diff options
Diffstat (limited to 'contrib/llvm-project/libcxx/include/__compare/strong_order.h')
| -rw-r--r-- | contrib/llvm-project/libcxx/include/__compare/strong_order.h | 173 |
1 files changed, 86 insertions, 87 deletions
diff --git a/contrib/llvm-project/libcxx/include/__compare/strong_order.h b/contrib/llvm-project/libcxx/include/__compare/strong_order.h index cbfcf7316de9..5f6ade5aef8e 100644 --- a/contrib/llvm-project/libcxx/include/__compare/strong_order.h +++ b/contrib/llvm-project/libcxx/include/__compare/strong_order.h @@ -34,100 +34,99 @@ _LIBCPP_BEGIN_NAMESPACE_STD // [cmp.alg] namespace __strong_order { - struct __fn { - // NOLINTBEGIN(libcpp-robust-against-adl) strong_order should use ADL, but only here - template<class _Tp, class _Up> - requires is_same_v<decay_t<_Tp>, decay_t<_Up>> - _LIBCPP_HIDE_FROM_ABI static constexpr auto - __go(_Tp&& __t, _Up&& __u, __priority_tag<2>) - noexcept(noexcept(strong_ordering(strong_order(std::forward<_Tp>(__t), std::forward<_Up>(__u))))) - -> decltype( strong_ordering(strong_order(std::forward<_Tp>(__t), std::forward<_Up>(__u)))) - { return strong_ordering(strong_order(std::forward<_Tp>(__t), std::forward<_Up>(__u))); } - // NOLINTEND(libcpp-robust-against-adl) +struct __fn { + // NOLINTBEGIN(libcpp-robust-against-adl) strong_order should use ADL, but only here + template <class _Tp, class _Up> + requires is_same_v<decay_t<_Tp>, decay_t<_Up>> + _LIBCPP_HIDE_FROM_ABI static constexpr auto __go(_Tp&& __t, _Up&& __u, __priority_tag<2>) noexcept( + noexcept(strong_ordering(strong_order(std::forward<_Tp>(__t), std::forward<_Up>(__u))))) + -> decltype(strong_ordering(strong_order(std::forward<_Tp>(__t), std::forward<_Up>(__u)))) { + return strong_ordering(strong_order(std::forward<_Tp>(__t), std::forward<_Up>(__u))); + } + // NOLINTEND(libcpp-robust-against-adl) - template<class _Tp, class _Up, class _Dp = decay_t<_Tp>> - requires is_same_v<_Dp, decay_t<_Up>> && is_floating_point_v<_Dp> - _LIBCPP_HIDE_FROM_ABI static constexpr strong_ordering - __go(_Tp&& __t, _Up&& __u, __priority_tag<1>) noexcept - { - if constexpr (numeric_limits<_Dp>::is_iec559 && sizeof(_Dp) == sizeof(int32_t)) { - int32_t __rx = std::bit_cast<int32_t>(__t); - int32_t __ry = std::bit_cast<int32_t>(__u); - __rx = (__rx < 0) ? (numeric_limits<int32_t>::min() - __rx - 1) : __rx; - __ry = (__ry < 0) ? (numeric_limits<int32_t>::min() - __ry - 1) : __ry; - return (__rx <=> __ry); - } else if constexpr (numeric_limits<_Dp>::is_iec559 && sizeof(_Dp) == sizeof(int64_t)) { - int64_t __rx = std::bit_cast<int64_t>(__t); - int64_t __ry = std::bit_cast<int64_t>(__u); - __rx = (__rx < 0) ? (numeric_limits<int64_t>::min() - __rx - 1) : __rx; - __ry = (__ry < 0) ? (numeric_limits<int64_t>::min() - __ry - 1) : __ry; - return (__rx <=> __ry); - } else if (__t < __u) { - return strong_ordering::less; - } else if (__t > __u) { - return strong_ordering::greater; - } else if (__t == __u) { - if constexpr (numeric_limits<_Dp>::radix == 2) { - return std::signbit(__u) <=> std::signbit(__t); - } else { - // This is bullet 3 of the IEEE754 algorithm, relevant - // only for decimal floating-point; - // see https://stackoverflow.com/questions/69068075/ - if (__t == 0 || std::isinf(__t)) { - return std::signbit(__u) <=> std::signbit(__t); - } else { - int __texp, __uexp; - (void)std::frexp(__t, &__texp); - (void)std::frexp(__u, &__uexp); - return (__t < 0) ? (__texp <=> __uexp) : (__uexp <=> __texp); - } - } - } else { - // They're unordered, so one of them must be a NAN. - // The order is -QNAN, -SNAN, numbers, +SNAN, +QNAN. - bool __t_is_nan = std::isnan(__t); - bool __u_is_nan = std::isnan(__u); - bool __t_is_negative = std::signbit(__t); - bool __u_is_negative = std::signbit(__u); - using _IntType = conditional_t< - sizeof(__t) == sizeof(int32_t), int32_t, conditional_t< - sizeof(__t) == sizeof(int64_t), int64_t, void> - >; - if constexpr (is_same_v<_IntType, void>) { - static_assert(sizeof(_Dp) == 0, "std::strong_order is unimplemented for this floating-point type"); - } else if (__t_is_nan && __u_is_nan) { - // Order by sign bit, then by "payload bits" (we'll just use bit_cast). - if (__t_is_negative != __u_is_negative) { - return (__u_is_negative <=> __t_is_negative); - } else { - return std::bit_cast<_IntType>(__t) <=> std::bit_cast<_IntType>(__u); - } - } else if (__t_is_nan) { - return __t_is_negative ? strong_ordering::less : strong_ordering::greater; - } else { - return __u_is_negative ? strong_ordering::greater : strong_ordering::less; - } - } + template <class _Tp, class _Up, class _Dp = decay_t<_Tp>> + requires is_same_v<_Dp, decay_t<_Up>> && is_floating_point_v<_Dp> + _LIBCPP_HIDE_FROM_ABI static constexpr strong_ordering __go(_Tp&& __t, _Up&& __u, __priority_tag<1>) noexcept { + if constexpr (numeric_limits<_Dp>::is_iec559 && sizeof(_Dp) == sizeof(int32_t)) { + int32_t __rx = std::bit_cast<int32_t>(__t); + int32_t __ry = std::bit_cast<int32_t>(__u); + __rx = (__rx < 0) ? (numeric_limits<int32_t>::min() - __rx - 1) : __rx; + __ry = (__ry < 0) ? (numeric_limits<int32_t>::min() - __ry - 1) : __ry; + return (__rx <=> __ry); + } else if constexpr (numeric_limits<_Dp>::is_iec559 && sizeof(_Dp) == sizeof(int64_t)) { + int64_t __rx = std::bit_cast<int64_t>(__t); + int64_t __ry = std::bit_cast<int64_t>(__u); + __rx = (__rx < 0) ? (numeric_limits<int64_t>::min() - __rx - 1) : __rx; + __ry = (__ry < 0) ? (numeric_limits<int64_t>::min() - __ry - 1) : __ry; + return (__rx <=> __ry); + } else if (__t < __u) { + return strong_ordering::less; + } else if (__t > __u) { + return strong_ordering::greater; + } else if (__t == __u) { + if constexpr (numeric_limits<_Dp>::radix == 2) { + return std::signbit(__u) <=> std::signbit(__t); + } else { + // This is bullet 3 of the IEEE754 algorithm, relevant + // only for decimal floating-point; + // see https://stackoverflow.com/questions/69068075/ + if (__t == 0 || std::isinf(__t)) { + return std::signbit(__u) <=> std::signbit(__t); + } else { + int __texp, __uexp; + (void)std::frexp(__t, &__texp); + (void)std::frexp(__u, &__uexp); + return (__t < 0) ? (__texp <=> __uexp) : (__uexp <=> __texp); } + } + } else { + // They're unordered, so one of them must be a NAN. + // The order is -QNAN, -SNAN, numbers, +SNAN, +QNAN. + bool __t_is_nan = std::isnan(__t); + bool __u_is_nan = std::isnan(__u); + bool __t_is_negative = std::signbit(__t); + bool __u_is_negative = std::signbit(__u); + using _IntType = + conditional_t< sizeof(__t) == sizeof(int32_t), + int32_t, + conditional_t< sizeof(__t) == sizeof(int64_t), int64_t, void> >; + if constexpr (is_same_v<_IntType, void>) { + static_assert(sizeof(_Dp) == 0, "std::strong_order is unimplemented for this floating-point type"); + } else if (__t_is_nan && __u_is_nan) { + // Order by sign bit, then by "payload bits" (we'll just use bit_cast). + if (__t_is_negative != __u_is_negative) { + return (__u_is_negative <=> __t_is_negative); + } else { + return std::bit_cast<_IntType>(__t) <=> std::bit_cast<_IntType>(__u); + } + } else if (__t_is_nan) { + return __t_is_negative ? strong_ordering::less : strong_ordering::greater; + } else { + return __u_is_negative ? strong_ordering::greater : strong_ordering::less; + } + } + } - template<class _Tp, class _Up> - requires is_same_v<decay_t<_Tp>, decay_t<_Up>> - _LIBCPP_HIDE_FROM_ABI static constexpr auto - __go(_Tp&& __t, _Up&& __u, __priority_tag<0>) - noexcept(noexcept(strong_ordering(compare_three_way()(std::forward<_Tp>(__t), std::forward<_Up>(__u))))) - -> decltype( strong_ordering(compare_three_way()(std::forward<_Tp>(__t), std::forward<_Up>(__u)))) - { return strong_ordering(compare_three_way()(std::forward<_Tp>(__t), std::forward<_Up>(__u))); } + template <class _Tp, class _Up> + requires is_same_v<decay_t<_Tp>, decay_t<_Up>> + _LIBCPP_HIDE_FROM_ABI static constexpr auto __go(_Tp&& __t, _Up&& __u, __priority_tag<0>) noexcept( + noexcept(strong_ordering(compare_three_way()(std::forward<_Tp>(__t), std::forward<_Up>(__u))))) + -> decltype(strong_ordering(compare_three_way()(std::forward<_Tp>(__t), std::forward<_Up>(__u)))) { + return strong_ordering(compare_three_way()(std::forward<_Tp>(__t), std::forward<_Up>(__u))); + } - template<class _Tp, class _Up> - _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t, _Up&& __u) const - noexcept(noexcept(__go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<2>()))) - -> decltype( __go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<2>())) - { return __go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<2>()); } - }; + template <class _Tp, class _Up> + _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t, _Up&& __u) const + noexcept(noexcept(__go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<2>()))) + -> decltype(__go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<2>())) { + return __go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<2>()); + } +}; } // namespace __strong_order inline namespace __cpo { - inline constexpr auto strong_order = __strong_order::__fn{}; +inline constexpr auto strong_order = __strong_order::__fn{}; } // namespace __cpo #endif // _LIBCPP_STD_VER >= 20 |