mirror of
https://github.com/matrix-construct/construct
synced 2024-12-11 08:02:59 +01:00
85 lines
1.9 KiB
C++
85 lines
1.9 KiB
C++
// The Construct
|
|
//
|
|
// Copyright (C) The Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2023 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_UTIL_POPCOUNT_H
|
|
|
|
namespace ircd {
|
|
inline namespace util
|
|
{
|
|
template<class T>
|
|
constexpr int popcount(const T) noexcept;
|
|
|
|
template<> constexpr int popcount(const unsigned long long) noexcept;
|
|
template<> constexpr int popcount(const unsigned long) noexcept;
|
|
template<> constexpr int popcount(const unsigned int) noexcept;
|
|
template<> constexpr int popcount(const unsigned short) noexcept;
|
|
template<> constexpr int popcount(const unsigned char) noexcept;
|
|
}}
|
|
|
|
template<>
|
|
constexpr int
|
|
ircd::util::popcount(const unsigned long long a)
|
|
noexcept
|
|
{
|
|
#if __has_feature(__cpp_lib_bitops)
|
|
return std::popcount(a);
|
|
#else
|
|
return __builtin_popcountll(a);
|
|
#endif
|
|
}
|
|
|
|
template<>
|
|
constexpr int
|
|
ircd::util::popcount(const unsigned long a)
|
|
noexcept
|
|
{
|
|
#if __has_feature(__cpp_lib_bitops)
|
|
return std::popcount(a);
|
|
#else
|
|
return __builtin_popcountl(a);
|
|
#endif
|
|
}
|
|
|
|
template<>
|
|
constexpr int
|
|
ircd::util::popcount(const unsigned int a)
|
|
noexcept
|
|
{
|
|
#if __has_feature(__cpp_lib_bitops)
|
|
return std::popcount(a);
|
|
#else
|
|
return __builtin_popcount(a);
|
|
#endif
|
|
}
|
|
|
|
template<>
|
|
constexpr int
|
|
ircd::util::popcount(const unsigned short a)
|
|
noexcept
|
|
{
|
|
#if __has_feature(__cpp_lib_bitops)
|
|
return std::popcount(a);
|
|
#else
|
|
return __builtin_popcount(a);
|
|
#endif
|
|
}
|
|
|
|
template<>
|
|
constexpr int
|
|
ircd::util::popcount(const unsigned char a)
|
|
noexcept
|
|
{
|
|
#if __has_feature(__cpp_lib_bitops)
|
|
return std::popcount(a);
|
|
#else
|
|
return __builtin_popcount(a);
|
|
#endif
|
|
}
|