From: Comeau At9Fans <comeauat9fans@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] integer width on AMD64 (was: Re: AMD64 system)
Date: Sat, 5 May 2012 17:00:24 -0400 [thread overview]
Message-ID: <CAE9W7-jS1hUY_5V_+DU0BSTuXGfFuEK96ZqYPgTdMEJ3T_LhCg@mail.gmail.com> (raw)
In-Reply-To: <1411330.QJAbfBr5F9@blitz>
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On Sat, May 5, 2012 at 11:33 AM, dexen deVries <dexen.devries@gmail.com>wrote:
> On Wednesday 25 of April 2012 15:32:06 erik quanstrom wrote:
> > also, in case you missed it sizeof(int)==sizeof(long)==4 on both 32
> > and 64 bit plan 9, so recompiled programs won't get bigger integers
> > just for the recompiling.
>
>
> pardon silly question, but... why, on 64bit machine, P9 uses 32bit ints and
> longs?
>
> my impression is, int was supposed to match machine's preferred (best
> performance etc.) integeral datatype, and long was supposed to be enough to
> hold a pointer? (i.e., sizeof(long) >= sizeof(void*))
Re "supposed" if you mean according to say Standard C, no. Even so-called
K&R C was not black and white regarding this per se. Standard C only
provided minimum sizes. Indeed, there is often preferences, but that's
usually up to vendors, and lots of it yield *-defined behaviors. As it
should.
There is also the issue of that, if, you really want a 64-bit integer,
then, using int is certainly moving towards a direction of a programming
error, since int does not often yield such a beast, even on so-called
systems which could provide it. C99 provides for stuff such
as int_least64_t for those who really need such.
--
Greg Comeau / 4.3.10.1 with C++0xisms now in beta!
Comeau C/C++ ONLINE ==> http://www.comeaucomputing.com/tryitout
World Class Compilers: Breathtaking C++, Amazing C99, Fabulous C90.
Comeau C/C++ with Dinkumware's Libraries... Have you tried it?
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next prev parent reply other threads:[~2012-05-05 21:00 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAL3m8eAf2Yjpg77wtykTSPnyKHxKHYc5YWfWH2L8CNjc86P1kA@mail.gmail.c>
2012-04-25 14:28 ` [9fans] AMD64 system erik quanstrom
2012-04-25 18:04 ` Strake
2012-04-25 18:27 ` Lyndon Nerenberg
2012-04-25 18:49 ` Matthew Veety
2012-04-25 19:09 ` Strake
2012-04-25 19:15 ` John Floren
2012-04-25 19:57 ` Strake
2012-04-25 20:04 ` John Floren
2012-04-25 20:30 ` Strake
2012-04-25 20:43 ` John Floren
2012-04-26 1:11 ` Strake
2012-04-26 1:21 ` andrey mirtchovski
2012-04-26 1:24 ` andy zerger
2012-04-26 1:49 ` John Floren
2012-04-26 3:41 ` Strake
2012-04-25 19:19 ` Lyndon Nerenberg
2012-04-25 20:01 ` Strake
2012-04-25 20:05 ` Gorka Guardiola
2012-04-25 20:08 ` Lyndon Nerenberg
[not found] ` <CAL3m8eCJughpHZ6htHyLyq9vORA+z5ajpWMbWjnCTVZ+YZRv9g@mail.gmail.c>
2012-04-25 19:36 ` erik quanstrom
[not found] ` <CA+4OWrwGgkYfuj2t4dkWsZHFex4oFTveDq_9A+yr=TsNpG0C8g@mail.gmail.c>
2012-04-25 18:56 ` erik quanstrom
2012-04-25 19:16 ` Strake
[not found] ` <CAL3m8eDJEo6o+srxuYpKSGDmM+0KgQhC15u7Qxg4TvnpO57Zgw@mail.gmail.c>
2012-04-25 19:32 ` erik quanstrom
2012-04-25 20:13 ` Strake
2012-04-25 20:20 ` Lyndon Nerenberg
2012-04-26 3:38 ` Russ Cox
2012-04-26 4:04 ` Devon H. O'Dell
2012-04-26 4:13 ` andrey mirtchovski
2012-04-26 4:36 ` Strake
2012-05-05 15:02 ` Ethan Grammatikidis
2012-05-05 15:33 ` [9fans] integer width on AMD64 (was: Re: AMD64 system) dexen deVries
2012-05-05 16:41 ` David du Colombier
2012-05-05 17:42 ` erik quanstrom
2012-05-05 17:48 ` Charles Forsyth
2012-05-05 17:52 ` dexen deVries
2012-05-05 21:06 ` Comeau At9Fans
2012-05-06 2:58 ` [9fans] integer width on AMD64 Joel C. Salomon
2012-05-06 3:13 ` Bruce Ellis
2012-05-06 8:46 ` Comeau At9Fans
[not found] ` <CAE9W7-gmaSYzx+4TK0LKtiHaZYC-4xz_DTbC_wqhsGo_7zXc0Q@mail.gmail.c>
2012-05-06 13:10 ` erik quanstrom
2012-05-06 13:57 ` Comeau At9Fans
2012-05-06 9:20 ` [9fans] integer width on AMD64 (was: Re: AMD64 system) steve
2012-05-06 11:43 ` Comeau At9Fans
2012-05-07 8:53 ` steve
2012-05-07 10:01 ` dexen deVries
2012-05-07 10:16 ` Charles Forsyth
2012-05-07 10:27 ` Charles Forsyth
2012-05-07 10:36 ` dexen deVries
2012-05-08 19:04 ` Comeau At9Fans
[not found] ` <CAOw7k5h9QVUCrKr4jYU++sSWE6DHqbA_oFRwajyKbj7A0AjBWg@mail.gmail.c>
2012-05-07 12:11 ` erik quanstrom
2012-05-07 12:32 ` erik quanstrom
2012-05-07 12:44 ` erik quanstrom
2012-05-08 19:14 ` Comeau At9Fans
2012-05-05 21:00 ` Comeau At9Fans [this message]
[not found] ` <CAL3m8eDMXC2STjFjBUurmdY5DynCOrpqwE-ViRuSubfF6HjBOw@mail.gmail.c>
2012-04-25 18:11 ` [9fans] AMD64 system erik quanstrom
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