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Date: Thu, 17 Apr 2008 02:45:21 -0700 (PDT)
From: "Farid Zaripov (JIRA)" <jira@apache.org>
To: issues@stdcxx.apache.org
Subject: [jira] Commented: (STDCXX-687) [gcc] use string __builtins
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    [ https://issues.apache.org/jira/browse/STDCXX-687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12589909#action_12589909 ] 

Farid Zaripov commented on STDCXX-687:
--------------------------------------

Merged in 4.2.x branch thus: http://svn.apache.org/viewvc?view=rev&revision=648752

> [gcc] use string __builtins
> ---------------------------
>
>                 Key: STDCXX-687
>                 URL: https://issues.apache.org/jira/browse/STDCXX-687
>             Project: C++ Standard Library
>          Issue Type: Sub-task
>          Components: 21. Strings
>    Affects Versions: 4.1.2, 4.1.3, 4.1.4, 4.2.0
>            Reporter: Martin Sebor
>            Assignee: Martin Sebor
>             Fix For: 4.2.1
>
>   Original Estimate: 2h
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> The following gcc builtin equivalents of the C string functions would be useful in the implementation of std::char_traits:
> __builtin_memcpy: char_traits::copy()
> __builtin_memcmp: char_traits::compare()
> __builtin_memmove: char_traits::move()
> __builtin_memset: char_traits::assign()
> __builtin_strlen: char_traits::length()
> Unfortunately, as of gcc 4.2.2, there is no builtin equivalent of memchr() which is used in char_traits::find(), so using the builtins won't let us get away from #including the <cstring> header to bring in the declaration of the function (thus reducing namespace pollution caused by all the other symbols declared in the header).
> There also are no builtins for the wide character counterparts of any of these functions (such as wmemcmp or wcslen).
> See the following page for more details:
> http://gcc.gnu.org/onlinedocs/gcc-4.2.2/gcc/Other-Builtins.html#Other-Builtins

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