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[v5,14/14] libstdc++: Optimize std::rank compilation performance

Message ID 20240215152037.720162-14-kmatsui@gcc.gnu.org
State New
Headers show
Series [v5,01/14] c++: Implement __add_pointer built-in trait | expand

Commit Message

Ken Matsui Feb. 15, 2024, 3:20 p.m. UTC 
This patch optimizes the compilation performance of std::rank
by dispatching to the new __rank built-in trait.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (rank): Use __rank built-in trait.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
 libstdc++-v3/include/std/type_traits | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 90718d772dd..5d2e6eaa2a2 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -1445,6 +1445,11 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
     };
 
   /// rank
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__rank)
+  template<typename _Tp>
+    struct rank
+    : public integral_constant<std::size_t, __rank(_Tp)> { };
+#else
   template<typename>
     struct rank
     : public integral_constant<std::size_t, 0> { };
@@ -1456,6 +1461,7 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp>
     struct rank<_Tp[]>
     : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
+#endif
 
   /// extent
   template<typename, unsigned _Uint = 0>