[{"id":3677205,"web_url":"http://patchwork.ozlabs.org/comment/3677205/","msgid":"","list_archive_url":null,"date":"2026-04-14T13:29:04","subject":"Re: [PATCH] libstdc++: Implement LWG4403: CTAD misses difference type\n casting","submitter":{"id":48004,"url":"http://patchwork.ozlabs.org/api/people/48004/","name":"Jonathan Wakely","email":"jwakely@redhat.com"},"content":"On Tue, 14 Apr 2026 at 14:02, Matthias Kretz wrote:\n>\n> From: Matthias Kretz \n>\n> libstdc++-v3/ChangeLog:\n>\n> * include/bits/simd_vec.h (basic_vec deduction guide): Explicit\n> cast to simd-size-type from range size type.\n\nOK, thanks\n\n>\n> Signed-off-by: Matthias Kretz \n> ---\n> libstdc++-v3/include/bits/simd_vec.h | 4 ++--\n> 1 file changed, 2 insertions(+), 2 deletions(-)\n>\n> diff --git a/libstdc++-v3/include/bits/simd_vec.h b/libstdc++-v3/include/bits/\n> simd_vec.h\n> index da194824e72..2574bf7c3ad 100644\n> --- a/libstdc++-v3/include/bits/simd_vec.h\n> +++ b/libstdc++-v3/include/bits/simd_vec.h\n> @@ -2264,9 +2264,9 @@ basic_vec(_Rg&& __range, flags<_Flags...> __flags = {})\n> -> basic_vec,\n> __deduce_abi_t,\n> #if 0 // PR117849\n> - ranges::size(__r)>>;\n> +\n> static_cast<__simd_size_type>(ranges::size(__r))>>;\n> #else\n> - decltype(std::span(__r))::extent>>;\n> +\n> static_cast<__simd_size_type>(decltype(std::span(__r))::extent)>>;\n> #endif\n>\n> template \n> --\n> ──────────────────────────────────────────────────────────────────────────\n> Dr. Matthias Kretz https://mattkretz.github.io\n> GSI Helmholtz Center for Heavy Ion Research https://gsi.de\n> std::simd\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=SOdtPvNc;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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Tue, 14 Apr 2026\n 07:28:05 -0700 (PDT)","MIME-Version":"1.0","References":"<11297690.CDJkKcVGEf@vir-laptop>","In-Reply-To":"<11297690.CDJkKcVGEf@vir-laptop>","From":"Hewill Kang ","Date":"Tue, 14 Apr 2026 22:27:53 +0800","X-Gm-Features":"AQROBzA1C27PTS2zArNgzkmEFmORmwHMScUigvs48xWT78caWNtMfCPpRwzhibw","Message-ID":"\n ","Subject":"Re: [PATCH] libstdc++: Implement LWG4403: CTAD misses difference type\n casting","To":"Matthias Kretz ","Cc":"libstdc++@gcc.gnu.org, gcc-patches@gcc.gnu.org","Content-Type":"multipart/alternative; boundary=\"00000000000054727f064f6c6803\"","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":3677307,"web_url":"http://patchwork.ozlabs.org/comment/3677307/","msgid":"<10403547.NyiUUSuA9g@vir-laptop>","list_archive_url":null,"date":"2026-04-14T16:29:04","subject":"Re: [PATCH] libstdc++: Implement LWG4403: CTAD misses difference type\n casting","submitter":{"id":92625,"url":"http://patchwork.ozlabs.org/api/people/92625/","name":"Matthias Kretz","email":"MatthiasKretz@gmx.net"},"content":"Hewill Kang [Tuesday, 14 April 2026, 16:27:53 CEST]:\n> LGTM.\n> But your __static_sized_range already blocks integer-class types, so this\n> doesn't make any real difference, does it?\n\nIt turns an implicit size_t -> int conversion into an explicit conversion. \nStill, even with -Wconversion -Wsign-conversion -Wsystem-headers, I don't \nthink could ever have been an issue. It simply makes the code match the spec \nmore closely -> less mental load when reviewing the code against the standard.\n\nAlso, __static_sized_range wasn't a conscious choice. integer-class types \nsimply aren't part of my mental model (yet) and I've yet to get practical \nexperience ...\n\n- Matthias\n\n> \n> Matthias Kretz 於 2026年4月14日週二 下午9:02寫道：\n> \n> \n> > From: Matthias Kretz \n> >\n> >\n> >\n> > libstdc++-v3/ChangeLog:\n> >\n> >\n> >\n> > * include/bits/simd_vec.h (basic_vec deduction guide): Explicit\n> > cast to simd-size-type from range size type.\n> >\n> >\n> >\n> > Signed-off-by: Matthias Kretz \n> > ---\n> > \n> > libstdc++-v3/include/bits/simd_vec.h | 4 ++--\n> > 1 file changed, 2 insertions(+), 2 deletions(-)\n> >\n> >\n> >\n> > diff --git a/libstdc++-v3/include/bits/simd_vec.h\n> > b/libstdc++-v3/include/bits/\n> > simd_vec.h\n> > index da194824e72..2574bf7c3ad 100644\n> > --- a/libstdc++-v3/include/bits/simd_vec.h\n> > +++ b/libstdc++-v3/include/bits/simd_vec.h\n> > @@ -2264,9 +2264,9 @@ basic_vec(_Rg&& __range, flags<_Flags...> __flags =\n> > {})\n> > \n> > -> basic_vec,\n> > \n> > __deduce_abi_t,\n> > \n> > #if 0 // PR117849\n> > \n> > - ranges::size(__r)>>;\n> > +\n> > static_cast<__simd_size_type>(ranges::size(__r))>>;\n> > \n> > #else\n> > \n> > - decltype(std::span(__r))::extent>>;\n> > +\n> > static_cast<__simd_size_type>(decltype(std::span(__r))::extent)>>;\n> > \n> > #endif\n> >\n> >\n> >\n> > template \n> > \n> > --\n> > ──────────────────────────────────────────────────────────────────────────\n> > \n> > \n> > Dr. Matthias Kretz https://mattkretz.github.io\n> > GSI Helmholtz Center for Heavy Ion Research https://gsi.de\n> > std::simd\n> > \n> > ──────────────────────────────────────────────────────────────────────────\n> > \n> >\n> >\n> 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