flash-attention/csrc/cutlass/include/cute/arch/mma_sm61.hpp

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#pragma once

#include <cute/config.hpp>
#include <cute/arch/mma.hpp>

// Config
#if (defined(__CUDA_ARCH__) && (__CUDA_ARCH__ >= 610))
#  define CUTE_ARCH_MMA_SM61_ENABLED
#endif

namespace cute
{

struct SM61_DP4A
{
  using DRegisters = int32_t[1];
  using ARegisters = uint32_t[1];
  using BRegisters = uint32_t[1];
  using CRegisters = int32_t[1];

  // Register asm fma
  CUTE_HOST_DEVICE static void
  fma(int32_t& d, uint32_t const& a, uint32_t const& b, int32_t const& c)
  {
#if defined(CUTE_ARCH_MMA_SM61_ENABLED)
    asm volatile("dp4a.s32.s32 %0, %1, %2, %3;"
                 : "=r"(d)
                 : "r"(a), "r"(b), "r"(c));
#else
    CUTE_INVALID_CONTROL_PATH("Attempting to use SM61_DP4A without CUTE_ARCH_MMA_SM61_ENABLED");
#endif
  }
};

struct SM61_DP2A
{
  using DRegisters = int32_t[1];
  using ARegisters = uint32_t[1];
  using BRegisters = uint32_t[1];
  using CRegisters = int32_t[1];

  // Register asm fma
  CUTE_HOST_DEVICE static void
  fma(int32_t& d, uint32_t const& a, uint32_t const& b, int32_t const& c)
  {
#if defined(CUTE_ARCH_MMA_SM61_ENABLED)
    asm volatile("dp2a.s32.s32 %0, %1, %2, %3;"
                 : "=r"(d)
                 : "r"(a), "r"(b), "r"(c));
#else
    CUTE_INVALID_CONTROL_PATH("Attempting to use SM61_DP2A without CUTE_ARCH_MMA_SM61_ENABLED");
#endif
  }
};

} // namespace cute