Message ID | 20240228192843.188979-3-kmatsui@gcc.gnu.org |
---|---|
State | Unresolved |
Headers |
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Series |
Optimize more type traits
|
|
Checks
Context | Check | Description |
---|---|---|
snail/gcc-patch-check | warning | Git am fail log |
Commit Message
Ken Matsui
Feb. 28, 2024, 7:26 p.m. UTC
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>
---
libstdc++-v3/include/std/type_traits | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 21402fd8c13..6e9ebfb8a18 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> @@ -3327,10 +3334,15 @@ 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>