igemm_multiply_add.h

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#pragma once

#include <cutlass/fragment.h>

#include <cutlass/gemm/thread_multiply_add.h>

namespace cutlass {
namespace gemm {


template <typename AccumulatorsPerThread_, typename ThreadsPerWarp_>
struct ThreadMultiplyAdd<AccumulatorsPerThread_, ThreadsPerWarp_, int8_t, int8_t, int> {
  typedef Shape<4, 1, 1> InstructionShape;
  typedef AccumulatorsPerThread_ AccumulatorsPerThread;
  typedef ThreadsPerWarp_ ThreadsPerWarp;
  typedef typename ShapeMul<AccumulatorsPerThread, ThreadsPerWarp>::Shape AccumulatorsPerWarp;
  typedef int8_t ScalarA;
  typedef Fragment<ScalarA, AccumulatorsPerThread::kW * 4> FragmentA;
  typedef int8_t ScalarB;
  typedef Fragment<ScalarB, AccumulatorsPerThread::kH * 4> FragmentB;
  typedef int ScalarC;
  typedef Fragment<ScalarC, AccumulatorsPerThread::kH * AccumulatorsPerThread::kW> Accumulators;

  CUTLASS_DEVICE ThreadMultiplyAdd() {}

  CUTLASS_DEVICE void multiply_add(FragmentA const& a,
                                   FragmentB const& b,
                                   Accumulators const& c,
                                   Accumulators& d) {
    // The inputs.
    int const* a_int = reinterpret_cast<int const*>(&a[0]);
    int const* b_int = reinterpret_cast<int const*>(&b[0]);

    for (int j = 0; j < AccumulatorsPerThread::kH; ++j) {
      for (int i = 0; i < AccumulatorsPerThread::kW; ++i) {
        asm volatile("dp4a.s32.s32 %0, %1, %2, %3;"
                     : "=r"(d[j * AccumulatorsPerThread::kW + i])
                     : "r"(a_int[i]), "r"(b_int[j]), "r"(c[j * AccumulatorsPerThread::kW + i]));
      }
    }
  }
};


}  // namespace gemm
}  // namespace cutlass