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Added support for __builtin_bswap16.

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This commit is contained in:
Andrey Semashev 2023-11-25 15:37:03 +03:00
parent 7cbbb08e7b
commit db0fd77af1
1 changed files with 18 additions and 0 deletions
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18
include/boost/core/bit.hpp
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@ -47,12 +47,19 @@
# if __has_builtin(__builtin_bit_cast) # if __has_builtin(__builtin_bit_cast)
# define BOOST_CORE_HAS_BUILTIN_BIT_CAST # define BOOST_CORE_HAS_BUILTIN_BIT_CAST
# endif # endif
# if __has_builtin(__builtin_bswap16)
# define BOOST_CORE_HAS_BUILTIN_BSWAP16
# endif
#endif #endif
#if defined(BOOST_MSVC) && BOOST_MSVC >= 1926 #if defined(BOOST_MSVC) && BOOST_MSVC >= 1926
# define BOOST_CORE_HAS_BUILTIN_BIT_CAST # define BOOST_CORE_HAS_BUILTIN_BIT_CAST
#endif #endif
#if !defined(BOOST_CORE_HAS_BUILTIN_BSWAP16) && (defined(BOOST_GCC_VERSION) && BOOST_GCC_VERSION >= 40800)
# define BOOST_CORE_HAS_BUILTIN_BSWAP16
#endif
namespace boost namespace boost
{ {
namespace core namespace core
@ -825,11 +832,22 @@ BOOST_CONSTEXPR inline boost::uint8_t byteswap_impl( boost::uint8_t x ) BOOST_NO
return x; return x;
} }
#if defined(BOOST_CORE_HAS_BUILTIN_BSWAP16)
BOOST_CONSTEXPR inline boost::uint16_t byteswap_impl( boost::uint16_t x ) BOOST_NOEXCEPT
{
return __builtin_bswap16( x );
}
#else
BOOST_CONSTEXPR inline boost::uint16_t byteswap_impl( boost::uint16_t x ) BOOST_NOEXCEPT BOOST_CONSTEXPR inline boost::uint16_t byteswap_impl( boost::uint16_t x ) BOOST_NOEXCEPT
{ {
return static_cast<boost::uint16_t>( x << 8 | x >> 8 ); return static_cast<boost::uint16_t>( x << 8 | x >> 8 );
} }
#endif
#if defined(__GNUC__) || defined(__clang__) #if defined(__GNUC__) || defined(__clang__)
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