Re: code snippet

From	Rui Maciel <rui.maciel@gmail.com>
Newsgroups	comp.lang.c
Subject	Re: code snippet
Date	2011-12-23 14:43 +0000
Organization	Aioe.org NNTP Server
Message-ID	<jd2438$1ld$1@speranza.aioe.org> (permalink)
References	(14 earlier) <9453445.440.1324566701765.JavaMail.geo-discussion-forums@prez5> <slrnjf6ocv.1rti.usenet-nospam@guild.seebs.net> <jcvrjq$feg$1@dont-email.me> <jcvvvd$j97$1@speranza.aioe.org> <4ef43690$0$1377$4fafbaef@reader2.news.tin.it>

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io_x wrote:

>> Not necessarily.  Nowadays compilers do churn out optimized code, and
>> chances are they do a far better job at it than any random programmer.
> 
> i claim that the above is false if the code generated is not easy
> scalable, not easy comprensible by humans
> i'm sorry, but compilers not has to write algoritms for you
> you have to write algoritms and the compiler has to traslate them
> litterally

My assertion wasn't based on the idea that compilers have to write 
algorithms.  My assertion is that, given any algorithm expressed by any 
random programmer, the set of optimization techniques which have been 
implemented in today's popular compilers end up generating code which is 
more efficient than that which would otherwise be written by hand by any 
random programmer.  

Naturally, there is always someone somewhere who is quite capable of 
performing enough code voodoo to churn out more efficient code than that 
which is produced by a compiler.  Even in that case, there is the problem of 
how fast he is able to write it, how fast the code is executed and the 
relation between how much time was spent writing it and the added value 
which has been obtained. 

As a somewhat related oddity, here is a talk by Guy Steele himself[1].  In 
it, he discusses some techniques he employed to write a couple of programs, 
along with some optimization tricks he employed.  Among those, he refers in 
some parts how he reduced the program size by using the value of some 
opcodes as constants.  I doubt that today's compiler writers implement these 
sort of tricks.  This means that mr Steele's code is better than the 
equivalent code which might be generated by a compiler.  But the thing is, 
not everyone is as proficient at it as mr Steele, or even close to it, which 
brings us back to the assertion I've made.

Rui Maciel

[1] http://www.infoq.com/presentations/Thinking-Parallel-Programming

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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