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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/105329] [12/13 Regression] Bogus restrict warning when assigning 1-char string literal to std::string since r12-3347-g8af8abfbbace49e6
Date: Mon, 02 May 2022 19:43:39 +0000 [thread overview]
Message-ID: <bug-105329-4-8SpJ4hZW1e@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-105329-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105329
--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #11)
> Maybe
>
> _GLIBCXX20_CONSTEXPR
> basic_string&
> assign(const _CharT* __s)
> {
> __glibcxx_requires_string(__s);
> return _M_replace(size_type(0), this->size(), __s,
> traits_type::length(__s));
> }
>
> isn't the most efficient way to assign a string (constant) looking at
For string constant sure, but unless we know that __s points to a string
literal, we need to do those overlap checks I'm afraid.
Or is something like:
void g (std::string& s)
{
s = s.c_str() + 16;
}
invalid if s is before known to contain a string longer than 16 chars?
next prev parent reply other threads:[~2022-05-02 19:43 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-21 7:41 [Bug c++/105329] New: Bogus restrict warning when assigning 1-char string literal to std::string boris at kolpackov dot net
2022-04-21 11:15 ` [Bug tree-optimization/105329] " rguenth at gcc dot gnu.org
2022-04-21 20:50 ` amacleod at redhat dot com
2022-04-21 22:51 ` amacleod at redhat dot com
2022-04-22 10:31 ` aldyh at gcc dot gnu.org
2022-04-25 17:50 ` amacleod at redhat dot com
2022-04-25 22:25 ` mattias.ellert at physics dot uu.se
2022-04-26 15:04 ` [Bug tree-optimization/105329] [12 Regression] Bogus restrict warning when assigning 1-char string literal to std::string since r12-3347-g8af8abfbbace49e6 marxin at gcc dot gnu.org
2022-05-02 12:44 ` [Bug tree-optimization/105329] [12/13 " rguenth at gcc dot gnu.org
2022-05-02 12:45 ` rguenth at gcc dot gnu.org
2022-05-02 12:46 ` rguenth at gcc dot gnu.org
2022-05-02 12:57 ` rguenth at gcc dot gnu.org
2022-05-02 13:22 ` rguenth at gcc dot gnu.org
2022-05-02 13:33 ` jakub at gcc dot gnu.org
2022-05-02 13:58 ` jakub at gcc dot gnu.org
2022-05-02 16:04 ` jakub at gcc dot gnu.org
2022-05-02 19:43 ` jakub at gcc dot gnu.org [this message]
2022-05-02 22:08 ` redi at gcc dot gnu.org
2022-05-06 3:59 ` mattias.ellert at physics dot uu.se
2022-05-06 8:33 ` jakub at gcc dot gnu.org
2022-05-20 8:13 ` rguenth at gcc dot gnu.org
2022-07-26 12:05 ` jakub at gcc dot gnu.org
2022-09-12 9:37 ` cvs-commit at gcc dot gnu.org
2022-09-29 15:19 ` msebor at gcc dot gnu.org
2022-09-30 16:55 ` dan at stahlke dot org
2022-09-30 17:16 ` dan at stahlke dot org
2023-02-21 18:30 ` 49tbwddbqeazdawz at chyen dot cc
2023-02-21 19:28 ` redi at gcc dot gnu.org
2023-02-22 17:28 ` 49tbwddbqeazdawz at chyen dot cc
2023-02-22 17:52 ` redi at gcc dot gnu.org
2023-02-24 14:10 ` wielkiegie at gmail dot com
2023-05-08 12:24 ` [Bug tree-optimization/105329] [12/13/14 " rguenth at gcc dot gnu.org
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