On 11/05/24 02:01 -0700, Ken Matsui wrote:
This patch optimizes the compilation performance of std::decay
by dispatching to the new __decay built-in trait.
OK, thanks.
libstdc++-v3/ChangeLog:
* include/std/type_traits (decay): Use __decay built-in trait.
Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
---
libstdc++-v3/include/std/type_traits | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libstdc++-v3/include/std/type_traits
b/libstdc++-v3/include/std/type_traits
index 824cad90a25..4cc587d4e08 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -2316,6 +2316,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// @cond undocumented
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__decay)
+ template<typename _Tp>
+ struct decay
+ { using type = __decay(_Tp); };
+#else
// Decay trait for arrays and functions, used for perfect forwarding
// in make_pair, make_tuple, etc.
template<typename _Up>
@@ -2347,6 +2352,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _Tp>
struct decay<_Tp&&>
{ using type = typename __decay_selector<_Tp>::type; };
+#endif
/// @cond undocumented
--
2.44.0
