//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCUDACXX___TYPE_TRAITS_MAKE_32_64_OR_128_BIT_H
#define _LIBCUDACXX___TYPE_TRAITS_MAKE_32_64_OR_128_BIT_H

#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#include "../__type_traits/conditional.h"
#include "../__type_traits/is_same.h"
#include "../__type_traits/is_signed.h"
#include "../__type_traits/is_unsigned.h"
#include "../__type_traits/make_unsigned.h"
#include "../cstdint"

_LIBCUDACXX_BEGIN_NAMESPACE_STD

/// Helper to promote an integral to smallest 32, 64, or 128 bit representation.
///
/// The restriction is the same as the integral version of to_char.
template <class _Tp>
#if _CCCL_STD_VER > 2017
  requires (is_signed_v<_Tp> || is_unsigned_v<_Tp> || is_same_v<_Tp, char>)
#endif
using __make_32_64_or_128_bit_t =
  __copy_unsigned_t<_Tp,
    __conditional_t<sizeof(_Tp) <= sizeof(int32_t),    int32_t,
    __conditional_t<sizeof(_Tp) <= sizeof(int64_t),    int64_t,
#ifndef _LIBCUDACXX_HAS_NO_INT128
    __conditional_t<sizeof(_Tp) <= sizeof(__int128_t), __int128_t,
    /* else */                                         void>
#else
    /* else */                                         void
#endif
    > >
  >;

_LIBCUDACXX_END_NAMESPACE_STD

#endif // _LIBCUDACXX___TYPE_TRAITS_MAKE_32_64_OR_128_BIT_H
