Message ID | 20240219135129.3635809-16-kmatsui@gcc.gnu.org |
---|---|
State | Unresolved |
Headers |
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Series |
[v7,01/22] c++: Implement __is_const built-in trait
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Checks
Context | Check | Description |
---|---|---|
snail/gcc-patch-check | warning | Git am fail log |
Commit Message
Ken Matsui
Feb. 19, 2024, 1:51 p.m. UTC
This patch optimizes the compilation performance of
std::add_lvalue_reference by dispatching to the new
__add_lvalue_reference built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (add_lvalue_reference): Use
__add_lvalue_reference built-in trait.
(__add_lvalue_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 34475e6279a..17bf47d59d3 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -1157,6 +1157,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION }; /// @cond undocumented +#if _GLIBCXX_USE_BUILTIN_TRAIT(__add_lvalue_reference) + template<typename _Tp> + struct __add_lvalue_reference_helper + { using type = __add_lvalue_reference(_Tp); }; +#else template<typename _Tp, typename = void> struct __add_lvalue_reference_helper { using type = _Tp; }; @@ -1164,6 +1169,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Tp> struct __add_lvalue_reference_helper<_Tp, __void_t<_Tp&>> { using type = _Tp&; }; +#endif template<typename _Tp> using __add_lval_ref_t = typename __add_lvalue_reference_helper<_Tp>::type; @@ -1731,9 +1737,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION #endif /// add_lvalue_reference +#if _GLIBCXX_USE_BUILTIN_TRAIT(__add_lvalue_reference) + template<typename _Tp> + struct add_lvalue_reference + { using type = __add_lvalue_reference(_Tp); }; +#else template<typename _Tp> struct add_lvalue_reference { using type = __add_lval_ref_t<_Tp>; }; +#endif /// add_rvalue_reference template<typename _Tp>