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From: "juchem at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/62274] New: [C++11] Variadic templates expansion into non-variadic class template Date: Tue, 26 Aug 2014 23:03:00 -0000 [thread overview] Message-ID: <bug-62274-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62274 Bug ID: 62274 Summary: [C++11] Variadic templates expansion into non-variadic class template Product: gcc Version: 4.9.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: juchem at gmail dot com The code below won't compile for gcc 4.9.0, 4.8.1 and 4.7.3. Tested in Debian sid (aug/2014), http://gcc.godbolt.org/ and http://ideone.com. #include <type_traits> using namespace std; struct bar { typedef double foo; }; template <typename T> using get_foo = typename T::foo; template <template <typename...> class T> struct baz { template <typename... UArgs> using type = T<UArgs...>; }; int main() { return !std::is_same<double, baz<get_foo>::type<bar>>::value; } error output: prog.cpp: In substitution of ‘template<class T> using get_foo = typename T::foo [with T = UArgs ...]’: prog.cpp:13:26: required from ‘struct baz<get_foo>’ prog.cpp:17:49: required from here prog.cpp:8:32: error: ‘UArgs ...’ is not a class, struct, or union type using get_foo = typename T::foo; ^ prog.cpp: In function ‘int main()’: prog.cpp:17:59: error: template argument 2 is invalid static_assert(std::is_same<double, baz<get_foo>::type<bar>>::value, "mismatch"); >From gcc-bugs-return-459316-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 26 23:07:34 2014 Return-Path: <gcc-bugs-return-459316-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org> Delivered-To: listarch-gcc-bugs@gcc.gnu.org Received: (qmail 17161 invoked by alias); 26 Aug 2014 23:07:34 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: <gcc-bugs.gcc.gnu.org> List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/> List-Post: <mailto:gcc-bugs@gcc.gnu.org> List-Help: <mailto:gcc-bugs-help@gcc.gnu.org> Sender: gcc-bugs-owner@gcc.gnu.org Delivered-To: mailing list gcc-bugs@gcc.gnu.org Received: (qmail 17126 invoked by uid 48); 26 Aug 2014 23:07:30 -0000 From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/62262] aarch64 gcc generates invalid assembler Date: Tue, 26 Aug 2014 23:07:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 5.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: <bug-62262-4-K5eOX949Y4@http.gcc.gnu.org/bugzilla/> In-Reply-To: <bug-62262-4@http.gcc.gnu.org/bugzilla/> References: <bug-62262-4@http.gcc.gnu.org/bugzilla/> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2014-08/txt/msg01813.txt.bz2 Content-length: 499 https://gcc.gnu.org/bugzilla/show_bug.cgi?idb262 --- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Carrot from comment #5) > Actually the original source code is guarded by assert, and the parameter > passed to CLZ can be guaranteed not 0, so "value <<= zeros" is well defined > in our original source code. The issue is the second CLZ (not the first one). Though if I read the code correctly value<<1 can never be zero but GCC does not optimize away that check.
next reply other threads:[~2014-08-26 23:03 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-08-26 23:03 juchem at gmail dot com [this message] 2014-12-14 0:04 ` [Bug c++/62274] " ville.voutilainen at gmail dot com 2015-03-05 7:26 ` juchem at gmail dot com 2015-03-05 7:50 ` ville.voutilainen at gmail dot com 2015-03-05 10:48 ` redi at gcc dot gnu.org 2021-08-02 2:21 ` pinskia at gcc dot gnu.org 2021-08-02 3:59 ` ville.voutilainen at gmail dot com
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