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Wed, 12 Jul 2023 19:56:46 -0700 (PDT) MIME-Version: 1.0 References: <20230708051137.63707-1-kmatsui@gcc.gnu.org> <20230713023731.15571-1-kmatsui@gcc.gnu.org> <20230713023731.15571-3-kmatsui@gcc.gnu.org> In-Reply-To: <20230713023731.15571-3-kmatsui@gcc.gnu.org> From: Ken Matsui Date: Wed, 12 Jul 2023 19:56:31 -0700 Message-ID: Subject: Re: [PATCH v10 2/5] libstdc++: Use new built-in trait __is_reference for std::is_reference To: Ken Matsui Cc: gcc-patches@gcc.gnu.org, libstdc++@gcc.gnu.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-10.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,GIT_PATCH_0,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Hi, Here is the benchmark result for is_reference: https://github.com/ken-matsui/gcc-benches/blob/main/is_reference.md#wed-jul= -12-074702-pm-pdt-2023 Time: -8.15593% Peak Memory Usage: -4.48408% Total Memory Usage: -8.03783% Sincerely, Ken Matsui On Wed, Jul 12, 2023 at 7:39=E2=80=AFPM Ken Matsui wr= ote: > > This patch gets std::is_reference to dispatch to new built-in trait > __is_reference. > > libstdc++-v3/ChangeLog: > > * include/std/type_traits (is_reference): Use __is_reference buil= t-in > trait. > (is_reference_v): Likewise. > > Signed-off-by: Ken Matsui > --- > 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 0e7a9c9c7f3..2a14df7e5f9 100644 > --- a/libstdc++-v3/include/std/type_traits > +++ b/libstdc++-v3/include/std/type_traits > @@ -639,6 +639,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION > // Composite type categories. > > /// is_reference > +#if __has_builtin(__is_reference) > + template > + struct is_reference > + : public __bool_constant<__is_reference(_Tp)> > + { }; > +#else > template > struct is_reference > : public false_type > @@ -653,6 +659,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION > struct is_reference<_Tp&&> > : public true_type > { }; > +#endif > > /// is_arithmetic > template > @@ -3192,12 +3199,19 @@ template > inline constexpr bool is_class_v =3D __is_class(_Tp); > template > inline constexpr bool is_function_v =3D is_function<_Tp>::value; > + > +#if __has_builtin(__is_reference) > +template > + inline constexpr bool is_reference_v =3D __is_reference(_Tp); > +#else > template > inline constexpr bool is_reference_v =3D false; > template > inline constexpr bool is_reference_v<_Tp&> =3D true; > template > inline constexpr bool is_reference_v<_Tp&&> =3D true; > +#endif > + > template > inline constexpr bool is_arithmetic_v =3D is_arithmetic<_Tp>::value; > template > -- > 2.41.0 >