[PATCH v20 32/40] libstdc++: Optimize is_arithmetic trait performance
Ken Matsui
kmatsui@gcc.gnu.org
Mon Oct 16 00:10:16 GMT 2023
This patch optimizes the performance of the is_arithmetic trait by dispatching
to the new __is_arithmetic built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_arithmetic): Use __is_arithmetic
built-in trait.
(is_arithmetic_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 3acd843f2f2..cc466e0f606 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -726,10 +726,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#endif
/// is_arithmetic
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_arithmetic)
+ template<typename _Tp>
+ struct is_arithmetic
+ : public __bool_constant<__is_arithmetic(_Tp)>
+ { };
+#else
template<typename _Tp>
struct is_arithmetic
: public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
{ };
+#endif
/// is_fundamental
template<typename _Tp>
@@ -3344,8 +3351,14 @@ template <typename _Tp>
inline constexpr bool is_reference_v<_Tp&&> = true;
#endif
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_arithmetic)
+template <typename _Tp>
+ inline constexpr bool is_arithmetic_v = __is_arithmetic(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
+#endif
+
template <typename _Tp>
inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
--
2.42.0
More information about the Libstdc++
mailing list