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| author | Ken Matsui <kmatsui@gcc.gnu.org> | 2023-03-21 17:09:34 -0700 |
|---|---|---|
| committer | Ken Matsui <kmatsui@gcc.gnu.org> | 2024-06-13 05:55:36 -0700 |
| commit | eea62ce6fbcffb8acc227e5dbed74d2b627ce84d (patch) | |
| tree | 3c88b33d7b966bdea4b617ee1a8a2309b7338bc3 | |
| parent | 0970ff46ba6330fc80e8736fc05b2eaeeae0b6a0 (diff) | |
| download | gcc-eea62ce6fbcffb8acc227e5dbed74d2b627ce84d.zip gcc-eea62ce6fbcffb8acc227e5dbed74d2b627ce84d.tar.gz gcc-eea62ce6fbcffb8acc227e5dbed74d2b627ce84d.tar.bz2 | |
libstdc++: Optimize std::is_const compilation performance
This patch optimizes the compilation performance of std::is_const
by dispatching to the new __is_const built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_const): Use __is_const built-in
trait.
(is_const_v): Likewise.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
Reviewed-by: Patrick Palka <ppalka@redhat.com>
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
| -rw-r--r-- | libstdc++-v3/include/std/type_traits | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index b441bf9..8df0cf3 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -835,6 +835,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION // Type properties. /// is_const +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_const) + template<typename _Tp> + struct is_const + : public __bool_constant<__is_const(_Tp)> + { }; +#else template<typename> struct is_const : public false_type { }; @@ -842,6 +848,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Tp> struct is_const<_Tp const> : public true_type { }; +#endif /// is_volatile template<typename> @@ -3331,10 +3338,15 @@ template <typename _Tp> inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; #endif +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_const) +template <typename _Tp> + inline constexpr bool is_const_v = __is_const(_Tp); +#else template <typename _Tp> inline constexpr bool is_const_v = false; template <typename _Tp> inline constexpr bool is_const_v<const _Tp> = true; +#endif #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_function) template <typename _Tp> |