From: "Richard B. Kreckel" <kreckel@ginac.de>
To: <gcc@gcc.gnu.org>
Cc: Richard Guenther <rguenth@tat.physik.uni-tuebingen.de>,
Gabriel Dos Reis <gdr@integrable-solutions.net>,
<Richard.Earnshaw@arm.com>,
Karel Gardas <kgardas@objectsecurity.com>,
Alexandre Oliva <aoliva@redhat.com>
Subject: Re: std::pow implementation
Date: Thu, 31 Jul 2003 00:30:00 -0000 [thread overview]
Message-ID: <Pine.LNX.4.33.0307302258001.22574-100000@higgs.physik.uni-mainz.de> (raw)
In-Reply-To: <Pine.LNX.4.44.0307301553090.561-100000@goofy>
Hi,
On Wed, 30 Jul 2003, Richard Guenther wrote:
> On 30 Jul 2003, Gabriel Dos Reis wrote:
> > Richard Earnshaw <rearnsha@arm.com> writes:
> > | > Richard Earnshaw <rearnsha@arm.com> writes:
> > | > [...]
> > | > | Now, assume that the amount of code in the a!=1 case is reduced. At what
> > | > | point does it become beneficial to always inline? Can the programmer
> > | > | tell?
> > | >
> > | > He can profile.
> > |
> > | Profiling doesn't help if the answer comes back as "sometimes" (function
> > | foo's use of bar is best inlined, function wibble's use of bar is best not
> > | inlined).
> >
> > The cases where it most does not help is when the compiler decides it
> > knows better and goes on using his own programmed logic.
>
> Oh - I thought you meant profile directed inlining decisions by the
> compiler, not by the user. The latter is not useful.
Sometimes, the latter *is* useful. For a project where speed was quite
essential I have once gone through the whole cycle (trial inline) ->
(compile) -> (benchmark/profile/read the disassembled output) several
dozen times till I found out some good inlining patterns. Without profile
directed inlining at a global level there isn't any alternative in extreme
cases.
Transmuting the meaning of "inline" *is* counterproductive. The compiler
should trust the programmer.
[...]
> The only sane possible semantics I see are:
>
> 1. inline declared functions are inlined always if technically possible
> 2. the inline keyword has no effect
> 3. inline is handled in an implementation defined manner (as stated in the
> standard), maybe by adjusting the set of functions considered for inlining,
> as gcc does.
>
> I argue we cannot go away from #3 without portability problems (to other
> compilers and architectures).
I cannot agree. Sticking to the original meaning of "inline" (a
combination of #1 and #3, as Gaby proposed) will definitely reduce
portability problems, to other compilers at least. The fact that many
compilers come up with their own semantics is quite sad.
Regards
-richy.
--
Richard B. Kreckel
<Richard.Kreckel@GiNaC.DE>
<http://www.ginac.de/~kreckel/>
next prev parent reply other threads:[~2003-07-30 21:49 UTC|newest]
Thread overview: 214+ messages / expand[flat|nested] mbox.gz Atom feed top
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 [this message]
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
2003-07-30 6:13 ` gcc do not consider the head file change when compiling??? Mojx
2003-07-30 12:09 ` Gerald Pfeifer
2003-07-30 18:20 ` Zack Weinberg
2003-07-29 12:53 ` std::pow implementation 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
2003-07-30 12:55 Stephan T. Lavavej
2003-07-30 12:59 ` Gabriel Dos Reis
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
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
2003-07-30 15:56 ` Scott Robert Ladd
2003-07-30 16:16 ` Steven Bosscher
2003-07-30 16:47 ` Scott Robert Ladd
2003-07-30 13:25 Robert Dewar
2003-07-30 13:52 Robert Dewar
2003-07-30 14:02 ` Richard Guenther
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 14:04 Robert Dewar
2003-07-30 14:10 ` Gabriel Dos Reis
2003-07-30 14:05 Robert Dewar
2003-07-30 14:14 ` Gabriel Dos Reis
2003-07-30 14:11 Robert Dewar
2003-07-30 14:29 ` Richard Guenther
2003-07-30 14:18 Robert Dewar
2003-07-30 14:31 ` Richard Earnshaw
2003-07-30 14:36 ` Richard Guenther
2003-07-30 14:21 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 14:25 Robert Dewar
2003-07-30 14:49 ` Gabriel Dos Reis
2003-07-30 16:06 Richard Guenther
2003-07-30 16:37 ` Martin Reinecke
2003-07-30 16:08 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 21:49 Robert Dewar
2003-07-30 22:28 Robert Dewar
2003-07-30 22:49 Robert Dewar
2003-07-31 10:19 Martin Reinecke
2003-07-31 10:38 ` Gabriel Dos Reis
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 11:50 Robert Dewar
2003-07-31 12:05 Robert Dewar
2003-07-31 13:00 ` Gabriel Dos Reis
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
2003-08-04 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 17:43 Robert Dewar
2003-08-04 17:53 ` 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 18:08 Robert Dewar
2003-08-04 18:17 ` Gabriel Dos Reis
2003-08-04 18:21 Robert Dewar
2003-08-04 18:22 Robert Dewar
2003-08-04 18:29 ` Gabriel Dos Reis
2003-08-04 18:42 Robert Dewar
2003-08-04 18:46 ` Gabriel Dos Reis
2003-08-04 22:57 Robert Dewar
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