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Groups > comp.programming > #2319
| From | "BartC" <bc@freeuk.com> |
|---|---|
| Newsgroups | comp.programming |
| Subject | Re: 64 bit code |
| Date | 2012-10-11 13:11 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <k56d2i$2vq$1@dont-email.me> (permalink) |
| References | (2 earlier) <k5488o$cbv$1@dont-email.me> <k54kd4$g1o$1@speranza.aioe.org> <k54n8b$i3u$1@dont-email.me> <adm8sjFja8tU1@mid.individual.net> <k55cjk$joa$1@news.albasani.net> |
"BGB" <cr88192@hotmail.com> wrote in message news:k55cjk$joa$1@news.albasani.net... > On 10/10/2012 4:50 PM, Ian Collins wrote: >> On 10/11/12 09:52, BartC wrote: >>> >>> With the x86-64, it seems to be all or nothing: either run everything as >>> 64-bits, or run in compatible 32-bit mode, where you don't have access >>> to >>> the extra, wider registers, nor to 64-bit arithmetic. >> >> Which equates to a net loss of nothing and net gain of the 64 bit mode! >> >> Now you have the ability to build and test 32 and 64 bit versions of >> your code to see which performs best. >> > > it is worth noting that there is also the x32 ABI, which is basically a > 32-bit sub-mode of x86-64 (mostly off in Linux land, it is based on the > SysV/AMD64 ABI). > > in this sub-mode, basically the extended registers and arithmetic are > still available, but there is an ABI-level convention to only use 32-bit > pointers and stay within the low 4GB of memory. Is this mode supported by the hardware, or does it depend on software zero-extending pointers as needed to the 64-bits that are expected? I suspect the latter, from what I have been able to find out. -- Bartc
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64 bit code bob <bob@coolfone.comze.com> - 2012-10-10 08:22 -0700
Re: 64 bit code Jongware <jongware@no-spam.plz> - 2012-10-10 17:35 +0200
Re: 64 bit code "BartC" <bc@freeuk.com> - 2012-10-10 17:37 +0100
Re: 64 bit code Robert Wessel <robertwessel2@yahoo.com> - 2012-10-10 12:54 -0500
Re: 64 bit code Fritz Wuehler <fritz@spamexpire-201210.rodent.frell.theremailer.net> - 2012-10-10 21:37 +0200
Re: 64 bit code BGB <cr88192@hotmail.com> - 2012-10-10 21:46 -0500
Re: 64 bit code Rui Maciel <rui.maciel@gmail.com> - 2012-10-10 20:43 +0100
Re: 64 bit code "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2012-10-12 08:40 +0100
Re: 64 bit code BGB <cr88192@hotmail.com> - 2012-10-12 12:36 -0500
Re: 64 bit code Rui Maciel <rui.maciel@gmail.com> - 2012-10-12 20:57 +0100
Re: 64 bit code "BartC" <bc@freeuk.com> - 2012-10-12 21:30 +0100
Re: 64 bit code BGB <cr88192@hotmail.com> - 2012-10-12 16:33 -0500
Re: 64 bit code "BartC" <bc@freeuk.com> - 2012-10-13 00:44 +0100
Re: 64 bit code Ben Pfaff <blp@cs.stanford.edu> - 2012-10-12 20:07 -0700
Re: 64 bit code Rui Maciel <rui.maciel@gmail.com> - 2012-10-13 11:11 +0100
Re: 64 bit code "BartC" <bc@freeuk.com> - 2012-10-13 13:11 +0100
Re: 64 bit code Willem <willem@turtle.stack.nl> - 2012-10-13 12:34 +0000
Re: 64 bit code BGB <cr88192@hotmail.com> - 2012-10-13 09:50 -0500
Re: 64 bit code "BartC" <bc@freeuk.com> - 2012-10-13 17:25 +0100
Re: 64 bit code Rui Maciel <rui.maciel@gmail.com> - 2012-10-13 17:53 +0100
Re: 64 bit code Rui Maciel <rui.maciel@gmail.com> - 2012-10-13 17:05 +0100
Re: 64 bit code "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-10-13 10:37 +0200
Re: 64 bit code "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2012-10-27 12:18 +0100
Re: 64 bit code "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2012-10-27 12:54 +0100
Re: 64 bit code "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-10-27 15:13 +0200
Re: 64 bit code Robert Miles <milesrf@Usenet-News.net> - 2012-10-28 04:12 -0500
Re: 64 bit code "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-10-28 13:10 +0100
Re: 64 bit code "LudovicoVan" <julio@diegidio.name> - 2012-10-29 04:38 +0000
Re: 64 bit code "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-10-29 09:30 +0100
Re: 64 bit code "LudovicoVan" <julio@diegidio.name> - 2012-10-30 22:09 +0000
Re: 64 bit code "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-10-31 09:47 +0100
Re: 64 bit code "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-10-31 09:55 +0100
Re: 64 bit code "LudovicoVan" <julio@diegidio.name> - 2012-10-31 14:32 +0000
Re: 64 bit code Patricia Shanahan <pats@acm.org> - 2012-10-27 08:51 -0700
Re: 64 bit code "LudovicoVan" <julio@diegidio.name> - 2012-10-27 17:23 +0100
Re: 64 bit code "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-10-27 20:43 +0200
Re: 64 bit code "LudovicoVan" <julio@diegidio.name> - 2012-10-30 22:16 +0000
Re: 64 bit code "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-10-31 09:53 +0100
Re: 64 bit code "LudovicoVan" <julio@diegidio.name> - 2012-10-31 14:33 +0000
Re: 64 bit code Fritz Wuehler <fritz@spamexpire-201211.rodent.frell.theremailer.net> - 2012-11-01 00:25 +0100
Re: 64 bit code Rui Maciel <rui.maciel@gmail.com> - 2012-10-10 21:04 +0100
Re: 64 bit code "BartC" <bc@freeuk.com> - 2012-10-10 21:52 +0100
Re: 64 bit code Ian Collins <ian-news@hotmail.com> - 2012-10-11 10:50 +1300
Re: 64 bit code BGB <cr88192@hotmail.com> - 2012-10-10 21:54 -0500
Re: 64 bit code "BartC" <bc@freeuk.com> - 2012-10-11 13:11 +0100
Re: 64 bit code BGB <cr88192@hotmail.com> - 2012-10-11 11:17 -0500
Re: 64 bit code Ben Pfaff <blp@cs.stanford.edu> - 2012-10-10 13:17 -0700
Re: 64 bit code Fritz Wuehler <fritz@spamexpire-201210.rodent.frell.theremailer.net> - 2012-10-11 19:36 +0200
Re: 64 bit code Ben Pfaff <blp@cs.stanford.edu> - 2012-10-12 08:13 -0700
Re: 64 bit code Rui Maciel <rui.maciel@gmail.com> - 2012-10-10 20:38 +0100
Re: 64 bit code Robin Vowels <robin.vowels@gmail.com> - 2012-10-10 15:22 -0700
Re: 64 bit code Robert Miles <milesrf@Usenet-News.net> - 2012-10-12 02:13 -0500
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