https://gcc.gnu.org/g:24da955ab442107909a06f3ef722f4dbf6751236
commit r15-1248-g24da955ab442107909a06f3ef722f4dbf6751236
Author: Ken Matsui <kmat...@gcc.gnu.org>
Date: Wed Feb 14 03:42:33 2024 -0800
libstdc++: Optimize std::add_pointer compilation performance
This patch optimizes the compilation performance of std::add_pointer
by dispatching to the new __add_pointer built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (add_pointer): Use __add_pointer
built-in trait.
Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
Reviewed-by: Patrick Palka <ppa...@redhat.com>
Reviewed-by: Jonathan Wakely <jwak...@redhat.com>
Diff:
---
libstdc++-v3/include/std/type_traits | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/std/type_traits
b/libstdc++-v3/include/std/type_traits
index efbe273d38a9..e179015be934 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -2135,6 +2135,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ };
#endif
+ /// add_pointer
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__add_pointer)
+ template<typename _Tp>
+ struct add_pointer
+ { using type = __add_pointer(_Tp); };
+#else
template<typename _Tp, typename = void>
struct __add_pointer_helper
{ using type = _Tp; };
@@ -2143,7 +2149,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct __add_pointer_helper<_Tp, __void_t<_Tp*>>
{ using type = _Tp*; };
- /// add_pointer
template<typename _Tp>
struct add_pointer
: public __add_pointer_helper<_Tp>
@@ -2156,6 +2161,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Tp>
struct add_pointer<_Tp&&>
{ using type = _Tp*; };
+#endif
#if __cplusplus > 201103L
/// Alias template for remove_pointer
