From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Jonathan Nieder <jrnieder@gmail.com>
Cc: git@vger.kernel.org, Jeff Epler <jepler@unpythonic.net>
Subject: Re: [PATCH/RFC 0/5] Add internationalization support to Git
Date: Mon, 31 May 2010 12:17:11 +0000 [thread overview]
Message-ID: <AANLkTinDqGaqlTJs91vB8giQGo6GfEmCdX3wpNX7lMCR@mail.gmail.com> (raw)
In-Reply-To: <20100530222347.GB477@progeny.tock>
On Sun, May 30, 2010 at 22:23, Jonathan Nieder <jrnieder@gmail.com> wrote:
> [...]
> It would seem that __attribute__((__pure__)) should let the compiler give
> us the best of both worlds, but no luck. Even __attribute__((__const__))
> is ignored; the compiler inlines the body of _() before it has a chance
> to notice.
>
> We can fool the compiler into paying attention by making it not
> inlinable: if gettext.h contains
>
> | extern char *_(const char *s) __attribute__((__format_arg__(1), __const__));
>
> and a separate gettext.c contains
>
> | #include <libintl.h>
> | #include "gettext.h"
> | char *_(const char *s) { return gettext(s); }
>
> we get the performance of B again:
>
> 1.36user 0.01system 0:01.38elapsed 98%CPU (0avgtext+0avgdata 2304maxresident)k
> 0inputs+0outputs (0major+180minor)pagefaults 0swaps
>
> This amounts to lying to the compiler, since it is possible for the string
> pointed to by a single address s to differ between calls to _. The __pure__
> attribute would be more honest, but for reasons I don’t understand it
> suppresses the optimization.
>
> Moral of the story: at least in simple cases, we can keep the performance
> and the typechecking. Phew.
Awesome, how portable is this? If it's just GCC I guess it can just be
wrapped in #ifdef __GNUC__.
Thanks for investingating this.
next prev parent reply other threads:[~2010-05-31 12:17 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-29 22:45 [PATCH/RFC 0/5] Add internationalization support to Git Ævar Arnfjörð Bjarmason
2010-05-29 22:45 ` [PATCH 1/5] Add infrastructure for translating Git with gettext Ævar Arnfjörð Bjarmason
2010-05-29 22:45 ` [PATCH 2/5] gitignore: Ignore files generated by gettext Ævar Arnfjörð Bjarmason
2010-05-29 22:45 ` [PATCH 3/5] Makefile: Remove Gettext files on make clean Ævar Arnfjörð Bjarmason
2010-05-29 22:45 ` [PATCH 4/5] gettext: Add a skeleton po/is.po Ævar Arnfjörð Bjarmason
2010-05-29 22:45 ` [PATCH 5/5] Add infrastructure to make shellscripts translatable Ævar Arnfjörð Bjarmason
2010-05-30 1:46 ` [PATCH/RFC 0/5] Add internationalization support to Git Jonathan Nieder
2010-05-30 16:04 ` Ævar Arnfjörð Bjarmason
2010-05-30 22:23 ` Jonathan Nieder
2010-05-31 12:17 ` Ævar Arnfjörð Bjarmason [this message]
2010-05-30 20:54 ` [PATCH/RFC v2 0/6] " Ævar Arnfjörð Bjarmason
2010-05-30 20:54 ` [PATCH/RFC v2 1/6] Add infrastructure for translating Git with gettext Ævar Arnfjörð Bjarmason
2010-06-01 17:01 ` Jakub Narebski
2010-06-01 18:11 ` [PATCH/RCF] autoconf: Check if <libintl.h> exists and set NO_GETTEXT Ævar Arnfjörð Bjarmason
2010-06-01 21:22 ` Jakub Narebski
2010-05-30 20:54 ` [PATCH/RFC v2 2/6] gitignore: Ignore files generated by gettext Ævar Arnfjörð Bjarmason
2010-05-30 20:54 ` [PATCH/RFC v2 3/6] Makefile: Remove Gettext files on make clean Ævar Arnfjörð Bjarmason
2010-05-30 20:54 ` [PATCH/RFC v2 4/6] gettext: Add a Gettext interface for shell scripts Ævar Arnfjörð Bjarmason
2010-05-30 20:54 ` [PATCH/RFC v2 5/6] gettext: Add a Gettext interface for Perl Ævar Arnfjörð Bjarmason
2010-06-01 17:00 ` Jakub Narebski
2010-06-01 19:06 ` Ævar Arnfjörð Bjarmason
2010-06-02 11:47 ` Jakub Narebski
2010-05-30 20:54 ` [PATCH/RFC v2 6/6] gettext: Add a skeleton po/is.po Ævar Arnfjörð Bjarmason
2010-05-30 21:29 ` Jonathan Nieder
2010-05-30 21:39 ` Jonathan Nieder
2010-05-31 14:17 ` Ævar Arnfjörð Bjarmason
2010-06-01 23:39 ` [PATCH/RFC v3 0/7] Add internationalization support to Git Ævar Arnfjörð Bjarmason
2010-06-02 0:11 ` Ævar Arnfjörð Bjarmason
2010-06-02 1:05 ` [PATCH/RFC v4 " Ævar Arnfjörð Bjarmason
2010-06-02 1:05 ` [PATCH/RFC v4 1/7] Add infrastructure for translating Git with gettext Ævar Arnfjörð Bjarmason
2010-06-02 9:12 ` Peter Krefting
2010-06-02 9:29 ` Ævar Arnfjörð Bjarmason
2010-06-02 10:11 ` Peter Krefting
2010-06-02 10:56 ` Ævar Arnfjörð Bjarmason
2010-06-02 11:31 ` Peter Krefting
2010-06-02 1:05 ` [PATCH/RFC v4 2/7] gettext: Add a Gettext interface for shell scripts Ævar Arnfjörð Bjarmason
2010-06-02 1:06 ` [PATCH/RFC v4 3/7] gettext: Add a Gettext interface for Perl Ævar Arnfjörð Bjarmason
2010-06-02 1:06 ` [PATCH/RFC v4 4/7] Makefile: Don't install Gettext .mo files if NO_GETTEXT Ævar Arnfjörð Bjarmason
2010-06-02 1:06 ` [PATCH/RFC v4 5/7] Makefile: Override --keyword= for all languages Ævar Arnfjörð Bjarmason
2010-06-02 1:06 ` [PATCH/RFC v4 6/7] gettext: Sanity tests for Git's Gettext support Ævar Arnfjörð Bjarmason
2010-06-02 1:06 ` [PATCH/RFC v4 7/7] gettext: Add a skeleton po/is.po Ævar Arnfjörð Bjarmason
2010-06-02 6:32 ` [PATCH/RFC v3 0/7] Add internationalization support to Git Johannes Sixt
2010-06-02 22:33 ` [PATCH/RFC v5 0/2] Add infrastructure for translating Git with gettext Ævar Arnfjörð Bjarmason
2010-06-02 22:33 ` [PATCH/RFC v5 1/2] " Ævar Arnfjörð Bjarmason
2010-06-02 22:33 ` [PATCH/RFC v5 2/2] Add initial C, Shell and Perl gettext translations Ævar Arnfjörð Bjarmason
2010-06-01 23:39 ` [PATCH/RFC v3 1/7] Add infrastructure for translating Git with gettext Ævar Arnfjörð Bjarmason
2010-06-01 23:39 ` [PATCH/RFC v3 2/7] gettext: Add a Gettext interface for shell scripts Ævar Arnfjörð Bjarmason
2010-06-02 6:32 ` Johannes Sixt
2010-06-02 8:53 ` Ævar Arnfjörð Bjarmason
2010-06-02 9:38 ` Johannes Sixt
2010-06-01 23:39 ` [PATCH/RFC v3 3/7] gettext: Add a Gettext interface for Perl Ævar Arnfjörð Bjarmason
2010-06-01 23:39 ` [PATCH/RFC v3 4/7] Makefile: Don't install Gettext .mo files if NO_GETTEXT Ævar Arnfjörð Bjarmason
2010-06-01 23:39 ` [PATCH/RFC v3 5/7] Makefile: Override --keyword= for all languages Ævar Arnfjörð Bjarmason
2010-06-01 23:39 ` [PATCH/RFC v3 6/7] gettext: Basic sanity tests for Git's Gettext support Ævar Arnfjörð Bjarmason
2010-06-02 6:32 ` Johannes Sixt
2010-06-01 23:39 ` [PATCH/RFC v3 7/7] gettext: Add a skeleton po/is.po Ævar Arnfjörð Bjarmason
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