| Message ID | 20240511090130.248174-9-kmatsui@gcc.gnu.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v26,01/13] libstdc++: Optimize std::is_const compilation performance | expand |
On 11/05/24 02:01 -0700, Ken Matsui wrote: >This patch optimizes the compilation performance of >std::add_rvalue_reference by dispatching to the new >__add_rvalue_reference built-in trait. > >libstdc++-v3/ChangeLog: > > * include/std/type_traits (add_rvalue_reference): Use > __add_rvalue_reference built-in trait. > (__add_rvalue_reference_helper): Likewise. > >Signed-off-by: Ken Matsui <kmatsui@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 effa3fbcb75..824cad90a25 100644 >--- a/libstdc++-v3/include/std/type_traits >+++ b/libstdc++-v3/include/std/type_traits >@@ -1185,6 +1185,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION > }; > > /// @cond undocumented >+#if _GLIBCXX_USE_BUILTIN_TRAIT(__add_rvalue_reference) >+ template<typename _Tp> >+ struct __add_rvalue_reference_helper >+ { using type = __add_rvalue_reference(_Tp); }; >+#else > template<typename _Tp, typename = void> > struct __add_rvalue_reference_helper > { using type = _Tp; }; >@@ -1192,6 +1197,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION > template<typename _Tp> > struct __add_rvalue_reference_helper<_Tp, __void_t<_Tp&&>> > { using type = _Tp&&; }; >+#endif > > template<typename _Tp> > using __add_rval_ref_t = typename __add_rvalue_reference_helper<_Tp>::type; Same comment as for add_lvalue_reference. >@@ -1748,9 +1754,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION > #endif > > /// add_rvalue_reference >+#if _GLIBCXX_USE_BUILTIN_TRAIT(__add_rvalue_reference) >+ template<typename _Tp> >+ struct add_rvalue_reference >+ { using type = __add_rvalue_reference(_Tp); }; >+#else > template<typename _Tp> > struct add_rvalue_reference > { using type = __add_rval_ref_t<_Tp>; }; >+#endif > > #if __cplusplus > 201103L > /// Alias template for remove_reference >-- >2.44.0 >
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index effa3fbcb75..824cad90a25 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -1185,6 +1185,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION }; /// @cond undocumented +#if _GLIBCXX_USE_BUILTIN_TRAIT(__add_rvalue_reference) + template<typename _Tp> + struct __add_rvalue_reference_helper + { using type = __add_rvalue_reference(_Tp); }; +#else template<typename _Tp, typename = void> struct __add_rvalue_reference_helper { using type = _Tp; }; @@ -1192,6 +1197,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Tp> struct __add_rvalue_reference_helper<_Tp, __void_t<_Tp&&>> { using type = _Tp&&; }; +#endif template<typename _Tp> using __add_rval_ref_t = typename __add_rvalue_reference_helper<_Tp>::type; @@ -1748,9 +1754,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION #endif /// add_rvalue_reference +#if _GLIBCXX_USE_BUILTIN_TRAIT(__add_rvalue_reference) + template<typename _Tp> + struct add_rvalue_reference + { using type = __add_rvalue_reference(_Tp); }; +#else template<typename _Tp> struct add_rvalue_reference { using type = __add_rval_ref_t<_Tp>; }; +#endif #if __cplusplus > 201103L /// Alias template for remove_reference
This patch optimizes the compilation performance of std::add_rvalue_reference by dispatching to the new __add_rvalue_reference built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (add_rvalue_reference): Use __add_rvalue_reference built-in trait. (__add_rvalue_reference_helper): Likewise. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> --- libstdc++-v3/include/std/type_traits | 12 ++++++++++++ 1 file changed, 12 insertions(+)