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Add __int128 support to endian_reverse

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This commit is contained in:
Peter Dimov
2019-10-20 21:28:38 +03:00
parent b2faa783ad
commit fbc198e75d
3 changed files with 89 additions and 2 deletions
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14
include/boost/endian/detail/endian_reverse.hpp
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@ -62,7 +62,7 @@ inline uint16_t BOOST_ENDIAN_CONSTEXPR endian_reverse_impl( uint16_t x ) BOOST_N
#endif
}
inline uint32_t BOOST_ENDIAN_CONSTEXPR endian_reverse_impl(uint32_t x) BOOST_NOEXCEPT
inline uint32_t BOOST_ENDIAN_CONSTEXPR endian_reverse_impl( uint32_t x ) BOOST_NOEXCEPT
{
#ifdef BOOST_ENDIAN_NO_INTRINSICS
@ -76,7 +76,7 @@ inline uint32_t BOOST_ENDIAN_CONSTEXPR endian_reverse_impl(uint32_t x) BOOST_NOE
#endif
}
inline uint64_t BOOST_ENDIAN_CONSTEXPR endian_reverse_impl(uint64_t x) BOOST_NOEXCEPT
inline uint64_t BOOST_ENDIAN_CONSTEXPR endian_reverse_impl( uint64_t x ) BOOST_NOEXCEPT
{
#ifdef BOOST_ENDIAN_NO_INTRINSICS
@ -91,6 +91,16 @@ inline uint64_t BOOST_ENDIAN_CONSTEXPR endian_reverse_impl(uint64_t x) BOOST_NOE
# endif
}
#if defined(BOOST_HAS_INT128)
inline uint128_type BOOST_ENDIAN_CONSTEXPR endian_reverse_impl( uint128_type x ) BOOST_NOEXCEPT
{
return endian_reverse_impl( static_cast<uint64_t>( x >> 64 ) ) |
static_cast<uint128_type>( endian_reverse_impl( static_cast<uint64_t>( x ) ) ) << 64;
}
#endif
} // namespace detail
// Requires:

10
include/boost/endian/detail/integral_by_size.hpp
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@ -7,6 +7,7 @@
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/cstdint.hpp>
#include <boost/config.hpp>
#include <cstddef>
namespace boost
@ -40,6 +41,15 @@ template<> struct integral_by_size<8>
typedef uint64_t type;
};
#if defined(BOOST_HAS_INT128)
template<> struct integral_by_size<16>
{
typedef uint128_type type;
};
#endif
} // namespace detail
} // namespace endian
} // namespace boost

67
test/endian_reverse_test.cpp
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@ -72,6 +72,24 @@ template<class T> T const test_value<T, 8>::w1;
template<class T> T const test_value<T, 8>::v2;
template<class T> T const test_value<T, 8>::w2;
#if defined(BOOST_HAS_INT128)
template<class T> struct test_value<T, 16>
{
static const T v1 = static_cast<T>( 0x1F2E3D4C5B6A7988ull ) << 64 | static_cast<T>( 0xF1E2D3C4B5A69780ull );
static const T w1 = static_cast<T>( 0x8097A6B5C4D3E2F1ull ) << 64 | static_cast<T>( 0x88796A5B4C3D2E1Full );
static const T v2 = static_cast<T>( 0xF1E2D3C4B5A69788ull ) << 64 | static_cast<T>( 0x1F2E3D4C5B6A7980ull );
static const T w2 = static_cast<T>( 0x80796A5B4C3D2E1Full ) << 64 | static_cast<T>( 0x8897A6B5C4D3E2F1ull );
};
template<class T> T const test_value<T, 16>::v1;
template<class T> T const test_value<T, 16>::w1;
template<class T> T const test_value<T, 16>::v2;
template<class T> T const test_value<T, 16>::w2;
#endif // #if defined(BOOST_HAS_INT128)
template<class T> void test()
{
using boost::endian::endian_reverse;
@ -114,6 +132,48 @@ template<class T> void test()
}
}
template<class T> void test_np()
{
using boost::endian::endian_reverse;
using boost::endian::endian_reverse_inplace;
{
T t1 = test_value<T>::v1;
T t2 = endian_reverse( t1 );
BOOST_TEST( t2 == test_value<T>::w1 );
T t3 = endian_reverse( t2 );
BOOST_TEST( t3 == t1 );
T t4 = t1;
endian_reverse_inplace( t4 );
BOOST_TEST( t4 == test_value<T>::w1 );
endian_reverse_inplace( t4 );
BOOST_TEST( t4 == t1 );
}
{
T t1 = test_value<T>::v2;
T t2 = endian_reverse( t1 );
BOOST_TEST( t2 == test_value<T>::w2 );
T t3 = endian_reverse( t2 );
BOOST_TEST( t3 == t1 );
T t4 = t1;
endian_reverse_inplace( t4 );
BOOST_TEST( t4 == test_value<T>::w2 );
endian_reverse_inplace( t4 );
BOOST_TEST( t4 == t1 );
}
}
int main()
{
test<boost::int8_t>();
@ -152,5 +212,12 @@ int main()
test<char32_t>();
#endif
#if defined(BOOST_HAS_INT128)
test_np<boost::int128_type>();
test_np<boost::uint128_type>();
#endif
return boost::report_errors();
}