Message ID | 20231010095229.3364786-40-kmatsui@gcc.gnu.org |
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State | Unresolved |
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Series |
Optimize type traits performance
|
|
Checks
Context | Check | Description |
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snail/gcc-patch-check | warning | Git am fail log |
Commit Message
Ken Matsui
Oct. 10, 2023, 9:46 a.m. UTC
This patch optimizes the performance of the is_scalar trait by dispatching to
the new __is_scalar built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_scalar): Use __is_scalar built-in
trait.
(is_scalar_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 7e93923f44b..eb16a642575 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -775,11 +775,18 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION struct is_member_pointer; /// is_scalar +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_scalar) + template<typename _Tp> + struct is_scalar + : public __bool_constant<__is_scalar(_Tp)> + { }; +#else template<typename _Tp> struct is_scalar : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type { }; +#endif /// is_compound template<typename _Tp> @@ -3398,8 +3405,14 @@ template <typename _Tp> inline constexpr bool is_object_v = is_object<_Tp>::value; #endif +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_scalar) +template <typename _Tp> + inline constexpr bool is_scalar_v = __is_scalar(_Tp); +#else template <typename _Tp> inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; +#endif + template <typename _Tp> inline constexpr bool is_compound_v = !is_fundamental_v<_Tp>;