Re: Which lean C compiler for 32-bit OS development

From	James Kuyper <jameskuyper@verizon.net>
Newsgroups	comp.lang.c
Subject	Re: Which lean C compiler for 32-bit OS development
Date	2011-12-11 09:03 -0500
Organization	A noiseless patient Spider
Message-ID	<jc2d6m$emu$1@dont-email.me> (permalink)
References	(1 earlier) <pan.2011.11.13.02.59.58.415000@nowhere.com> <j9ne44$je7$1@news.albasani.net> <4932c22a-41ad-4a4e-89dc-19adb2999327@g7g2000vbd.googlegroups.com> <slrnjbv2be.24po.usenet-nospam@guild.seebs.net> <4837eb1a-f82a-4c69-832d-d09ac24468c7@z17g2000vbe.googlegroups.com>

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On 12/10/2011 02:29 PM, James Harris wrote:
...
> ... In C there is usually a
> clear, direct and simple correspondence between C operations and a
> CPU's opcodes, and a similar correspondence between C data types and
> those supported by the CPU.

Not all machines had opcodes that match every C operations, and not all
C operations have corresponding single opcodes on every machine. Many
operations have long been emulated on some machines rather than being
directly supported; such as 32-bit integers on 8-bit machines, or 8-bit
types on 32-bit machines, or floating point operations on machines with
no FPU.

Also, optimization has always rendered the relationship less than
perfectly "clear, direct, and simple". Compare the assembly code
generated by the highest optimization level for a typical compiler with
your original C code; if the relationship is at all "clear, direct, and
simple", it's probably a compiler whose optimization capabilities are
substantially inferior to the current state of the art.
-- 
James Kuyper

Thread

Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-11-12 01:22 -0800
  Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-12 10:36 +0100
    Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-11-12 02:09 -0800
      Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-12 11:37 +0100
        Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-11-12 08:02 -0800
          Re: Which lean C compiler for 32-bit OS development Borax Man <rotflol2@hotmail.com> - 2011-11-13 10:24 +1100
          Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-13 10:29 +0100
        Re: Which lean C compiler for 32-bit OS development BGB <cr88192@hotmail.com> - 2011-11-12 15:06 -0700
    Re: Which lean C compiler for 32-bit OS development "ankh" <star67@venus.gov> - 2011-11-12 22:43 -0600
      Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-14 21:57 +0100
        Re: Which lean C compiler for 32-bit OS development Ian Collins <ian-news@hotmail.com> - 2011-11-15 10:16 +1300
        Re: Which lean C compiler for 32-bit OS development "Jo" <none@none.none> - 2011-11-19 22:59 -0600
          Re: Which lean C compiler for 32-bit OS development "BartC" <bc@freeuk.com> - 2011-11-20 12:58 +0000
            Re: Which lean C compiler for 32-bit OS development Fritz Wuehler <fritz@spamexpire-201111.rodent.frell.theremailer.net> - 2011-11-21 07:30 +0100
              Re: Which lean C compiler for 32-bit OS development "Jo" <none@none.none> - 2011-11-21 01:01 -0600
            Re: Which lean C compiler for 32-bit OS development "Jo" <none@none.none> - 2011-11-21 00:51 -0600
            Re: Which lean C compiler for 32-bit OS development Brian <nospam@nospam.com> - 2011-11-22 16:47 +0000
              Re: Which lean C compiler for 32-bit OS development James Kuyper <jameskuyper@verizon.net> - 2011-11-22 12:10 -0500
                Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-22 20:24 +0100
              Re: Which lean C compiler for 32-bit OS development Richard Sanders <lnr729@gmail.com> - 2011-11-22 10:58 -0800
                Re: Which lean C compiler for 32-bit OS development Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-24 00:27 -0800
              Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-22 20:13 +0100
                Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-23 23:13 +0100
              Re: Which lean C compiler for 32-bit OS development Friedrich Dominicus <just-for-news-frido@q-software-solutions.de> - 2011-11-23 06:28 +0100
                Re: Which lean C compiler for 32-bit OS development Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-11-23 02:45 -0800
                Re: Which lean C compiler for 32-bit OS development Willem <willem@toad.stack.nl> - 2011-11-23 10:57 +0000
                Re: Which lean C compiler for 32-bit OS development Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-11-24 01:31 -0800
              Re: Which lean C compiler for 32-bit OS development "BartC" <bc@freeuk.com> - 2011-11-23 10:58 +0000
              Re: Which lean C compiler for 32-bit OS development Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-24 00:26 -0800
    Re: Which lean C compiler for 32-bit OS development Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-14 01:33 -0800
      Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-11-14 17:13 +0000
        Re: Which lean C compiler for 32-bit OS development Joe Wright <joewwright@comcast.net> - 2011-11-14 14:36 -0500
        Re: Which lean C compiler for 32-bit OS development Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-15 00:56 -0800
  Re: Which lean C compiler for 32-bit OS development Nobody <nobody@nowhere.com> - 2011-11-13 02:59 +0000
    Re: Which lean C compiler for 32-bit OS development Joe Wright <joewwright@comcast.net> - 2011-11-12 22:13 -0500
      Re: Which lean C compiler for 32-bit OS development "ankh" <star67@venus.gov> - 2011-11-13 00:03 -0600
      Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-14 21:55 +0100
        Re: Which lean C compiler for 32-bit OS development Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-15 00:56 -0800
        Re: Which lean C compiler for 32-bit OS development ImpalerCore <jadill33@gmail.com> - 2011-11-15 07:05 -0800
          Re: Which lean C compiler for 32-bit OS development Keith Thompson <kst-u@mib.org> - 2011-11-15 14:42 -0800
            Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-16 00:17 +0100
            Re: Which lean C compiler for 32-bit OS development ImpalerCore <jadill33@gmail.com> - 2011-11-15 17:50 -0800
    Re: Which lean C compiler for 32-bit OS development BGB <cr88192@hotmail.com> - 2011-11-12 20:38 -0700
      Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-11-13 00:00 -0800
        Re: Which lean C compiler for 32-bit OS development BGB <cr88192@hotmail.com> - 2011-11-13 01:23 -0700
        Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-11-13 09:10 +0000
          Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-13 10:33 +0100
            Re: Which lean C compiler for 32-bit OS development Ian Collins <ian-news@hotmail.com> - 2011-11-13 23:03 +1300
              Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-11-13 11:17 +0100
          Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-10 11:29 -0800
            Re: Which lean C compiler for 32-bit OS development Ian Collins <ian-news@hotmail.com> - 2011-12-11 09:57 +1300
              Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-10 14:26 -0800
                Re: Which lean C compiler for 32-bit OS development Ian Collins <ian-news@hotmail.com> - 2011-12-11 11:38 +1300
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-10 16:01 -0800
                Re: Which lean C compiler for 32-bit OS development Ian Collins <ian-news@hotmail.com> - 2011-12-11 13:18 +1300
                Re: Which lean C compiler for 32-bit OS development Robert Wessel <robertwessel2@yahoo.com> - 2011-12-10 22:50 -0600
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-12 11:25 -0800
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-11 03:45 +0000
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-12 12:06 -0800
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-12 20:02 +0000
                Re: Which lean C compiler for 32-bit OS development John Tsiombikas <nuclear@member.fsf.org> - 2011-12-13 06:28 +0000
                Re: Which lean C compiler for 32-bit OS development Robert Wessel <robertwessel2@yahoo.com> - 2011-12-13 00:32 -0600
                Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-12-13 10:57 +0100
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-10 23:20 +0000
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-12 12:38 -0800
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-12 20:15 +0000
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-12 13:51 -0800
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-12 22:32 +0000
                Re: Which lean C compiler for 32-bit OS development John Tsiombikas <nuclear@member.fsf.org> - 2011-12-13 06:40 +0000
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-13 09:19 +0000
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-17 00:52 -0800
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-14 13:00 -0800
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-14 21:53 +0000
                Re: Which lean C compiler for 32-bit OS development Ian Collins <ian-news@hotmail.com> - 2011-12-15 11:18 +1300
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-15 11:16 -0800
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-15 19:35 +0000
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-15 13:03 -0800
                Re: Which lean C compiler for 32-bit OS development Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-12-16 03:55 -0800
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-16 19:50 +0000
                Re: Which lean C compiler for 32-bit OS development Robert Wessel <robertwessel2@yahoo.com> - 2011-12-12 16:54 -0600
                Re: Which lean C compiler for 32-bit OS development Ian Collins <ian-news@hotmail.com> - 2011-12-13 12:03 +1300
                Re: Which lean C compiler for 32-bit OS development Robert Wessel <robertwessel2@yahoo.com> - 2011-12-12 17:19 -0600
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-15 11:52 -0800
                Re: Which lean C compiler for 32-bit OS development Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-12-12 18:34 -0500
                Re: Which lean C compiler for 32-bit OS development "io_x" <a@b.c.invalid> - 2011-12-13 09:43 +0100
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-15 11:33 -0800
            Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-10 21:13 +0000
              Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-10 15:10 -0800
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-10 23:31 +0000
                Re: Which lean C compiler for 32-bit OS development jacob navia <jacob@spamsink.net> - 2011-12-11 01:57 +0100
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-12 11:46 -0800
                Re: Which lean C compiler for 32-bit OS development James Kuyper <jameskuyper@verizon.net> - 2011-12-12 15:23 -0500
                Re: Which lean C compiler for 32-bit OS development Seebs <usenet-nospam@seebs.net> - 2011-12-12 20:02 +0000
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-12 14:00 -0800
                Re: Which lean C compiler for 32-bit OS development James Kuyper <jameskuyper@verizon.net> - 2011-12-12 17:24 -0500
                Re: Which lean C compiler for 32-bit OS development Robert Wessel <robertwessel2@yahoo.com> - 2011-12-12 17:06 -0600
                Re: Which lean C compiler for 32-bit OS development James Kuyper <jameskuyper@verizon.net> - 2011-12-12 18:16 -0500
            Re: Which lean C compiler for 32-bit OS development James Kuyper <jameskuyper@verizon.net> - 2011-12-11 09:03 -0500
              Re: Which lean C compiler for 32-bit OS development 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-11 08:57 -0800
              Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-12 12:11 -0800
                Re: Which lean C compiler for 32-bit OS development Keith Thompson <kst-u@mib.org> - 2011-12-12 14:25 -0800
                Re: Which lean C compiler for 32-bit OS development James Harris <james.harris.1@googlemail.com> - 2011-12-14 13:44 -0800
  Re: Which lean C compiler for 32-bit OS development "ankh" <star67@venus.gov> - 2011-11-12 22:42 -0600

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