[{"id":3680572,"web_url":"http://patchwork.ozlabs.org/comment/3680572/","msgid":"","list_archive_url":null,"date":"2026-04-22T11:46:11","subject":"Re: [PATCH] libstdc++: Mandate power of two alignment for\n std::is_sufficiently_aligned.","submitter":{"id":48004,"url":"http://patchwork.ozlabs.org/api/people/48004/","name":"Jonathan Wakely","email":"jwakely@redhat.com"},"content":"On Wed, 22 Apr 2026 at 12:39, Tomasz Kamiński wrote:\n>\n> This implements LWG4290. Missing Mandates clauses on is_sufficiently_aligned.\n>\n> libstdc++-v3/ChangeLog:\n>\n> * include/bits/align.h (is_sufficiently_aligned): Mandate\n> that _Align is power of two.\n> * testsuite/std/time/format/simple.cc: New test.\n\nDid you 'git add' the wrong test?\n\n> ---\n> No adding resolve issue comment, as this is C++26 feature.\n>\n> Tested on x86_64-linux. OK for trunk?\n>\n> libstdc++-v3/include/bits/align.h | 5 ++++-\n> libstdc++-v3/testsuite/std/time/format/simple.cc | 11 +++++++++++\n> 2 files changed, 15 insertions(+), 1 deletion(-)\n> create mode 100644 libstdc++-v3/testsuite/std/time/format/simple.cc\n>\n> diff --git a/libstdc++-v3/include/bits/align.h b/libstdc++-v3/include/bits/align.h\n> index 1a14e282216..3c8355d0e07 100644\n> --- a/libstdc++-v3/include/bits/align.h\n> +++ b/libstdc++-v3/include/bits/align.h\n> @@ -116,7 +116,10 @@ align(size_t __align, size_t __size, void*& __ptr, size_t& __space) noexcept\n> [[nodiscard,__gnu__::__always_inline__]]\n> inline bool\n> is_sufficiently_aligned(_Tp* __ptr)\n> - { return reinterpret_cast<__UINTPTR_TYPE__>(__ptr) % _Align == 0; }\n> + {\n> + static_assert(std::has_single_bit(_Align));\n> + return reinterpret_cast<__UINTPTR_TYPE__>(__ptr) % _Align == 0;\n> + }\n> #endif // __glibcxx_is_sufficiently_aligned\n>\n> _GLIBCXX_END_NAMESPACE_VERSION\n> diff --git a/libstdc++-v3/testsuite/std/time/format/simple.cc b/libstdc++-v3/testsuite/std/time/format/simple.cc\n> new file mode 100644\n> index 00000000000..db25a460bf7\n> --- /dev/null\n> +++ b/libstdc++-v3/testsuite/std/time/format/simple.cc\n> @@ -0,0 +1,11 @@\n> +// { dg-do run { target c++20 } }\n> +// { dg-timeout-factor 2 }\n> +\n> +#include \n> +#include \n> +#include \n> +\n> +int main()\n> +{\n> + auto s = std::format(\"{:%F %T}\", std::chrono::system_clock::now());\n> +}\n> --\n> 2.53.0\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=KFJVrCWb;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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Wed, 22 Apr 2026\n 04:46:27 -0700 (PDT)"],"MIME-Version":"1.0","References":"<20260422113908.795344-1-tkaminsk@redhat.com>","In-Reply-To":"<20260422113908.795344-1-tkaminsk@redhat.com>","From":"Jonathan Wakely ","Date":"Wed, 22 Apr 2026 12:46:11 +0100","X-Gm-Features":"AQROBzDV1XY1zCYtHmNHwasRfdV6_LFNEw82sl8L-M5eJc-xsHJwiRgDXcoVlew","Message-ID":"\n ","Subject":"Re: [PATCH] libstdc++: Mandate power of two alignment for\n std::is_sufficiently_aligned.","To":"=?utf-8?q?Tomasz_Kami=C5=84ski?= ","Cc":"libstdc++@gcc.gnu.org, gcc-patches@gcc.gnu.org","X-Mimecast-Spam-Score":"0","X-Mimecast-MFC-PROC-ID":"0N2D8gIQWD0QWHQn_KRVMsbGzsM2w6fVb8CEuG2PPjM_1776858388","X-Mimecast-Originator":"redhat.com","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3680573,"web_url":"http://patchwork.ozlabs.org/comment/3680573/","msgid":"","list_archive_url":null,"date":"2026-04-22T11:49:44","subject":"Re: [PATCH] libstdc++: Mandate power of two alignment for\n std::is_sufficiently_aligned.","submitter":{"id":90409,"url":"http://patchwork.ozlabs.org/api/people/90409/","name":"Tomasz Kamiński","email":"tkaminsk@redhat.com"},"content":"On Wed, Apr 22, 2026 at 1:46 PM Jonathan Wakely wrote:\n\n> On Wed, 22 Apr 2026 at 12:39, Tomasz Kamiński wrote:\n> >\n> > This implements LWG4290. Missing Mandates clauses on\n> is_sufficiently_aligned.\n> >\n> > libstdc++-v3/ChangeLog:\n> >\n> > * include/bits/align.h (is_sufficiently_aligned): Mandate\n> > that _Align is power of two.\n> > * testsuite/std/time/format/simple.cc: New test.\n>\n> Did you 'git add' the wrong test?\n>\nYes, will post v2 soon.\n\n>\n> > ---\n> > No adding resolve issue comment, as this is C++26 feature.\n> >\n> > Tested on x86_64-linux. OK for trunk?\n> >\n> > libstdc++-v3/include/bits/align.h | 5 ++++-\n> > libstdc++-v3/testsuite/std/time/format/simple.cc | 11 +++++++++++\n> > 2 files changed, 15 insertions(+), 1 deletion(-)\n> > create mode 100644 libstdc++-v3/testsuite/std/time/format/simple.cc\n> >\n> > diff --git a/libstdc++-v3/include/bits/align.h\n> b/libstdc++-v3/include/bits/align.h\n> > index 1a14e282216..3c8355d0e07 100644\n> > --- a/libstdc++-v3/include/bits/align.h\n> > +++ b/libstdc++-v3/include/bits/align.h\n> > @@ -116,7 +116,10 @@ align(size_t __align, size_t __size, void*& __ptr,\n> size_t& __space) noexcept\n> > [[nodiscard,__gnu__::__always_inline__]]\n> > inline bool\n> > is_sufficiently_aligned(_Tp* __ptr)\n> > - { return reinterpret_cast<__UINTPTR_TYPE__>(__ptr) % _Align == 0; }\n> > + {\n> > + static_assert(std::has_single_bit(_Align));\n> > + return reinterpret_cast<__UINTPTR_TYPE__>(__ptr) % _Align == 0;\n> > + }\n> > #endif // __glibcxx_is_sufficiently_aligned\n> >\n> > _GLIBCXX_END_NAMESPACE_VERSION\n> > diff --git a/libstdc++-v3/testsuite/std/time/format/simple.cc\n> b/libstdc++-v3/testsuite/std/time/format/simple.cc\n> > new file mode 100644\n> > index 00000000000..db25a460bf7\n> > --- /dev/null\n> > +++ b/libstdc++-v3/testsuite/std/time/format/simple.cc\n> > @@ -0,0 +1,11 @@\n> > +// { dg-do run { target c++20 } }\n> > +// { dg-timeout-factor 2 }\n> > +\n> > +#include \n> > +#include \n> > +#include \n> > +\n> > +int main()\n> > +{\n> > + auto s = std::format(\"{:%F %T}\", std::chrono::system_clock::now());\n> > +}\n> > --\n> > 2.53.0\n> >\n>\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=SVihqr3b;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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