[PATCH v23 25/33] libstdc++: Optimize std::is_function compilation performance

[Ken Matsui]

This patch optimizes the compilation performance of std::is_function
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.
        (is_const_v): Move on top of is_function_v as is_function_v now
        depends on is_const_v.

Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
---
 libstdc++-v3/include/std/type_traits | 39 ++++++++++++++++++++--------
 1 file changed, 28 insertions(+), 11 deletions(-)

diff --git a/libstdc++-v3/include/std/type_traits 
b/libstdc++-v3/include/std/type_traits
index 36ad9814047..1e561c8ea38 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 +3276,28 @@ 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_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_function_v = is_function<_Tp>::value;
+  inline constexpr bool is_const_v<const _Tp> = true;
+#endif
+
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_function)
+template <typename _Tp>
+  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>
@@ -3303,16 +3330,6 @@ 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_volatile)
 template <typename _Tp>
   inline constexpr bool is_volatile_v = __is_volatile(_Tp);
-- 
2.42.0