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| author | Ken Matsui <kmatsui@gcc.gnu.org> | 2024-02-15 04:44:54 -0800 |
|---|---|---|
| committer | Ken Matsui <kmatsui@gcc.gnu.org> | 2024-06-13 05:56:36 -0700 |
| commit | 9d0dba02c5452d5906f87e59455a4c38944eb217 (patch) | |
| tree | f006b9a3529bbd15494493ee02354bd64c9ea338 | |
| parent | 66f5bebd126657ec4b430fa9bc4b8557485f469d (diff) | |
| download | gcc-9d0dba02c5452d5906f87e59455a4c38944eb217.zip gcc-9d0dba02c5452d5906f87e59455a4c38944eb217.tar.gz gcc-9d0dba02c5452d5906f87e59455a4c38944eb217.tar.bz2 | |
libstdc++: Optimize std::decay compilation performance
This patch optimizes the compilation performance of std::decay
by dispatching to the new __decay built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (decay): Use __decay built-in trait.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
Reviewed-by: Patrick Palka <ppalka@redhat.com>
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
| -rw-r--r-- | libstdc++-v3/include/std/type_traits | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 23432ac..3d158f9 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -2278,6 +2278,11 @@ _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> @@ -2309,6 +2314,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Tp> struct decay<_Tp&&> { using type = typename __decay_selector<_Tp>::type; }; +#endif /// @cond undocumented |