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| author | Ken Matsui <kmatsui@gcc.gnu.org> | 2023-03-25 04:23:19 -0700 |
|---|---|---|
| committer | Ken Matsui <kmatsui@gcc.gnu.org> | 2023-12-16 08:59:36 -0800 |
| commit | e86cfcaef246331ee7956dd86c156d594768fe70 (patch) | |
| tree | 04a6f6d66e16828c65ee72dfdd653a78b804824f | |
| parent | fa454b8dd0346a1821338e2cfcf27c9cff0f1b5c (diff) | |
| download | gcc-e86cfcaef246331ee7956dd86c156d594768fe70.zip gcc-e86cfcaef246331ee7956dd86c156d594768fe70.tar.gz gcc-e86cfcaef246331ee7956dd86c156d594768fe70.tar.bz2 | |
libstdc++: Optimize std::is_reference compilation performance
This patch optimizes the compilation performance of std::is_reference
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>
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
| -rw-r--r-- | libstdc++-v3/include/std/type_traits | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 1edd05a..db880d8 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> @@ -3250,12 +3257,19 @@ 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> |