diff --git a/include/boost/core/bit.hpp b/include/boost/core/bit.hpp
index 2de69ac..8ea4ad8 100644
--- a/include/boost/core/bit.hpp
+++ b/include/boost/core/bit.hpp
@@ -807,6 +807,20 @@ BOOST_CONSTEXPR inline boost::uint16_t byteswap_impl( boost::uint16_t x ) BOOST_
     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::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;
 }
 
+#endif
+
 } // namespace detail
 
 template<class T> BOOST_CXX14_CONSTEXPR T byteswap( T x ) BOOST_NOEXCEPT