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Premature optimization is the root of all evil. -- D. E. Knuth

devel / comp.lang.fortran / Re: Deallocate problem

SubjectAuthor
* Deallocate problemdb
+- Re: Deallocate problemJohn
+* Re: Deallocate problemRobin Vowels
|`* Re: Deallocate problemdb
| +- Re: Deallocate problemgah4
| `* Re: Deallocate problemRobin Vowels
|  `* Re: Deallocate problemdb
|   +* Re: Deallocate problemRon Shepard
|   |`* Re: Deallocate problemgah4
|   | `* Re: Deallocate problemRobin Vowels
|   |  `* Re: Deallocate problemjfh
|   |   +- Re: Deallocate problemgah4
|   |   `* Re: Deallocate problemRobin Vowels
|   |    +* Re: Deallocate problemRon Shepard
|   |    |+- Re: Deallocate problemGary Scott
|   |    |`* Re: Deallocate problemRobin Vowels
|   |    | `* Re: Deallocate problemjfh
|   |    |  `* Re: Deallocate problemgah4
|   |    |   `* Re: Deallocate problemThomas Koenig
|   |    |    `- Re: Deallocate problemRobin Vowels
|   |    +* Re: Deallocate problemjfh
|   |    |`- Re: Deallocate problemjfh
|   |    `- Re: Deallocate problemgah4
|   `* Re: Deallocate problemLouis Krupp
|    `* Re: Deallocate problemdb
|     `- Re: Deallocate problemLouis Krupp
+- Re: Deallocate problemFortranFan
`- Re: Deallocate problemLouis Krupp

Pages:12
Re: Deallocate problem

<19581186-83ad-4dbf-8ee0-e22d62cd5a23n@googlegroups.com>

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Subject: Re: Deallocate problem
From: gah4@u.washington.edu (gah4)
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 by: gah4 - Mon, 19 Sep 2022 16:34 UTC

On Sunday, September 18, 2022 at 10:43:36 PM UTC-7, jfh wrote:

(snip)

> I was not surprised that all three of those compilers print 127 four
> times with this program, and they are standard-conforming in that
> respect because none of those compilers has a 4-bit integer type.
> My revised 4-line program:
> integer, parameter:: ineg = selected_int_kind(-1), i0 = selected_int_kind(0),&
> i1 = selected_int_kind(1), i2 = selected_int_kind(2)
> print *, huge(0_ineg),huge(0_i0),huge(0_i1),huge(0_i2)
> end program

And especially that allows, in case anyone implemented it, a 4 bit type
that would not allow for selected_int_kind(1).

It would be nice to have a selector that allowed selecting the base
of the computation. (Not necessarily the base of the selected type.)

There could be machines with types that could not be distinguished
by whole decimal digits.

Re: Deallocate problem

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From: tkoenig@netcologne.de (Thomas Koenig)
Newsgroups: comp.lang.fortran
Subject: Re: Deallocate problem
Date: Tue, 20 Sep 2022 05:32:39 -0000 (UTC)
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 by: Thomas Koenig - Tue, 20 Sep 2022 05:32 UTC

gah4 <gah4@u.washington.edu> schrieb:
> On Sunday, September 18, 2022 at 10:43:36 PM UTC-7, jfh wrote:
>
> (snip)
>
>> I was not surprised that all three of those compilers print 127 four
>> times with this program, and they are standard-conforming in that
>> respect because none of those compilers has a 4-bit integer type.
>> My revised 4-line program:
>
>> integer, parameter:: ineg = selected_int_kind(-1), i0 = selected_int_kind(0),&
>> i1 = selected_int_kind(1), i2 = selected_int_kind(2)
>> print *, huge(0_ineg),huge(0_i0),huge(0_i1),huge(0_i2)
>> end program
>
> And especially that allows, in case anyone implemented it, a 4 bit type
> that would not allow for selected_int_kind(1).
>
> It would be nice to have a selector that allowed selecting the base
> of the computation. (Not necessarily the base of the selected type.)

For real types, you can select the radix with the corresponding
argument to SELECTED_REAL_KIND, if the hardware allows for it.
I suppose this is for decimal floats.

> There could be machines with types that could not be distinguished
> by whole decimal digits.

Real or complex arguments to SELECTED_INT_KIND, anybody? A base
of 2i sounds really promising (and Knuth proposed it, so it
must be good :-)

Re: Deallocate problem

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Subject: Re: Deallocate problem
From: robin.vowels@gmail.com (Robin Vowels)
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 by: Robin Vowels - Tue, 20 Sep 2022 06:43 UTC

On Tuesday, September 20, 2022 at 3:32:42 PM UTC+10, Thomas Koenig wrote:
> gah4 <ga...@u.washington.edu> schrieb:
> > On Sunday, September 18, 2022 at 10:43:36 PM UTC-7, jfh wrote:
> >
> > (snip)
> >
> >> I was not surprised that all three of those compilers print 127 four
> >> times with this program, and they are standard-conforming in that
> >> respect because none of those compilers has a 4-bit integer type.
> >> My revised 4-line program:
> >
> >> integer, parameter:: ineg = selected_int_kind(-1), i0 = selected_int_kind(0),&
> >> i1 = selected_int_kind(1), i2 = selected_int_kind(2)
> >> print *, huge(0_ineg),huge(0_i0),huge(0_i1),huge(0_i2)
> >> end program
> >
> > And especially that allows, in case anyone implemented it, a 4 bit type
> > that would not allow for selected_int_kind(1).
> >
> > It would be nice to have a selector that allowed selecting the base
> > of the computation. (Not necessarily the base of the selected type.)
> For real types, you can select the radix with the corresponding
> argument to SELECTED_REAL_KIND, if the hardware allows for it.
> I suppose this is for decimal floats.
> > There could be machines with types that could not be distinguished
> > by whole decimal digits.
> Real or complex arguments to SELECTED_INT_KIND, anybody?
..
PL/I has had COMPLEX integer (as well as COMPLEX FLOAT)
SINCE 1966.

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