQuantOp::PER_COLUMN_SCALE_ONLY> {
  using TaggedOperator = OpMultiplyAddDequantizeInterleavedBToA_percol_scale;
};

template <>
struct TagOperator<OpMultiplyAddDequantizeInterleavedBToA,
                   WeightOnlyQuantOp::FINEGRAINED_SCALE_ONLY> {
  using TaggedOperator = OpMultiplyAddDequantizeInterleavedBToA_fine_scale;
};

template <>
struct TagOperator<OpMultiplyAddDequantizeInterleavedBToA,
                   WeightOnlyQuantOp::FINEGRAINED_SCALE_AND_ZEROS> {
  using TaggedOperator = OpMultiplyAddDequantizeInterleavedBToA_fine_scalebias;
};

// Here we instantiate some structs to "detag" the tagged operator. It splits it
// back to the original operator + the extra information. If no extra info was
// tagged, the dequant op per column scaling as a default.
template <typename TaggedMmaOp>
struct DetagOperator {
  using Operator = TaggedMmaOp;
  static constexpr WeightOnlyQuantOp QuantOp =
      WeightOnlyQuantOp::PER_COLUMN_SCALE_ONLY;
};

template <>
struct DetagOperator<OpMultiplyAddDequantizeInterleavedBToA_percol_scale> {
  using Operator = OpMultiplyAddDequantizeInterleavedBToA;
  static constexpr WeightOnlyQuantOp QuantOp =
      WeightOnlyQuantOp::PER_COLUMN_SCALE_ONLY;
};

template <>
struct DetagOperator<OpMultiplyAddDequantizeInterleavedBToA_fine_scale> {
  using Operator = OpMultiplyAddDequantizeInterleavedBToA;
  static constexpr WeightOnlyQuantOp QuantOp =
      WeightOnlyQuantOp::FINEGRAINED_SCALE_ONLY;
};

template <>
struct DetagOperator<OpMultiplyAddDequantizeInterleavedBToA_fine_scalebias> {
  using Operator = OpMultiplyAddDequantizeInterleavedBToA;
  static constexpr WeightOnlyQuantOp QuantOp =
      WeightOnlyQuantOp::FINEGRAINED_SCALE_AND_ZEROS;
};

}  // namespace arch
}  // namespace cutlass