Re: Good practical language and OS agnostic text?

From	"BartC" <bc@freeuk.com>
Newsgroups	comp.compilers
Subject	Re: Good practical language and OS agnostic text?
Date	2012-04-21 12:01 +0100
Organization	A noiseless patient Spider
Message-ID	<12-04-058@comp.compilers> (permalink)
References	<12-04-019@comp.compilers> <12-04-023@comp.compilers> <12-04-033@comp.compilers>

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"Hans-Peter Diettrich" <DrDiettrich1@aol.com> wrote in message
> Life is too short for writing an full-blown heavily-optimizing
> production compiler from scratch, including its whole RTL.

Especially when there might only be difference of 2 or 3 times between
performance of the best and worst code.

My own compiler for x86-32 generates pretty awful code, and on a small
handful of mostly numeric benchmarks, it averages out about 2.5 x as
slow as gcc on it's highest optimisation setting. But, gcc often
recognises these benchmarks as doing nothing useful, so removes whole
sections of code!

The true factor is probably between 1 and 2, and for critical code, I just
use inline assembly code, so it's not real problem. I'm rewriting that
compiler at the moment, and will probably achieve somewhat better
performance, but don't worry about it too much.

--
Bartc

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Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-17 21:28 +0000
  Re: Good practical language and OS agnostic text? Philip Herron <redbrain@gcc.gnu.org> - 2012-04-18 14:25 +0100
    Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-19 16:32 +0000
      Re: Good practical language and OS agnostic text? arnold@skeeve.com (Aharon Robbins) - 2012-04-20 03:58 +0000
        Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-22 10:10 +0000
      Re: Good practical language and OS agnostic text? "BartC" <bc@freeuk.com> - 2012-04-20 09:45 +0100
        Re: Good practical language and OS agnostic text? "Jonathan Thornburg" <jthorn@astro.indiana.edu> - 2012-04-21 15:04 +0000
  Re: Good practical language and OS agnostic text? BGB <cr88192@hotmail.com> - 2012-04-18 08:39 -0700
    Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-19 17:32 +0000
  Re: Good practical language and OS agnostic text? Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2012-04-18 18:24 +0200
    Re: Good practical language and OS agnostic text? Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2012-04-19 13:53 +0200
      Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-21 03:07 +0000
      Re: Good practical language and OS agnostic text? "BartC" <bc@freeuk.com> - 2012-04-21 12:01 +0100
        Re: code quality, was Good practical language and OS agnostic text? Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2012-04-22 12:41 +0200
    Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-19 11:31 +0000
      Re: Good practical language and OS agnostic text? "Jonathan Thornburg" <jthorn@astro.indiana.edu> - 2012-04-20 16:19 +0000
  Re: Good practical language and OS agnostic text? "Derek M. Jones" <derek@knosof.co.uk> - 2012-04-18 18:16 +0100
    Re: Good practical language and OS agnostic text? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-04-18 22:43 +0000
      Re: Good practical language and OS agnostic text? BGB <cr88192@hotmail.com> - 2012-04-19 00:05 -0700
      Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-19 11:31 +0000
    Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-19 16:32 +0000
  Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-18 19:30 +0000
    Re: Good practical language and OS agnostic text? "BartC" <bc@freeuk.com> - 2012-04-19 18:43 +0100
  Re: Good practical language and OS agnostic text? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-04-18 20:29 +0000
    Re: Good practical language and OS agnostic text? Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2012-04-19 14:20 +0200
    Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-19 19:05 +0000
      Re: Good practical language and OS agnostic text? Uli Kusterer <ulimakesacompiler@googlemail.com> - 2012-04-21 11:30 +0200
  Re: Good practical language and OS agnostic text? Roberto Waltman <usenet@rwaltman.com> - 2012-04-18 22:00 -0400
    Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-19 11:31 +0000
      Re: Good practical language and OS agnostic text? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-04-20 07:02 +0000
        Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-22 11:10 +0000
          Re: Good practical language and OS agnostic text? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-04-22 23:56 +0000
        Re: PL/360, was Good practical language and OS agnostic text? ArarghMail204@Arargh.com - 2012-04-24 19:13 -0500
  Re: Good practical language and OS agnostic text? Bakul Shah <usenet@bitblocks.com> - 2012-04-18 21:15 -0700
    Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-20 16:06 +0000
  Re: Good practical language and OS agnostic text? torbenm@diku.dk (Torben Ægidius Mogensen) - 2012-04-19 14:58 +0200
    Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-20 16:06 +0000
  Re: Good practical language and OS agnostic text? "Joe Schmo" <askmeforit@myisp.com> - 2012-04-21 02:53 -0600
    Re: Writing parsers, was Good practical language and OS agnostic text? Uli Kusterer <ulimakesacompiler@googlemail.com> - 2012-04-22 16:18 +0200
    Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-23 19:12 +0000
  Re: Good practical language and OS agnostic text? Uli Kusterer <ulimakesacompiler@googlemail.com> - 2012-04-21 11:22 +0200
    Re: Good practical language and OS agnostic text? BGB <cr88192@hotmail.com> - 2012-04-21 18:58 -0700
      Re: writing interpreters, was Good practical language and OS agnostic text? Uli Kusterer <ulimakesacompiler@googlemail.com> - 2012-04-22 12:53 +0200
        Re: writing interpreters, was Good practical language and OS agnostic text? BGB <cr88192@hotmail.com> - 2012-04-22 12:29 -0700
      Re: generating bytecode, was Good practical language and OS agnostic text? Uli Kusterer <ulimakesacompiler@googlemail.com> - 2012-04-22 13:12 +0200
      Re: Recursive descent parsing and optimization, was Good practical language and OS agnostic text? "BartC" <bc@freeuk.com> - 2012-04-22 12:51 +0100
        Re: Recursive descent parsing and optimization, was Good practical language and OS agnostic text? "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-04-22 18:18 +0200
          Re: Recursive descent parsing and optimization, was Good practical language and OS agnostic text? "Bartc" <bartc@freeuk.com> - 2012-04-23 10:59 +0100
        Re: Recursive descent parsing and optimization, was Good practical language and OS agnostic text? BGB <cr88192@hotmail.com> - 2012-04-22 13:45 -0700
    Re: Good practical language and OS agnostic text? compilers@is-not-my.name - 2012-04-22 22:11 +0000
      Re: Good practical language and OS agnostic text? "BartC" <bc@freeuk.com> - 2012-04-23 18:41 +0100
  Re: Good practical language and OS agnostic text? basile@starynkevitch.net - 2012-05-02 22:16 -0700
    Re: Good practical language and OS agnostic text? Johann 'Myrkraverk' Oskarsson <johann@2ndquadrant.com> - 2012-06-06 16:52 +0000

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