Message ID | 20231011215049.1052142-36-kmatsui@gcc.gnu.org |
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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
Oct. 11, 2023, 9:46 p.m. UTC
This patch optimizes the performance of the is_unsigned trait by dispatching
to the new __is_unsigned built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_unsigned): Use __is_unsigned built-in
trait.
(is_unsigned_v): Likewise.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
libstdc++-v3/include/std/type_traits | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 48d630a1478..f7d3815f332 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -1001,10 +1001,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION { }; /// is_unsigned +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unsigned) + template<typename _Tp> + struct is_unsigned + : public __bool_constant<__is_unsigned(_Tp)> + { }; +#else template<typename _Tp> struct is_unsigned : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type { }; +#endif /// @cond undocumented template<typename _Tp, typename _Up = _Tp&&> @@ -3440,8 +3447,14 @@ template <typename _Tp> template <typename _Tp> inline constexpr bool is_signed_v = is_signed<_Tp>::value; + +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unsigned) +template <typename _Tp> + inline constexpr bool is_unsigned_v = __is_unsigned(_Tp); +#else template <typename _Tp> inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value; +#endif template <typename _Tp, typename... _Args> inline constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...);