flash-attention/csrc/cutlass/include/cute/arch/mma_sm75.hpp

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#pragma once

#include <cute/config.hpp>

#include <cute/arch/mma.hpp>

// Config
#if ((__CUDACC_VER_MAJOR__ > 10) || (__CUDACC_VER_MAJOR__ == 10 && __CUDACC_VER_MINOR__ >= 2))
#  define CUTE_ARCH_MMA_SM75_SUPPORTED
#  if (defined(__CUDA_ARCH__) && (__CUDA_ARCH__ >= 750))
#    define CUTE_ARCH_MMA_SM75_ENABLED
#  endif
#endif

namespace cute
{

//
// SM75 MMA 1688 F16F16F32
//

struct SM75_16x8x8_F32F16F16F32_TN
{
  using DRegisters = float[4];
  using ARegisters = uint32_t[2];
  using BRegisters = uint32_t[1];
  using CRegisters = float[4];

  // Register asm fma
  CUTE_HOST_DEVICE static void
  fma(float         & d0, float         & d1, float      & d2, float      & d3,
      uint32_t const& a0, uint32_t const& a1,
      uint32_t const& b0,
      float    const& c0, float    const& c1, float const& c2, float const& c3)
  {
#if defined(CUTE_ARCH_MMA_SM75_ENABLED)
    asm volatile("mma.sync.aligned.m16n8k8.row.col.f32.f16.f16.f32"
                 "{%0, %1, %2, %3},"
                 "{%4, %5},"
                 "{%6},"
                 "{%7, %8, %9, %10};\n"
        : "=f"(d0), "=f"(d1), "=f"(d2), "=f"(d3)
        :  "r"(a0),  "r"(a1),
           "r"(b0),
           "f"(c0),  "f"(c1),  "f"(c2),  "f"(c3));
#else
    CUTE_INVALID_CONTROL_PATH("Attempting to use SM75_16x8x8_F32F16F16F32_TN without CUTE_ARCH_MMA_SM75_ENABLED");
#endif
  }
};

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

//
// SM75 MMA 8816 S8S8S32
//

struct SM75_8x8x16_S32S8S8S32_TN
{
  using DRegisters = uint32_t[2];
  using ARegisters = uint32_t[1];
  using BRegisters = uint32_t[1];
  using CRegisters = uint32_t[2];

  // Register asm fma
  CUTE_HOST_DEVICE static void
  fma(uint32_t      & d0, uint32_t      & d1,
      uint32_t const& a0,
      uint32_t const& b0,
      uint32_t const& c0, uint32_t const& c1)
  {
#if defined(CUTE_ARCH_MMA_SM75_ENABLED)
    asm volatile("mma.sync.aligned.m8n8k16.row.col.s32.s8.s8.s32"
                 "{%0, %1},"
                 "{%2},"
                 "{%3},"
                 "{%4, %5};\n"
        : "=r"(d0), "=r"(d1)
        :  "r"(a0),
           "r"(b0),
           "r"(c0),  "r"(c1));
#else
    CUTE_INVALID_CONTROL_PATH("Attempting to use SM75_8x8x16_S32S8S8S32_TN without CUTE_ARCH_MMA_SM75_ENABLED");
#endif
  }
};

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

} // end namespace cute