[PATCH v14 25/40] libstdc++: Optimize is_function trait performance

Ken Matsui kmatsui@gcc.gnu.org
Fri Sep 15 23:51:11 GMT 2023


This patch optimizes the performance of the is_function trait by dispatching
to the new __is_function built-in trait.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (is_function): Use __is_function built-in
	trait.
	(is_function_v): Likewise. Optimize its implementation.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
 libstdc++-v3/include/std/type_traits | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 36ad9814047..bd57488824b 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -637,6 +637,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { };
 
   /// is_function
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_function)
+  template<typename _Tp>
+    struct is_function
+    : public __bool_constant<__is_function(_Tp)>
+    { };
+#else
   template<typename _Tp>
     struct is_function
     : public __bool_constant<!is_const<const _Tp>::value> { };
@@ -648,6 +654,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp>
     struct is_function<_Tp&&>
     : public false_type { };
+#endif
 
 #ifdef __cpp_lib_is_null_pointer // C++ >= 11
   /// is_null_pointer (LWG 2247).
@@ -3269,8 +3276,18 @@ template <typename _Tp>
   inline constexpr bool is_union_v = __is_union(_Tp);
 template <typename _Tp>
   inline constexpr bool is_class_v = __is_class(_Tp);
+
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_function)
 template <typename _Tp>
-  inline constexpr bool is_function_v = is_function<_Tp>::value;
+  inline constexpr bool is_function_v = __is_function(_Tp);
+#else
+template <typename _Tp>
+  inline constexpr bool is_function_v = !is_const_v<const _Tp>;
+template <typename _Tp>
+  inline constexpr bool is_function_v<_Tp&> = false;
+template <typename _Tp>
+  inline constexpr bool is_function_v<_Tp&&> = false;
+#endif
 
 #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_reference)
 template <typename _Tp>
-- 
2.42.0



More information about the Gcc-patches mailing list