On Wed, 10 Jan 2024 at 19:41, Ken Matsui <kmat...@gcc.gnu.org> wrote:
>
> This patch optimizes the compilation performance of std::is_compound
> by dispatching to the new __is_arithmetic built-in trait.
OK for trunk (no need to wait for anything else to be approved).
>
> libstdc++-v3/ChangeLog:
>
> * include/std/type_traits (is_compound): Do not use __not_.
> (is_compound_v): Use is_fundamental_v instead.
>
> Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
> ---
> libstdc++-v3/include/std/type_traits | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libstdc++-v3/include/std/type_traits
> b/libstdc++-v3/include/std/type_traits
> index 1c560d97e85..6294f5af533 100644
> --- a/libstdc++-v3/include/std/type_traits
> +++ b/libstdc++-v3/include/std/type_traits
> @@ -784,7 +784,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> /// is_compound
> template<typename _Tp>
> struct is_compound
> - : public __not_<is_fundamental<_Tp>>::type { };
> + : public __bool_constant<!is_fundamental<_Tp>::value> { };
>
> /// is_member_pointer
> #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_pointer)
> @@ -3358,7 +3358,7 @@ template <typename _Tp>
> template <typename _Tp>
> inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
> template <typename _Tp>
> - inline constexpr bool is_compound_v = is_compound<_Tp>::value;
> + inline constexpr bool is_compound_v = !is_fundamental_v<_Tp>;
>
> #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_pointer)
> template <typename _Tp>
> --
> 2.43.0
>
