Re: code snippet

From	Rui Maciel <rui.maciel@gmail.com>
Newsgroups	comp.lang.c
Subject	Re: code snippet
Date	2011-12-22 19:21 +0000
Organization	Aioe.org NNTP Server
Message-ID	<jcvvvd$j97$1@speranza.aioe.org> (permalink)
References	(12 earlier) <28271069.79.1324514157943.JavaMail.geo-discussion-forums@prdv33> <0.f11c74e6cc5bf465d9c4.20111222031918GMT.87hb0tmgy1.fsf@bsb.me.uk> <9453445.440.1324566701765.JavaMail.geo-discussion-forums@prez5> <slrnjf6ocv.1rti.usenet-nospam@guild.seebs.net> <jcvrjq$feg$1@dont-email.me>

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BartC wrote:

>> 2.  It eliminates portability.
> 
> So what? If this is a product to be sold/used in thousands and millions,
> you'll probably find that a small number of platforms will dominate. Then
> it's worth producing a custom version for the top one or two. The rest can
> use the slow version.

I don't believe that the idea of replacing C with assembly, in this context, 
meant that the assembly instructions represented specialized routines for a 
specific platform.  In this context, replacing C with assembly meant 
replacing C with assembly, in the sense that the routine consisted of a 
single specialized piece of code which could only run on a very specific 
platform and that there wasn't any alternative to it.

>> 4.  It is very unlikely to produce a measurable benefit.
> 
> You're assuming this is for a one-off program that will only be run once.
> Then you could well spend more time programming than will be saved in
> runtime. But usually that is not the case.

Not necessarily.  Nowadays compilers do churn out optimized code, and 
chances are they do a far better job at it than any random programmer.  This 
means that, just by tweaking a single compiler flag, we may get all the 
optimizations which any random programmer might be able to use, without 
wasting days rewriting stuff and while avoiding to increase the complexity 
of our project.  And there's of course the risk of potentially introducing 
new non-trivial bugs which aren't easily catched, even with a debugger.

Rui Maciel

Thread

code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-18 20:51 -0500
  Re: code snippet Geoff <geoff@invalid.invalid> - 2011-12-18 18:29 -0800
    Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-18 21:51 -0500
      Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-18 22:24 -0500
        Re: code snippet Geoff <geoff@invalid.invalid> - 2011-12-18 19:53 -0800
          Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-18 23:32 -0500
            Re: code snippet Geoff <geoff@invalid.invalid> - 2011-12-18 20:57 -0800
              Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-19 00:01 -0500
                Re: code snippet Geoff <geoff@invalid.invalid> - 2011-12-18 21:13 -0800
                Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-19 16:42 -0500
      Re: code snippet Keith Thompson <kst-u@mib.org> - 2011-12-18 20:14 -0800
        Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-18 23:27 -0500
      Re: code snippet Rui Maciel <rui.maciel@gmail.com> - 2011-12-19 12:33 +0000
        Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-19 16:33 -0500
          Re: code snippet Rui Maciel <rui.maciel@gmail.com> - 2011-12-20 00:20 +0000
            Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-19 19:46 -0500
              Re: code snippet Rui Maciel <rui.maciel@gmail.com> - 2011-12-20 01:14 +0000
                Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-20 15:51 -0500
                Re: code snippet Rui Maciel <rui.maciel@gmail.com> - 2011-12-21 14:11 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-21 07:03 -0800
                Re: code snippet Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-21 21:41 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-21 16:35 -0800
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-22 01:03 +0000
                Re: code snippet Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-22 03:19 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-22 07:11 -0800
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-22 16:59 +0000
                Re: code snippet "io_x" <a@b.c.invalid> - 2011-12-22 18:38 +0100
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-22 10:40 -0800
                Re: code snippet Markus Wichmann <nullplan@gmx.net> - 2011-12-22 19:12 +0100
                Re: code snippet Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-12-28 03:50 -0800
                Re: code snippet "io_x" <a@b.c.invalid> - 2011-12-28 17:06 +0100
                Re: code snippet "io_x" <a@b.c.invalid> - 2012-01-01 20:04 +0100
                Re: code snippet Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-01 12:38 -0800
                Re: code snippet "io_x" <a@b.c.invalid> - 2012-01-02 10:14 +0100
                Re: code snippet Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-03 04:56 -0800
                Re: code snippet "io_x" <a@b.c.invalid> - 2012-01-03 18:26 +0100
                Re: code snippet Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-04 00:09 -0800
                Re: code snippet Ian Collins <ian-news@hotmail.com> - 2012-01-04 21:53 +1300
                Re: code snippet "io_x" <a@b.c.invalid> - 2012-01-04 16:14 +0100
                Re: code snippet Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-01 12:28 -0800
                Re: code snippet "io_x" <a@b.c.invalid> - 2012-01-02 10:18 +0100
                Re: code snippet Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-03 04:56 -0800
                Re: code snippet "BartC" <bc@freeuk.com> - 2011-12-22 18:05 +0000
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-22 18:14 +0000
                Re: code snippet superpollo <superpollo@tznvy.pbz> - 2011-12-22 20:00 +0100
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-22 19:08 +0000
                Re: code snippet superpollo <superpollo@tznvy.pbz> - 2011-12-22 22:43 +0100
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-22 21:57 +0000
                Re: code snippet BruceS <bruces42@hotmail.com> - 2011-12-23 16:26 -0800
                Re: code snippet Rui Maciel <rui.maciel@gmail.com> - 2011-12-22 19:21 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-22 11:33 -0800
                Re: code snippet "io_x" <a@b.c.invalid> - 2011-12-23 09:10 +0100
                Re: code snippet Rui Maciel <rui.maciel@gmail.com> - 2011-12-23 14:43 +0000
                Re: code snippet Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-23 17:14 +0000
                Re: code snippet Keith Thompson <kst-u@mib.org> - 2011-12-23 12:10 -0800
                Re: code snippet Walter Banks <walter@bytecraft.com> - 2012-01-03 14:24 -0500
                Re: code snippet Kaz Kylheku <kaz@kylheku.com> - 2012-01-03 19:58 +0000
                Re: code snippet Walter Banks <walter@bytecraft.com> - 2012-01-03 16:15 -0500
                Re: code snippet blp@cs.stanford.edu (Ben Pfaff) - 2012-01-03 13:26 -0800
                Re: code snippet Kaz Kylheku <kaz@kylheku.com> - 2012-01-03 22:04 +0000
                Re: code snippet Ian Collins <ian-news@hotmail.com> - 2012-01-04 15:44 +1300
                Re: code snippet "BartC" <bc@freeuk.com> - 2012-01-04 23:34 +0000
                Re: code snippet James Harris <james.harris.1@googlemail.com> - 2012-01-04 15:57 -0800
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2012-01-05 23:34 -0800
                Re: code snippet Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-06 00:40 -0800
                Re: code snippet Kleuske <kleuske@nowhere.net> - 2012-01-06 10:33 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2012-01-06 04:30 -0800
                Re: code snippet Ian Collins <ian-news@hotmail.com> - 2012-01-04 15:37 +1300
                Re: code snippet Kaz Kylheku <kaz@kylheku.com> - 2012-01-04 03:37 +0000
                Re: code snippet Ian Collins <ian-news@hotmail.com> - 2012-01-04 20:23 +1300
                Re: code snippet jacob navia <jacob@spamsink.net> - 2011-12-22 18:26 +0100
                Re: code snippet Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-22 19:34 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-22 11:57 -0800
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-22 20:18 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-22 12:52 -0800
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-22 20:37 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-22 13:27 -0800
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-22 21:57 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-22 14:09 -0800
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-22 21:57 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-23 04:01 -0800
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-22 14:24 -0800
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-22 21:57 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2012-01-01 23:06 -0800
                Re: code snippet Hans Vlems <hvlems@freenet.de> - 2011-12-22 23:35 -0800
                Re: code snippet "BartC" <bc@freeuk.com> - 2011-12-23 12:26 +0000
                Re: code snippet jacob navia <jacob@spamsink.net> - 2011-12-23 18:32 +0100
                Re: code snippet Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-12-28 04:04 -0800
                Re: code snippet "io_x" <a@b.c.invalid> - 2011-12-23 09:10 +0100
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-25 11:13 -0800
                Re: code snippet Seebs <usenet-nospam@seebs.net> - 2011-12-25 19:31 +0000
                Re: code snippet Rui Maciel <rui.maciel@gmail.com> - 2011-12-26 21:53 +0000
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-26 16:10 -0800
                Re: code snippet Keith Thompson <kst-u@mib.org> - 2011-12-26 18:11 -0800
                Re: code snippet 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-26 23:56 -0800
                Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-20 15:57 -0500
                Re: code snippet Rui Maciel <rui.maciel@gmail.com> - 2011-12-21 12:39 +0000
                Re: code snippet Bill Reid <hormelfree@gmail.com> - 2011-12-22 15:29 -0800
          Re: code snippet Geoff <geoff@invalid.invalid> - 2011-12-19 19:19 -0800
            Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-20 13:51 -0500
              Re: code snippet Geoff <geoff@invalid.invalid> - 2011-12-20 11:08 -0800
  Re: code snippet Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-12-19 11:37 +0000
    Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-19 16:38 -0500
      Re: code snippet "Morris Keesan" <mkeesan@post.harvard.edu> - 2011-12-19 17:02 -0500
    Re: code snippet "Bill Cunningham" <nospam@nspam.invalid> - 2011-12-19 17:21 -0500
      Re: code snippet John Gordon <gordon@panix.com> - 2011-12-19 22:35 +0000

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