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Use __builtin_bswap under GCC and Clang

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This commit is contained in:
Peter Dimov 2023-05-30 19:22:00 +03:00
parent b591214103
commit f41b8f38c4
1 changed files with 16 additions and 0 deletions
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16
include/boost/core/bit.hpp
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@ -807,6 +807,20 @@ BOOST_CONSTEXPR inline boost::uint16_t byteswap_impl( boost::uint16_t x ) BOOST_
return (x << 8) | (x >> 8); return (x << 8) | (x >> 8);
} }
#if defined(__GNUC__) || defined(__clang__)
BOOST_CXX14_CONSTEXPR inline boost::uint32_t byteswap_impl( boost::uint32_t x ) BOOST_NOEXCEPT
{
return __builtin_bswap32( x );
}
BOOST_CXX14_CONSTEXPR inline boost::uint64_t byteswap_impl( boost::uint64_t x ) BOOST_NOEXCEPT
{
return __builtin_bswap64( x );
}
#else
BOOST_CXX14_CONSTEXPR inline boost::uint32_t byteswap_impl( boost::uint32_t x ) BOOST_NOEXCEPT BOOST_CXX14_CONSTEXPR inline boost::uint32_t byteswap_impl( boost::uint32_t x ) BOOST_NOEXCEPT
{ {
boost::uint32_t step16 = x << 16 | x >> 16; boost::uint32_t step16 = x << 16 | x >> 16;
@ -820,6 +834,8 @@ BOOST_CXX14_CONSTEXPR inline boost::uint64_t byteswap_impl( boost::uint64_t x )
return (step16 & 0x00FF00FF00FF00FFULL) << 8 | (step16 & 0xFF00FF00FF00FF00ULL) >> 8; return (step16 & 0x00FF00FF00FF00FFULL) << 8 | (step16 & 0xFF00FF00FF00FF00ULL) >> 8;
} }
#endif
} // namespace detail } // namespace detail
template<class T> BOOST_CXX14_CONSTEXPR T byteswap( T x ) BOOST_NOEXCEPT template<class T> BOOST_CXX14_CONSTEXPR T byteswap( T x ) BOOST_NOEXCEPT