From: Gabriel Dos Reis <gdr@integrable-solutions.net>
To: Martin Reinecke <martin@MPA-Garching.MPG.DE>
Cc: gcc@gcc.gnu.org
Subject: Re: std::pow implementation
Date: Wed, 30 Jul 2003 13:53:00 -0000 [thread overview]
Message-ID: <m3el085dz6.fsf@uniton.integrable-solutions.net> (raw)
In-Reply-To: <3F27C5DE.2010604@mpa-garching.mpg.de>
Martin Reinecke <martin@MPA-Garching.MPG.DE> writes:
| Gabriel Dos Reis wrote:
| > Martin Reinecke <martin@MPA-Garching.MPG.DE> writes:
| > | This is certainly a valid point of view, but I think that C++, as
| > it exists
| > | at the moment, just _doesn't give_ the programmer the possibility of specifying
| > | what exactly (s)he wants.
| > But taking out the only lever the programmer currently has is even
| > far
| > worse.
|
| Right, but that's exactly the dilemma with C++'s "implicit" inline:
| if you want the compiler to _be able_ to inline a function, you should put
| it in the class definition.
Please note that there is no "implicit" inline in C++. The only thing
that is present is that function definition within a class declaration
is an inline definition, because that is the orginal syntax before
inlining nonmember function was implemented. A function defined
within a class is as inline as a function defined with the "inline"
keyword outside a class.
| But this implies an "inline" directive
| which would more or less _force_ the compiler to always inline the code.
| So, if inline was as strict as you'd like to see it, there would be no
| way to tell gcc "here's a function that might be probably worthwhile to
| inline". I could only say "inline this" or "don't inline".
|
| This could change if gcc starts to inline functions across translation units,
| but currently it doesn't (I believe).
That "worthwhile inlining" could subject to higher optimiations
("-O3") if it is so that we've reached the level of sophistication
where automatic inline supersedes traditional "inline".
But I see on concrete real world codes that the "inline" meaning
transmutation GCC operates does cause more grief that it does good.
| > | I think it is not generally possible for a programmer to decide
| > | whether a function should be inlined or not (see below).
| > I reckon that there are conner cases that "inline" does not cover.
| > But, I'm worrying about the common situations -- and those that ave
| > been subject of PRs.
|
| I've encountered the example I gave a few times in real-life code,
| but in the frame of standard C++ nothing can be done about it, so
| I cannot file a PR.
|
| > However, in lieu of pragmas, I will point out that current C++
| > gives the programmer means to express, in many corner cases, the
| > intention of not inlining, by combining inline and noninline
| > definitions and object functions.
|
| You're right. It's not too beautiful and makes maintenance a bit harder,
| but on the other hand it shouldn't happen too often.
and is expressed with standard constructs.
-- Gaby
next prev parent reply other threads:[~2003-07-30 13:41 UTC|newest]
Thread overview: 212+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-30 13:13 Martin Reinecke
2003-07-30 13:30 ` Gabriel Dos Reis
2003-07-30 13:40 ` Martin Reinecke
2003-07-30 13:46 ` Andrew Pinski
2003-07-30 13:47 ` Steven Bosscher
2003-07-30 14:32 ` Martin Reinecke
2003-07-30 13:53 ` Gabriel Dos Reis [this message]
2003-07-30 14:14 ` Martin Reinecke
2003-07-30 14:33 ` Gabriel Dos Reis
2003-07-30 15:27 ` Martin Reinecke
2003-07-30 15:42 ` Gabriel Dos Reis
2003-07-30 17:38 ` Martin Reinecke
2003-08-04 12:55 ` Theodore Papadopoulo
2003-08-04 13:11 ` Gabriel Dos Reis
2003-08-04 14:32 ` Theodore Papadopoulo
2003-08-04 14:50 ` Gabriel Dos Reis
2003-08-04 14:58 ` Daniel Berlin
2003-08-04 15:13 ` The Zen of Optimizing C++ - What is the sound of one compiler inlining? Gabriel Dos Reis
2003-07-30 15:56 ` std::pow implementation Scott Robert Ladd
2003-07-30 16:16 ` Steven Bosscher
2003-07-30 16:47 ` Scott Robert Ladd
-- strict thread matches above, loose matches on Subject: below --
2003-08-04 22:57 Robert Dewar
2003-08-04 18:42 Robert Dewar
2003-08-04 18:46 ` Gabriel Dos Reis
2003-08-04 18:22 Robert Dewar
2003-08-04 18:29 ` Gabriel Dos Reis
2003-08-04 18:21 Robert Dewar
2003-08-04 18:08 Robert Dewar
2003-08-04 18:17 ` Gabriel Dos Reis
2003-08-04 17:48 Robert Dewar
2003-08-04 17:57 ` Gabriel Dos Reis
2003-08-04 18:14 ` Joe Buck
2003-08-04 17:43 Robert Dewar
2003-08-04 17:53 ` Gabriel Dos Reis
2003-08-04 17:33 Robert Dewar
2003-08-04 17:36 ` Joe Buck
2003-08-04 17:38 ` Gabriel Dos Reis
2003-08-04 22:28 ` Mark Hahn
2003-08-04 22:49 ` tm_gccmail
2003-08-04 17:03 Robert Dewar
2003-08-04 17:23 ` Joe Buck
2003-08-04 18:05 ` Richard Earnshaw
2003-08-04 18:15 ` Gabriel Dos Reis
2003-08-04 19:00 ` Bernd Schmidt
2003-08-04 19:12 ` Richard Guenther
2003-07-31 12:05 Robert Dewar
2003-07-31 13:00 ` Gabriel Dos Reis
2003-07-31 11:50 Robert Dewar
2003-07-31 10:54 Richard Guenther
2003-07-31 11:08 ` Gabriel Dos Reis
2003-07-31 11:31 ` Rob Taylor
2003-07-31 14:13 ` Scott Robert Ladd
2003-07-31 14:44 ` Gabriel Dos Reis
2003-07-31 17:24 ` Steven Bosscher
2003-07-31 18:45 ` Scott Robert Ladd
2003-07-31 10:19 Martin Reinecke
2003-07-31 10:38 ` Gabriel Dos Reis
2003-07-30 22:49 Robert Dewar
2003-07-30 22:28 Robert Dewar
2003-07-30 21:49 Robert Dewar
2003-07-30 16:36 Robert Dewar
2003-07-30 16:49 ` Gabriel Dos Reis
2003-07-30 16:55 ` Scott Robert Ladd
2003-07-30 19:21 ` Felix Lee
2003-07-30 16:08 Robert Dewar
2003-07-30 16:06 Richard Guenther
2003-07-30 16:37 ` Martin Reinecke
2003-07-30 14:25 Robert Dewar
2003-07-30 14:49 ` Gabriel Dos Reis
2003-07-30 14:21 Robert Dewar
2003-07-30 14:44 ` Gabriel Dos Reis
2003-07-30 14:51 ` Paolo Carlini
2003-07-30 16:59 ` Joe Buck
2003-07-30 17:35 ` Richard Earnshaw
2003-07-30 14:18 Robert Dewar
2003-07-30 14:31 ` Richard Earnshaw
2003-07-30 14:36 ` Richard Guenther
2003-07-30 14:11 Robert Dewar
2003-07-30 14:29 ` Richard Guenther
2003-07-30 14:05 Robert Dewar
2003-07-30 14:14 ` Gabriel Dos Reis
2003-07-30 14:04 Robert Dewar
2003-07-30 14:10 ` Gabriel Dos Reis
2003-07-30 13:56 Robert Dewar
2003-07-30 14:04 ` Richard Guenther
2003-07-30 14:08 ` Gabriel Dos Reis
2003-07-31 2:10 ` Alexandre Oliva
2003-07-31 2:46 ` Gabriel Dos Reis
2003-07-31 6:49 ` Alexandre Oliva
2003-07-31 7:58 ` Gabriel Dos Reis
2003-07-31 8:14 ` Gabriel Dos Reis
2003-07-30 13:52 Robert Dewar
2003-07-30 14:02 ` Richard Guenther
2003-07-30 13:25 Robert Dewar
2003-07-30 12:55 Stephan T. Lavavej
2003-07-30 12:59 ` Gabriel Dos Reis
2003-07-29 11:57 Richard Guenther
2003-07-29 12:10 ` Gabriel Dos Reis
2003-07-29 12:10 ` Richard Guenther
2003-07-29 12:14 ` Gabriel Dos Reis
2003-07-29 12:25 ` Richard Guenther
2003-07-29 12:38 ` Gabriel Dos Reis
2003-07-29 12:44 ` Richard Guenther
2003-07-29 12:49 ` Gabriel Dos Reis
2003-07-30 5:18 ` Alexandre Oliva
2003-07-30 5:26 ` Gabriel Dos Reis
2003-07-30 6:57 ` Alexandre Oliva
2003-07-30 10:11 ` Gabriel Dos Reis
2003-07-30 11:58 ` Richard Earnshaw
2003-07-30 12:11 ` Gabriel Dos Reis
2003-07-30 12:13 ` Steven Bosscher
2003-07-30 12:23 ` Gabriel Dos Reis
2003-07-30 12:31 ` Steven Bosscher
2003-07-30 12:47 ` Gabriel Dos Reis
2003-07-30 13:06 ` Steven Bosscher
2003-07-30 13:22 ` Gabriel Dos Reis
2003-07-30 12:42 ` Richard Guenther
2003-07-30 12:46 ` Gabriel Dos Reis
2003-07-30 13:01 ` Richard Guenther
2003-07-30 13:26 ` Steven Bosscher
2003-07-30 13:38 ` Richard Guenther
2003-07-30 13:49 ` Gabriel Dos Reis
2003-07-30 13:19 ` Karel Gardas
2003-07-30 13:24 ` Gabriel Dos Reis
2003-07-30 13:41 ` Richard Earnshaw
2003-07-30 13:51 ` Gabriel Dos Reis
2003-07-30 13:51 ` Richard Earnshaw
2003-07-30 13:59 ` Gabriel Dos Reis
2003-07-30 14:08 ` Richard Guenther
2003-07-30 14:19 ` Richard Guenther
2003-07-30 14:24 ` Gabriel Dos Reis
2003-07-30 14:48 ` Richard Guenther
2003-07-30 14:55 ` Gabriel Dos Reis
2003-07-30 15:29 ` Richard Guenther
2003-07-31 0:30 ` Richard B. Kreckel
2003-07-30 14:11 ` Richard Earnshaw
2003-07-30 14:26 ` Gabriel Dos Reis
2003-07-30 16:25 ` Scott Robert Ladd
2003-07-30 13:59 ` Richard Guenther
2003-07-30 14:01 ` Gabriel Dos Reis
2003-07-30 15:45 ` Scott Robert Ladd
2003-07-30 16:50 ` Richard Earnshaw
2003-07-30 16:57 ` Gabriel Dos Reis
2003-07-30 17:42 ` Richard Earnshaw
2003-07-30 18:06 ` Gabriel Dos Reis
2003-07-30 17:02 ` Scott Robert Ladd
2003-07-30 19:31 ` tm_gccmail
2003-07-30 17:32 ` Joe Buck
2003-07-29 12:53 ` Steven Bosscher
2003-07-29 12:53 ` Gabriel Dos Reis
2003-07-29 12:58 ` Richard Guenther
2003-07-29 12:59 ` Steven Bosscher
2003-07-29 13:05 ` Paolo Carlini
2003-07-29 13:22 ` Richard Guenther
2003-07-29 13:36 ` Steven Bosscher
2003-07-29 14:14 ` Richard Guenther
2003-07-29 14:22 ` Richard Guenther
2003-07-29 13:00 ` Andrew Pinski
2003-07-29 13:28 ` Richard Guenther
2003-07-29 13:59 ` Andrew Pinski
2003-07-29 14:17 ` Gabriel Dos Reis
2003-07-29 13:14 ` Gabriel Dos Reis
2003-07-29 13:14 ` Steven Bosscher
2003-07-29 14:08 ` Gabriel Dos Reis
2003-07-29 14:24 ` Steven Bosscher
2003-07-29 14:24 ` Gabriel Dos Reis
2003-07-29 14:31 ` Gabriel Dos Reis
2003-07-29 14:40 ` Steven Bosscher
2003-07-29 15:11 ` Gabriel Dos Reis
2003-07-29 15:37 ` Michael Matz
2003-07-29 15:59 ` Gabriel Dos Reis
2003-07-29 15:59 ` Michael Matz
2003-07-29 16:05 ` Gabriel Dos Reis
2003-07-29 16:20 ` Rob Taylor
2003-07-29 14:36 ` Gabriel Dos Reis
2003-07-29 15:24 ` Richard Guenther
2003-07-29 16:30 ` Gabriel Dos Reis
2003-07-29 18:35 ` Richard Guenther
2003-07-29 14:51 ` Gabriel Dos Reis
2003-07-29 15:33 ` Steven Bosscher
2003-07-30 5:24 ` Alexandre Oliva
2003-07-30 5:33 ` Gabriel Dos Reis
2003-07-30 6:38 ` Alexandre Oliva
2003-07-30 10:32 ` Gabriel Dos Reis
2003-07-30 10:33 ` Alexandre Oliva
2003-07-30 10:46 ` Gabriel Dos Reis
2003-07-30 11:57 ` Alexandre Oliva
2003-07-30 12:20 ` Gabriel Dos Reis
2003-07-30 15:50 ` Scott Robert Ladd
2003-07-30 15:53 ` Steven Bosscher
2003-07-30 15:53 ` Richard Guenther
2003-07-30 16:01 ` Gabriel Dos Reis
2003-07-30 16:09 ` Steven Bosscher
2003-07-30 16:39 ` Gabriel Dos Reis
2003-07-30 16:17 ` Richard Guenther
2003-07-30 16:24 ` Steven Bosscher
2003-08-04 16:55 ` Bernd Schmidt
2003-08-04 17:08 ` Alexandre Oliva
2003-07-30 10:37 ` Steven Bosscher
2003-07-30 11:31 ` Gabriel Dos Reis
2003-07-30 15:44 ` Scott Robert Ladd
2003-07-30 17:10 ` Joe Buck
2003-07-30 17:32 ` Richard Guenther
2003-07-30 18:22 ` Daniel Berlin
2003-07-30 19:08 ` Richard Guenther
2003-07-30 19:12 ` Daniel Berlin
2003-07-30 17:06 ` Joe Buck
2003-07-30 17:26 ` Gabriel Dos Reis
2003-07-29 19:58 ` Neil Booth
2003-07-29 20:14 ` Gabriel Dos Reis
2003-07-29 20:33 ` Richard Guenther
2003-07-29 20:49 ` Gabriel Dos Reis
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