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* [gcc r14-6629] libstdc++: Optimize std::is_reference compilation performance
@ 2023-12-16 17:00 Ken Matsui
0 siblings, 0 replies; only message in thread
From: Ken Matsui @ 2023-12-16 17:00 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:e86cfcaef246331ee7956dd86c156d594768fe70
commit r14-6629-ge86cfcaef246331ee7956dd86c156d594768fe70
Author: Ken Matsui <kmatsui@gcc.gnu.org>
Date: Sat Mar 25 04:23:19 2023 -0700
libstdc++: Optimize std::is_reference compilation performance
This patch optimizes the compilation performance of std::is_reference
by dispatching to the new __is_reference built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_reference): Use __is_reference
built-in trait.
(is_reference_v): Likewise.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
Diff:
---
libstdc++-v3/include/std/type_traits | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 1edd05acb4c..db880d87f60 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -682,6 +682,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Composite type categories.
/// is_reference
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_reference)
+ template<typename _Tp>
+ struct is_reference
+ : public __bool_constant<__is_reference(_Tp)>
+ { };
+#else
template<typename _Tp>
struct is_reference
: public false_type
@@ -696,6 +702,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct is_reference<_Tp&&>
: public true_type
{ };
+#endif
/// is_arithmetic
template<typename _Tp>
@@ -3250,12 +3257,19 @@ template <typename _Tp>
inline constexpr bool is_class_v = __is_class(_Tp);
template <typename _Tp>
inline constexpr bool is_function_v = is_function<_Tp>::value;
+
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_reference)
+template <typename _Tp>
+ inline constexpr bool is_reference_v = __is_reference(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_reference_v = false;
template <typename _Tp>
inline constexpr bool is_reference_v<_Tp&> = true;
template <typename _Tp>
inline constexpr bool is_reference_v<_Tp&&> = true;
+#endif
+
template <typename _Tp>
inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
template <typename _Tp>
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