[PATCH v19 07/40] libstdc++: Optimize is_volatile trait performance

[Ken Matsui]

This patch optimizes the performance of the is_volatile trait by dispatching
to the new __is_volatile built-in trait.

libstdc++-v3/ChangeLog:

        * include/std/type_traits (is_volatile): Use __is_volatile built-in
        trait.
        (is_volatile_v): Likewise.

Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
---
 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 686e38e47c3..c01f65df22b 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -800,6 +800,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif
 
   /// is_volatile
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_volatile)
+  template<typename _Tp>
+    struct is_volatile
+    : public __bool_constant<__is_volatile(_Tp)>
+    { };
+#else
   template<typename>
     struct is_volatile
     : public false_type { };
@@ -807,6 +813,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp>
     struct is_volatile<_Tp volatile>
     : public true_type { };
+#endif
 
   /// is_trivial
   template<typename _Tp>
@@ -3236,10 +3243,15 @@ 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);
+#else
 template <typename _Tp>
   inline constexpr bool is_volatile_v = false;
 template <typename _Tp>
   inline constexpr bool is_volatile_v<volatile _Tp> = true;
+#endif
 
 template <typename _Tp>
   inline constexpr bool is_trivial_v = __is_trivial(_Tp);
-- 
2.42.0