Message ID | 20230915023640.75216-24-kmatsui@gcc.gnu.org |
---|---|
State | Unresolved |
Headers |
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Series |
Optimize type traits performance
|
|
Checks
Context | Check | Description |
---|---|---|
snail/gcc-patch-check | warning | Git am fail log |
Commit Message
Ken Matsui
Sept. 15, 2023, 2:35 a.m. UTC
This patch optimizes the performance of the is_reference trait by dispatching
to the new __is_reference built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_reference): Use __is_reference built-in
trait.
(is_reference_v): Likewise.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
libstdc++-v3/include/std/type_traits | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 792213ebfe8..36ad9814047 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -682,6 +682,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION // Composite type categories. /// is_reference +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_reference) + template<typename _Tp> + struct is_reference + : public __bool_constant<__is_reference(_Tp)> + { }; +#else template<typename _Tp> struct is_reference : public false_type @@ -696,6 +702,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION struct is_reference<_Tp&&> : public true_type { }; +#endif /// is_arithmetic template<typename _Tp> @@ -3264,12 +3271,19 @@ template <typename _Tp> inline constexpr bool is_class_v = __is_class(_Tp); template <typename _Tp> inline constexpr bool is_function_v = is_function<_Tp>::value; + +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_reference) +template <typename _Tp> + inline constexpr bool is_reference_v = __is_reference(_Tp); +#else template <typename _Tp> inline constexpr bool is_reference_v = false; template <typename _Tp> inline constexpr bool is_reference_v<_Tp&> = true; template <typename _Tp> inline constexpr bool is_reference_v<_Tp&&> = true; +#endif + template <typename _Tp> inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; template <typename _Tp>