From: Ken Matsui <kmatsui@gcc.gnu.org>
To: gcc-patches@gcc.gnu.org
Cc: libstdc++@gcc.gnu.org, Ken Matsui <kmatsui@gcc.gnu.org>
Subject: [PATCH 12/14] libstdc++: Optimize std::is_signed compilation performance
Date: Wed, 10 Jan 2024 01:23:03 -0800 [thread overview]
Message-ID: <20240110194031.2384005-13-kmatsui@gcc.gnu.org> (raw)
In-Reply-To: <20240110194031.2384005-1-kmatsui@gcc.gnu.org>
This patch optimizes the compilation performance of std::is_signed
by dispatching to the new __is_signed built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_signed): Use __is_signed built-in
trait.
(is_signed_v): Likewise.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
libstdc++-v3/include/std/type_traits | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 4bcfb1389e3..b917c743aea 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -968,6 +968,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: public __bool_constant<__is_abstract(_Tp)>
{ };
+ /// is_signed
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_signed)
+ template<typename _Tp>
+ struct is_signed
+ : public __bool_constant<__is_signed(_Tp)>
+ { };
+#else
/// @cond undocumented
template<typename _Tp,
bool = is_arithmetic<_Tp>::value>
@@ -980,11 +987,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ };
/// @endcond
- /// is_signed
template<typename _Tp>
struct is_signed
: public __is_signed_helper<_Tp>::type
{ };
+#endif
/// is_unsigned
#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unsigned)
@@ -3418,8 +3425,13 @@ template <typename _Tp>
template <typename _Tp>
inline constexpr bool is_final_v = __is_final(_Tp);
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_signed)
+template <typename _Tp>
+ inline constexpr bool is_signed_v = __is_signed(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_signed_v = is_signed<_Tp>::value;
+#endif
#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unsigned)
template <typename _Tp>
--
2.43.0
next prev parent reply other threads:[~2024-01-10 19:41 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-10 9:22 [PATCH 00/14] Optimize integral-related type traits Ken Matsui
2024-01-10 9:22 ` [PATCH 01/14] c++: Implement __is_integral built-in trait Ken Matsui
2024-01-17 0:30 ` Jason Merrill
2024-01-17 7:42 ` Jonathan Wakely
2024-01-17 11:28 ` Joseph Myers
2024-01-10 9:22 ` [PATCH 02/14] libstdc++: Optimize std::is_integral compilation performance Ken Matsui
2024-01-10 21:19 ` Jonathan Wakely
2024-01-10 9:22 ` [PATCH 03/14] c++: Implement __is_floating_point built-in trait Ken Matsui
2024-01-17 0:36 ` Jason Merrill
2024-01-10 9:22 ` [PATCH 04/14] libstdc++: Optimize std::is_floating_point compilation performance Ken Matsui
2024-01-10 21:20 ` Jonathan Wakely
2024-01-10 9:22 ` [PATCH 05/14] c++: Implement __is_arithmetic built-in trait Ken Matsui
2024-01-10 9:22 ` [PATCH 06/14] libstdc++: Optimize std::is_arithmetic compilation performance Ken Matsui
2024-01-10 21:20 ` Jonathan Wakely
2024-01-10 9:22 ` [PATCH 07/14] libstdc++: Optimize std::is_fundamental " Ken Matsui
2024-01-10 9:22 ` [PATCH 08/14] libstdc++: Optimize std::is_compound " Ken Matsui
2024-01-10 21:21 ` Jonathan Wakely
2024-01-11 3:02 ` Ken Matsui
2024-01-11 4:14 ` [committed] " Ken Matsui
2024-01-10 9:23 ` [PATCH 09/14] c++: Implement __is_unsigned built-in trait Ken Matsui
2024-01-17 0:41 ` Jason Merrill
2024-01-10 9:23 ` [PATCH 10/14] libstdc++: Optimize std::is_unsigned compilation performance Ken Matsui
2024-01-10 21:22 ` Jonathan Wakely
2024-01-10 9:23 ` [PATCH 11/14] c++: Implement __is_signed built-in trait Ken Matsui
2024-01-10 9:23 ` Ken Matsui [this message]
2024-01-10 21:22 ` [PATCH 12/14] libstdc++: Optimize std::is_signed compilation performance Jonathan Wakely
2024-01-10 9:23 ` [PATCH 13/14] c++: Implement __is_scalar built-in trait Ken Matsui
2024-01-10 19:59 ` Ken Matsui
2024-01-10 9:23 ` [PATCH 14/14] libstdc++: Optimize std::is_scalar compilation performance Ken Matsui
2024-01-10 21:22 ` Jonathan Wakely
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