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Groups > comp.lang.c > #153819
| From | Keith Thompson <Keith.S.Thompson+u@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: widening multiplication |
| Date | 2020-08-21 11:04 -0700 |
| Organization | None to speak of |
| Message-ID | <87blj398p6.fsf@nosuchdomain.example.com> (permalink) |
| References | (16 earlier) <6bd1b70e-e118-4570-91dd-01cbceb8fb15n@googlegroups.com> <87k0xs6zy7.fsf@bsb.me.uk> <93O%G.1158422$QC4.953247@fx19.am4> <rhobk2$2np$1@dont-email.me> <aWO%G.1104153$e15.483411@fx24.am4> |
Bart <bc@freeuk.com> writes:
> On 21/08/2020 12:36, David Brown wrote:
>> On 21/08/2020 13:17, Bart wrote:
>>> They also use the x64 multiply that does i64*i64->i64, not the less
>>> flexible and less efficient i64*64->i128, so that conflict, trying not
>>> to waste the extra precision, doesn't arise.)
>>
>> Fair enough. For many purposes on modern systems, there are advantages
>> in simply saying "all integers for calculations are 64-bit". You might
>> want smaller types for efficient storage in arrays, or for foreign
>> function interfaces.
>
> There's no conflict here.
>
> You can have a default int type of 64 bits, and specify that all terms
> are widened to at least 64 bits for calculations, and yet still have
> 8, 16 and 32-bit types for use inside arrays, structs and as pointer
> targets. (Or, if you want, as standalone variables or parameter
> types.)
>
> Pretty much as C does, except it uses 32 bits as the base width
> (ignoring the arcane rules on mixing signed and unsigned).
Or whatever size int happens to be for a given implementation.
--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */
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widening multiplication jacobnavia <jacob@jacob.remcomp.fr> - 2020-08-17 22:11 +0200
Re: widening multiplication Eric Sosman <esosman@comcast-dot-net.invalid> - 2020-08-17 16:30 -0400
Re: widening multiplication jacobnavia <jacob@jacob.remcomp.fr> - 2020-08-18 09:27 +0200
Re: widening multiplication Andrey Tarasevich <andreytarasevich@hotmail.com> - 2020-08-17 13:33 -0700
Re: widening multiplication jacobnavia <jacob@jacob.remcomp.fr> - 2020-08-18 09:24 +0200
Re: widening multiplication Andrey Tarasevich <andreytarasevich@hotmail.com> - 2020-08-21 14:47 -0700
Re: widening multiplication Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-08-17 21:52 +0100
Re: widening multiplication jacobnavia <jacob@jacob.remcomp.fr> - 2020-08-18 09:22 +0200
Re: widening multiplication Siri Cruise <chine.bleu@yahoo.com> - 2020-08-17 14:10 -0700
Re: widening multiplication Bart <bc@freeuk.com> - 2020-08-17 22:33 +0100
Re: widening multiplication Siri Cruise <chine.bleu@yahoo.com> - 2020-08-17 15:13 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-18 11:33 +0200
Re: widening multiplication jacobnavia <jacob@jacob.remcomp.fr> - 2020-08-18 09:20 +0200
Re: widening multiplication scott@slp53.sl.home (Scott Lurndal) - 2020-08-17 21:38 +0000
Re: widening multiplication jacobnavia <jacob@jacob.remcomp.fr> - 2020-08-18 09:19 +0200
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-18 11:31 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-18 05:00 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-18 15:10 +0200
Re: widening multiplication Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-08-18 12:31 +0000
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-18 15:15 +0200
Re: widening multiplication Siri Cruise <chine.bleu@yahoo.com> - 2020-08-18 06:53 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-18 16:14 +0200
Re: widening multiplication Siri Cruise <chine.bleu@yahoo.com> - 2020-08-18 07:24 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-18 22:41 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-18 14:24 -0700
Re: widening multiplication Bart <bc@freeuk.com> - 2020-08-18 22:54 +0100
Re: widening multiplication Siri Cruise <chine.bleu@yahoo.com> - 2020-08-18 15:18 -0700
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-18 15:54 -0700
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-18 15:38 -0700
Re: widening multiplication Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-08-19 07:03 +0000
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-19 09:24 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-19 02:13 -0700
Re: widening multiplication Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-08-19 10:43 +0000
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-19 12:50 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-19 07:30 -0700
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-19 07:44 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-19 17:35 +0200
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-19 10:13 -0700
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-19 14:30 -0700
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-19 15:07 -0700
Re: widening multiplication Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-08-19 22:13 +0000
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-19 15:49 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-20 11:31 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-20 03:47 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-20 13:21 +0200
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-20 08:20 -0400
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-21 09:51 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-21 02:51 -0700
Re: widening multiplication Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-08-21 11:44 +0100
Re: widening multiplication Bart <bc@freeuk.com> - 2020-08-21 12:17 +0100
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-21 13:36 +0200
Re: widening multiplication Bart <bc@freeuk.com> - 2020-08-21 13:15 +0100
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-21 11:04 -0700
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-21 08:30 -0400
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-21 13:32 +0200
Re: widening multiplication Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-08-21 12:46 +0100
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-21 07:43 -0700
Re: widening multiplication Bart <bc@freeuk.com> - 2020-08-21 16:13 +0100
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-21 20:15 +0200
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-21 20:14 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-21 16:37 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-22 15:38 +0200
Re: widening multiplication Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-08-22 01:02 +0100
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-22 04:57 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-22 16:11 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-22 08:46 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-22 18:33 +0200
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-22 13:44 -0400
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-22 12:48 -0700
Re: widening multiplication Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-08-22 21:45 +0100
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-22 05:20 -0700
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-22 10:16 -0400
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-22 08:59 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-22 19:04 +0200
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-22 13:59 -0400
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-22 23:01 +0200
Re: widening multiplication Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-08-23 07:42 -0700
Re: widening multiplication Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-08-22 22:12 +0100
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-23 13:31 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-23 04:53 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-23 14:22 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-23 06:47 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-23 16:25 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-23 07:42 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-24 09:10 +0200
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-24 02:06 -0700
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-23 13:10 -0400
Re: widening multiplication Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-08-23 16:16 +0100
Re: widening multiplication Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-08-22 22:02 +0100
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-22 18:14 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-23 14:27 +0200
Re: widening multiplication James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-08-21 05:58 -0700
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-19 19:15 -0400
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-19 16:48 -0700
Re: widening multiplication Bart <bc@freeuk.com> - 2020-08-19 23:39 +0100
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-19 15:51 -0700
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-19 15:56 -0700
Re: widening multiplication Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2020-08-19 16:04 -0700
Re: widening multiplication Siri Cruise <chine.bleu@yahoo.com> - 2020-08-19 18:04 -0700
Re: widening multiplication antispam@math.uni.wroc.pl - 2020-08-20 00:13 +0000
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-20 10:06 +0200
Re: widening multiplication Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2020-08-20 11:26 +0200
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-20 13:25 +0200
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-19 07:41 -0400
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-19 15:08 +0200
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-19 10:29 -0400
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-19 17:41 +0200
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-19 13:34 -0400
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-19 20:21 +0200
Re: widening multiplication Siri Cruise <chine.bleu@yahoo.com> - 2020-08-18 15:16 -0700
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-19 09:32 +0200
Re: widening multiplication James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-08-18 11:11 -0400
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-18 22:45 +0200
Re: widening multiplication Daniel Hyde <Daniel.Hyde71@gmail.com> - 2020-08-19 20:17 +0200
Re: widening multiplication James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-08-19 15:20 -0400
Re: widening multiplication Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-08-19 20:59 +0000
Re: widening multiplication James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-08-19 17:28 -0400
Re: widening multiplication Bart <bc@freeuk.com> - 2020-08-19 22:43 +0100
Re: widening multiplication Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2020-08-19 21:38 +0200
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-19 21:47 +0200
Re: widening multiplication Daniel Hyde <Daniel.Hyde71@gmail.com> - 2020-08-20 12:24 +0200
Re: widening multiplication James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-08-20 08:14 -0400
Re: widening multiplication Daniel Hyde <Daniel.Hyde71@gmail.com> - 2020-08-20 14:20 +0200
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-20 10:39 -0700
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-19 15:55 -0400
Re: widening multiplication Daniel Hyde <Daniel.Hyde71@gmail.com> - 2020-08-22 12:30 +0200
Re: widening multiplication James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-08-22 05:09 -0700
Re: widening multiplication Daniel Hyde <Daniel.Hyde71@gmail.com> - 2020-08-22 17:15 +0200
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-22 19:06 +0200
Re: widening multiplication Richard Harnden <richard.nospam@gmail.com> - 2020-08-22 19:06 +0100
Re: widening multiplication Bonita Montero <Bonita.Montero@gmail.com> - 2020-08-22 20:28 +0200
Re: widening multiplication Bonita Montero <Bonita.Montero@gmail.com> - 2020-08-23 01:36 +0200
Re: widening multiplication "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-08-22 18:15 -0700
Re: widening multiplication Bonita Montero <Bonita.Montero@gmail.com> - 2020-08-23 11:16 +0200
Re: widening multiplication "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-08-23 21:05 -0700
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-22 12:45 -0700
Re: widening multiplication James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-08-22 11:47 -0700
Re: widening multiplication Richard Damon <Richard@Damon-Family.org> - 2020-08-22 10:21 -0400
Re: widening multiplication Bart <bc@freeuk.com> - 2020-08-22 16:18 +0100
Re: widening multiplication David Brown <david.brown@hesbynett.no> - 2020-08-22 19:16 +0200
Re: widening multiplication Kaz Kylheku <793-849-0957@kylheku.com> - 2020-08-23 04:38 +0000
Re: widening multiplication James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-08-23 08:22 -0400
Re: widening multiplication Kaz Kylheku <793-849-0957@kylheku.com> - 2020-08-24 03:00 +0000
Re: widening multiplication James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-08-23 23:54 -0400
Re: widening multiplication Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-08-24 06:19 +0000
Re: widening multiplication James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-08-24 09:45 -0400
Re: widening multiplication Kaz Kylheku <793-849-0957@kylheku.com> - 2020-08-24 14:47 +0000
Re: widening multiplication "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2020-08-24 12:14 -0700
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-24 08:40 -0700
Re: widening multiplication Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-08-26 18:06 +0000
Re: widening multiplication Daniel Hyde <Daniel.Hyde71@gmail.com> - 2020-08-23 17:55 +0200
Re: widening multiplication Bart <bc@freeuk.com> - 2020-08-23 17:38 +0100
Re: widening multiplication Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-19 13:15 -0700
Re: widening multiplication rick.c.hodgin@gmail.com - 2020-08-23 08:03 -0700
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