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Groups > comp.lang.c > #107594
| From | Keith Thompson <kst-u@mib.org> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: struct padding question |
| Date | 2017-04-01 11:43 -0700 |
| Organization | None to speak of |
| Message-ID | <lno9wg2ckh.fsf@kst-u.example.com> (permalink) |
| References | <ob062g$coi$1@dont-email.me> <ob07qd$if0$1@dont-email.me> <obon1p$4aj$1@dont-email.me> |
Noob <root@127.0.0.1> writes:
> On 23/03/2017 11:28, David Brown wrote:
>> struct data {
>> uint64_t ctr[6]; // 8-byte alignment, 8x6 data
>> long double mean; // 16-byte alignment, 16-byte data
>> long double variance; // 16-byte alignment, 16-byte data
>> long double * p_ptr; // 8-byte alignment, 8-byte data
>>
>> // inserted by compiler...
>> uint64_t padding; // 8-byte alignment, 8-byte data
>> };
>
> I think some platforms have sizeof(long double) = 10?
> (I have x86 in mind, with the 80-bit FP numbers.)
The only values for sizeof (long double) I've seen are 8, 12, and 16.
Some implementations might pad a 10-byte long double to 12 bytes.
(Of course I haven't seen all implementations.)
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
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struct padding question MehdiAmini <atorrses@gmail.com> - 2017-03-23 14:28 +0430
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 11:28 +0100
Re: struct padding question MehdiAmini <atorrses@gmail.com> - 2017-03-23 16:44 +0430
Re: struct padding question jm.bourguet@gmail.com - 2017-03-23 05:30 -0700
Re: struct padding question Keith Thompson <kst-u@mib.org> - 2017-03-23 08:45 -0700
Re: struct padding question Noob <root@127.0.0.1> - 2017-04-01 19:15 +0200
Re: struct padding question tim prince <n8tm@aol.com> - 2017-04-01 14:41 -0400
Re: struct padding question supercat@casperkitty.com - 2017-04-02 09:15 -0700
Re: struct padding question scott@slp53.sl.home (Scott Lurndal) - 2017-04-03 13:51 +0000
Re: struct padding question supercat@casperkitty.com - 2017-04-03 07:48 -0700
Re: struct padding question scott@slp53.sl.home (Scott Lurndal) - 2017-04-03 15:47 +0000
Re: struct padding question supercat@casperkitty.com - 2017-04-03 09:24 -0700
Re: struct padding question Keith Thompson <kst-u@mib.org> - 2017-04-01 11:43 -0700
Re: struct padding question Robert Wessel <robertwessel2@yahoo.com> - 2017-04-01 13:46 -0500
Re: struct padding question Keith Thompson <kst-u@mib.org> - 2017-04-01 12:00 -0700
Re: struct padding question Robert Wessel <robertwessel2@yahoo.com> - 2017-04-01 16:40 -0500
Re: struct padding question Keith Thompson <kst-u@mib.org> - 2017-04-01 15:24 -0700
Re: struct padding question Robert Wessel <robertwessel2@yahoo.com> - 2017-04-03 17:46 -0500
Re: struct padding question BartC <bc@freeuk.com> - 2017-03-23 11:50 +0000
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 14:08 +0100
Re: struct padding question BartC <bc@freeuk.com> - 2017-03-23 13:31 +0000
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 14:46 +0100
Re: struct padding question BartC <bc@freeuk.com> - 2017-03-23 14:07 +0000
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 15:52 +0100
Re: struct padding question scott@slp53.sl.home (Scott Lurndal) - 2017-03-23 17:19 +0000
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 19:57 +0100
Re: struct padding question Ian Pilcher <arequipeno@gmail.com> - 2017-03-23 08:52 -0500
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 15:54 +0100
Re: struct padding question supercat@casperkitty.com - 2017-03-23 08:29 -0700
Re: struct padding question GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-23 14:04 +0100
Re: struct padding question MehdiAmini <atorrses@gmail.com> - 2017-03-23 20:32 +0430
Re: struct padding question GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-23 18:35 +0100
Re: struct padding question supercat@casperkitty.com - 2017-03-23 12:02 -0700
Re: struct padding question Keith Thompson <kst-u@mib.org> - 2017-03-23 12:21 -0700
Re: struct padding question supercat@casperkitty.com - 2017-03-23 12:55 -0700
Re: struct padding question Les Cargill <lcargill99@comcast.com> - 2017-03-25 15:12 -0500
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