linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: "Ihar \"Philips\" Filipau" <filia@softhome.net>
To: Miles Bader <miles@gnu.org>
Cc: Hollis Blanchard <hollisb@us.ibm.com>,
	Otto Solares <solca@guug.org>,
	"J.A. Magallon" <jamagallon@able.es>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	David McCullough <davidm@snapgear.com>,
	uclinux-dev@uclinux.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Kernel 2.6 size increase - get_current()?
Date: Mon, 28 Jul 2003 10:14:17 +0200	[thread overview]
Message-ID: <3F24DB59.1010600@softhome.net> (raw)
In-Reply-To: <buowue3l4ni.fsf@mcspd15.ucom.lsi.nec.co.jp>

Miles Bader wrote:
> Hollis Blanchard <hollisb@us.ibm.com> writes:
> 
>>Inlines don't always help performance (depending on cache sizes, branch 
>>penalties, frequency of code access...), but they do always increase 
>>code size.
> 
> 
> Um, inlining can often _decrease_ code size because it gives the
> compiler substantial new opportunities for optimization (the function
> body is no longer opaque, so the compiler has a lot more info, and any
> optimizations done on the inlined body can be context-specific).
> 

   starting from -O3 gcc do always trys to do inlining.
   was observed on gcc 3.2 and I beleive I saw the same 2.95.3

   compile this test with 02 & 03:
-------------------
#include <stdio.h>

int aaa() { return 32; }

int main() {
         int b = aaa();
         printf("hello %d \n", b);
         return 0;
}
------------------

    and then objdump -d to see the difference between main()s: 02 - you 
will see function call, 03 - you will see just raw number 0x20 used.


  reply	other threads:[~2003-07-28  7:58 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-23 18:46 Kernel 2.6 size increase Bernardo Innocenti
2003-07-23 19:14 ` Richard B. Johnson
2003-07-23 20:07   ` David S. Miller
2003-07-23 21:47     ` Randy.Dunlap
2003-07-23 19:32 ` [uClinux-dev] " Christoph Hellwig
2003-07-23 20:11   ` David S. Miller
2003-07-23 20:15     ` Christoph Hellwig
2003-07-23 20:22       ` David S. Miller
2003-07-23 20:27         ` Christoph Hellwig
2003-07-23 22:35           ` [uClinux-dev] Kernel 2.6 size increase - get_current()? Bernardo Innocenti
2003-07-23 22:37             ` Alan Cox
2003-07-23 23:00               ` Bernardo Innocenti
2003-07-24  5:06                 ` David McCullough
2003-07-24 11:28                   ` Alan Cox
2003-07-24 12:04                     ` David McCullough
2003-07-24 14:48                       ` Alan Cox
2003-07-25 18:25                       ` bill davidsen
2003-07-24 15:30                     ` Hollis Blanchard
2003-07-24 19:37                       ` Alan Cox
2003-07-24 19:51                         ` Hollis Blanchard
2003-07-24 21:20                           ` J.A. Magallon
2003-07-25  4:22                             ` Otto Solares
2003-07-25 14:38                               ` Hollis Blanchard
2003-07-28  3:19                                 ` Miles Bader
2003-07-28  8:14                                   ` Ihar "Philips" Filipau [this message]
2003-07-28  8:58                                     ` Miles Bader
2003-07-28  9:03                                       ` Ihar "Philips" Filipau
2003-07-23 21:57   ` [uClinux-dev] Kernel 2.6 size increase Bernardo Innocenti
2003-07-23 22:07     ` Bernardo Innocenti
2003-07-23 22:27       ` Willy Tarreau
2003-07-23 22:34         ` Alan Cox
2003-07-24 20:27         ` Bernardo Innocenti
2003-07-25 15:46           ` Christoph Hellwig
2003-07-25 23:55             ` [PATCH] Make I/O schedulers optional (Was: Re: Kernel 2.6 size increase) Bernardo Innocenti
2003-07-26  8:17               ` Andrew Morton
2003-07-26 12:40                 ` Bernardo Innocenti
2003-07-26 14:07                   ` Jens Axboe
2003-07-26 23:42                     ` Bernardo Innocenti
2003-07-26 23:41                       ` Jens Axboe
2003-07-28 17:13             ` [uClinux-dev] Kernel 2.6 size increase Nicolas Pitre
2003-07-28 23:02               ` Bernardo Innocenti
2003-07-29  2:36                 ` Miles Bader
2003-08-08 13:25                 ` [uClinux-dev] " David Woodhouse
2003-08-08 14:37                   ` Bernardo Innocenti
2003-08-08 14:43                     ` David Woodhouse
2003-07-25 18:16           ` bill davidsen
2003-07-29 22:29           ` Tom Rini
2003-07-29 22:48             ` Alan Cox
2003-07-29 23:06               ` Tom Rini
2003-07-30  2:07                 ` Miles Bader
2003-07-30 15:33                   ` Tom Rini
2003-07-31  1:49                     ` Miles Bader
2003-07-31  4:17                       ` Tom Rini
2003-07-31  5:03                         ` Miles Bader
2003-07-31 15:24                           ` Tom Rini
2003-07-30  2:49             ` [uClinux-dev] " Bernardo Innocenti
2003-07-30 15:35               ` Tom Rini
2003-07-30 16:45                 ` [uClinux-dev] Kernel 2.6 size increase (PATCH) Bernardo Innocenti

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=3F24DB59.1010600@softhome.net \
    --to=filia@softhome.net \
    --cc=alan@lxorguk.ukuu.org.uk \
    --cc=davidm@snapgear.com \
    --cc=hollisb@us.ibm.com \
    --cc=jamagallon@able.es \
    --cc=linux-kernel@vger.kernel.org \
    --cc=miles@gnu.org \
    --cc=solca@guug.org \
    --cc=uclinux-dev@uclinux.org \
    --subject='Re: Kernel 2.6 size increase - get_current()?' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).