flash-attention/csrc/cutlass/include/cute/numeric/int.hpp

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#pragma once

#if defined(__CUDACC_RTC__)
#include <cuda/std/cstdint>
#else
#include <cstdint>
#endif

#include <cutlass/numeric_types.h>

namespace cute
{

//
// Signed integers
//

using int2_t  = cutlass::int2b_t;
using int4_t  = cutlass::int4b_t;
using CUTE_STL_NAMESPACE::int8_t;
using CUTE_STL_NAMESPACE::int16_t;
using CUTE_STL_NAMESPACE::int32_t;
using CUTE_STL_NAMESPACE::int64_t;

template <int N> struct int_bit;
template <> struct int_bit<  2>  { using type = cutlass::int2b_t; };
template <> struct int_bit<  4>  { using type = cutlass::int4b_t; };
template <> struct int_bit<  8>  { using type = int8_t;  };
template <> struct int_bit< 16>  { using type = int16_t; };
template <> struct int_bit< 32>  { using type = int32_t; };
template <> struct int_bit< 64>  { using type = int64_t; };

template <int N>
using int_bit_t = typename int_bit<N>::type;

template <int N>
using int_byte = int_bit<8*N>;

template <int N>
using int_byte_t = typename int_byte<N>::type;

//
// Unsigned integers
//

using uint1_t   = cutlass::uint1b_t;
using uint2_t   = cutlass::uint2b_t;
using uint4_t   = cutlass::uint4b_t;
using CUTE_STL_NAMESPACE::uint8_t;
using CUTE_STL_NAMESPACE::uint16_t;
using CUTE_STL_NAMESPACE::uint32_t;
using CUTE_STL_NAMESPACE::uint64_t;
using cutlass::uint128_t;

template <int N> struct uint_bit;
template <> struct uint_bit<  1> { using type = cutlass::uint1b_t; };
template <> struct uint_bit<  2> { using type = cutlass::uint2b_t; };
template <> struct uint_bit<  4> { using type = cutlass::uint4b_t; };
template <> struct uint_bit<  8> { using type = uint8_t;  };
template <> struct uint_bit< 16> { using type = uint16_t; };
template <> struct uint_bit< 32> { using type = uint32_t; };
template <> struct uint_bit< 64> { using type = uint64_t; };
template <> struct uint_bit<128> { using type = cutlass::uint128_t; };

template <int N>
using uint_bit_t = typename uint_bit<N>::type;

template <int N>
using uint_byte = uint_bit<8*N>;

template <int N>
using uint_byte_t = typename uint_byte<N>::type;

} // namespace cute