On Wed, 10 Jan 2024 at 19:43, Ken Matsui <kmat...@gcc.gnu.org> wrote:
>
> This patch optimizes the compilation performance of
> std::is_floating_point by dispatching to the new
> __is_floating_point built-in trait.
OK for trunk (if the new built-in is approved).
>
> libstdc++-v3/ChangeLog:
>
> * include/std/type_traits (is_floating_point): Use
> __is_floating_point built-in trait.
> (is_floating_point_v): Likewise.
>
> Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
> ---
> libstdc++-v3/include/std/type_traits | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/libstdc++-v3/include/std/type_traits
> b/libstdc++-v3/include/std/type_traits
> index afa281d9cc4..23ea70eca18 100644
> --- a/libstdc++-v3/include/std/type_traits
> +++ b/libstdc++-v3/include/std/type_traits
> @@ -470,6 +470,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> { };
> #endif
>
> +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_floating_point)
> + /// is_floating_point
> + template<typename _Tp>
> + struct is_floating_point
> + : public __bool_constant<__is_floating_point(_Tp)>
> + { };
> +#else
> /// @cond undocumented
> template<typename>
> struct __is_floating_point_helper
> @@ -529,6 +536,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> struct is_floating_point
> : public __is_floating_point_helper<__remove_cv_t<_Tp>>::type
> { };
> +#endif
>
> /// is_array
> #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_array)
> @@ -3238,8 +3246,13 @@ template <typename _Tp>
> inline constexpr bool is_integral_v = is_integral<_Tp>::value;
> #endif
>
> +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_floating_point)
> +template <typename _Tp>
> + inline constexpr bool is_floating_point_v = __is_floating_point(_Tp);
> +#else
> template <typename _Tp>
> inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
> +#endif
>
> #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_array)
> template <typename _Tp>
> --
> 2.43.0
>
