From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: getting same output as gfortran, long_float
Date: Mon, 4 May 2015 09:21:31 +0200
Date: 2015-05-04T09:21:31+02:00 [thread overview]
Message-ID: <1clezdvkle213$.z5pl2xkhti8a$.dlg@40tude.net> (raw)
In-Reply-To: a2331d9f-e194-4cd4-a42e-28a3b00a9c08@googlegroups.com
On Sun, 3 May 2015 17:15:15 -0700 (PDT), robin.vowels@gmail.com wrote:
> On Friday, May 1, 2015 at 5:45:23 PM UTC+10, Dmitry A. Kazakov wrote:
>> Actually REAL*16 is exactly portable.
>
> No it's not.
> Some compilers treat that is an error.
Portability applies to compilable programs only. You could not compile
type X is mod 2**64;
either. That does not make it non-portable, IMO.
Portable means: The program exposes same [logically relevant] behavior on
all platforms [of interest].
A program that does not compile on a platform of interest is just an
illegal program. It is neither portable or non-portable. We don't know yet.
> That form is non-standard.
Maybe. Though "FORTRAN" and "standard" sound silly in the same context.
> SELECTED_REAL_KIND or a similar modern form is how
> precision may be specified in a portable manner.
Maybe, but not for the reason of being standard or compilable. The point
was about specifying precision [and accuracy] in the problem space terms
rather than in machine-specific ones.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2015-05-04 7:21 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-30 21:17 getting same output as gfortran, long_float Nasser M. Abbasi
2015-04-30 22:08 ` Dmitry A. Kazakov
2015-04-30 22:11 ` Dmitry A. Kazakov
2015-04-30 22:37 ` Nasser M. Abbasi
2015-04-30 22:53 ` Nasser M. Abbasi
2015-05-01 7:22 ` Jacob Sparre Andersen
2015-05-01 1:12 ` Nasser M. Abbasi
2015-05-01 6:52 ` Dmitry A. Kazakov
2015-05-01 7:32 ` Nasser M. Abbasi
2015-05-01 7:45 ` Dmitry A. Kazakov
2015-05-04 0:15 ` robin.vowels
2015-05-04 7:21 ` Dmitry A. Kazakov [this message]
2015-05-04 8:53 ` robin.vowels
2015-05-04 10:18 ` Dmitry A. Kazakov
2015-05-04 13:45 ` robin.vowels
2015-05-04 14:47 ` Dmitry A. Kazakov
2015-05-07 2:01 ` robin.vowels
2015-05-01 23:24 ` Dennis Lee Bieber
2015-05-04 0:09 ` robin.vowels
2015-05-01 7:01 ` Dmitry A. Kazakov
2015-05-04 0:42 ` robin.vowels
2015-04-30 22:12 ` Jeffrey R. Carter
2015-04-30 22:27 ` Qun-Ying
2015-05-01 0:59 ` Dennis Lee Bieber
2015-04-30 22:32 ` Nasser M. Abbasi
2015-05-01 1:16 ` Jeffrey R. Carter
2015-05-01 1:40 ` Nasser M. Abbasi
2015-05-01 7:47 ` Jacob Sparre Andersen
2015-05-01 15:39 ` Waldek Hebisch
2015-05-01 17:27 ` Nasser M. Abbasi
2015-05-01 18:03 ` Nasser M. Abbasi
2015-05-04 0:51 ` robin.vowels
2015-05-04 0:47 ` robin.vowels
2015-05-01 8:21 ` Simon Wright
2015-05-01 11:55 ` Georg Bauhaus
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