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[10/14] libstdc++: Optimize std::is_unsigned compilation performance

Message ID 20240110194031.2384005-11-kmatsui@gcc.gnu.org
State Accepted
Headers
Series Optimize integral-related type traits |

Commit Message

Ken Matsui Jan. 10, 2024, 9:23 a.m. UTC 
  This patch optimizes the compilation performance of std::is_unsigned
by dispatching to the new __is_unsigned built-in trait.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (is_unsigned): Use __is_unsigned
	built-in trait.
	(is_unsigned_v): Likewise.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
 libstdc++-v3/include/std/type_traits | 13 +++++++++++++
 1 file changed, 13 insertions(+)

Comments

Jonathan Wakely Jan. 10, 2024, 9:22 p.m. UTC | #1 
On Wed, 10 Jan 2024 at 19:41, Ken Matsui <kmatsui@gcc.gnu.org> wrote:
>
> This patch optimizes the compilation performance of std::is_unsigned
> by dispatching to the new __is_unsigned built-in trait.

OK for trunk (if the new built-in is approved).


>
> libstdc++-v3/ChangeLog:
>
>         * include/std/type_traits (is_unsigned): Use __is_unsigned
>         built-in trait.
>         (is_unsigned_v): Likewise.
>
> Signed-off-by: Ken Matsui <kmatsui@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 6294f5af533..4bcfb1389e3 100644
> --- a/libstdc++-v3/include/std/type_traits
> +++ b/libstdc++-v3/include/std/type_traits
> @@ -987,10 +987,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>      { };
>
>    /// is_unsigned
> +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unsigned)
> +  template<typename _Tp>
> +    struct is_unsigned
> +    : public __bool_constant<__is_unsigned(_Tp)>
> +    { };
> +#else
>    template<typename _Tp>
>      struct is_unsigned
>      : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type
>      { };
> +#endif
>
>    /// @cond undocumented
>    template<typename _Tp, typename _Up = _Tp&&>
> @@ -3413,8 +3420,14 @@ template <typename _Tp>
>
>  template <typename _Tp>
>    inline constexpr bool is_signed_v = is_signed<_Tp>::value;
> +
> +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unsigned)
> +template <typename _Tp>
> +  inline constexpr bool is_unsigned_v = __is_unsigned(_Tp);
> +#else
>  template <typename _Tp>
>    inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
> +#endif
>
>  template <typename _Tp, typename... _Args>
>    inline constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...);
> --
> 2.43.0
>
diff mbox series

Patch

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 6294f5af533..4bcfb1389e3 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -987,10 +987,17 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { };
 
   /// is_unsigned
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unsigned)
+  template<typename _Tp>
+    struct is_unsigned
+    : public __bool_constant<__is_unsigned(_Tp)>
+    { };
+#else
   template<typename _Tp>
     struct is_unsigned
     : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type
     { };
+#endif
 
   /// @cond undocumented
   template<typename _Tp, typename _Up = _Tp&&>
@@ -3413,8 +3420,14 @@  template <typename _Tp>
 
 template <typename _Tp>
   inline constexpr bool is_signed_v = is_signed<_Tp>::value;
+
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unsigned)
+template <typename _Tp>
+  inline constexpr bool is_unsigned_v = __is_unsigned(_Tp);
+#else
 template <typename _Tp>
   inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
+#endif
 
 template <typename _Tp, typename... _Args>
   inline constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...);