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* [gcc r14-6623] libstdc++: Optimize std::is_array compilation performance
@ 2023-12-16 17:00 Ken Matsui
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From: Ken Matsui @ 2023-12-16 17:00 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:7fd9c349e455345a8b94d8fcee1c92b5c92873a5
commit r14-6623-g7fd9c349e455345a8b94d8fcee1c92b5c92873a5
Author: Ken Matsui <kmatsui@gcc.gnu.org>
Date: Tue Mar 21 08:57:14 2023 -0700
libstdc++: Optimize std::is_array compilation performance
This patch optimizes the compilation performance of std::is_array
by dispatching to the new __is_array built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_array): Use __is_array built-in
trait.
(is_array_v): Likewise.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
Diff:
---
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 677cd934b94..64f9d67fe29 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -523,6 +523,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ };
/// is_array
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_array)
+ template<typename _Tp>
+ struct is_array
+ : public __bool_constant<__is_array(_Tp)>
+ { };
+#else
template<typename>
struct is_array
: public false_type { };
@@ -534,6 +540,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Tp>
struct is_array<_Tp[]>
: public true_type { };
+#endif
template<typename>
struct __is_pointer_helper
@@ -3169,12 +3176,17 @@ template <typename _Tp>
template <typename _Tp>
inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_array)
+template <typename _Tp>
+ inline constexpr bool is_array_v = __is_array(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_array_v = false;
template <typename _Tp>
inline constexpr bool is_array_v<_Tp[]> = true;
template <typename _Tp, size_t _Num>
inline constexpr bool is_array_v<_Tp[_Num]> = true;
+#endif
template <typename _Tp>
inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
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