From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 7934) id 05EC438708FF; Sat, 16 Dec 2023 17:00:40 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 05EC438708FF DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1702746040; bh=I+DhDp229VfT8Foijvlz7nCid4h4BTBph06aX+yr0mo=; h=From:To:Subject:Date:From; b=n69/NWVzVMUs1lVPB9RA0Zm7hQnMJLs0RR+l/VVy5wFvWpkNeegvv7SQO8dJ4NmQG Jko/qVyEn/hgw0fiTWy91wsWPyWroadogKksK1Sr39AGh6RDfmFQGeJs93cclRGvLF dYSqDTRyq1kBUHGWfsRxce1WLVjw0dH99HysUkPw= MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Ken Matsui To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r14-6629] libstdc++: Optimize std::is_reference compilation performance X-Act-Checkin: gcc X-Git-Author: Ken Matsui X-Git-Refname: refs/heads/master X-Git-Oldrev: fa454b8dd0346a1821338e2cfcf27c9cff0f1b5c X-Git-Newrev: e86cfcaef246331ee7956dd86c156d594768fe70 Message-Id: <20231216170040.05EC438708FF@sourceware.org> Date: Sat, 16 Dec 2023 17:00:40 +0000 (GMT) List-Id: https://gcc.gnu.org/g:e86cfcaef246331ee7956dd86c156d594768fe70 commit r14-6629-ge86cfcaef246331ee7956dd86c156d594768fe70 Author: Ken Matsui 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 Reviewed-by: Jonathan Wakely 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 + struct is_reference + : public __bool_constant<__is_reference(_Tp)> + { }; +#else template 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 @@ -3250,12 +3257,19 @@ template inline constexpr bool is_class_v = __is_class(_Tp); template inline constexpr bool is_function_v = is_function<_Tp>::value; + +#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_reference) +template + inline constexpr bool is_reference_v = __is_reference(_Tp); +#else template inline constexpr bool is_reference_v = false; template inline constexpr bool is_reference_v<_Tp&> = true; template inline constexpr bool is_reference_v<_Tp&&> = true; +#endif + template inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; template