[PATCH v16 33/39] libstdc++: Optimize is_compound trait performance
Ken Matsui
kmatsui@gcc.gnu.org
Tue Oct 10 22:10:24 GMT 2023
This patch optimizes the performance of the is_compound trait by dispatching
to the new __is_arithmetic built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_compound): Do not use __not_.
(is_compound_v): Use is_fundamental_v instead.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
libstdc++-v3/include/std/type_traits | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 88171e1a672..48d630a1478 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -784,7 +784,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// is_compound
template<typename _Tp>
struct is_compound
- : public __not_<is_fundamental<_Tp>>::type { };
+ : public __bool_constant<!is_fundamental<_Tp>::value> { };
/// is_member_pointer
#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_pointer)
@@ -3387,7 +3387,7 @@ template <typename _Tp>
template <typename _Tp>
inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
template <typename _Tp>
- inline constexpr bool is_compound_v = is_compound<_Tp>::value;
+ inline constexpr bool is_compound_v = !is_fundamental_v<_Tp>;
#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_pointer)
template <typename _Tp>
--
2.42.0
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