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n...@cam.ac.uk  
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 More options Jan 29 2009, 3:51 pm
Newsgroups: comp.lang.fortran
From: n...@cam.ac.uk
Date: Thu, 29 Jan 2009 20:51:37 +0000 (GMT)
Local: Thurs, Jan 29 2009 3:51 pm
Subject: Re: how to declare doubles in f95
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In article <glt48a$ai...@naig.caltech.edu>,
glen herrmannsfeldt  <g...@ugcs.caltech.edu> wrote:

>Richard Maine <nos...@see.signature> wrote:

>> It became common practice for compilers for other machines to have at
>> least an option to make single precision be 64 bits in order to
>> facilitate porting of such code. It is such a common option that people
>> today continue using those options and writing code that assumes single
>> precision is 64 bits, even if they have never seen anything like a CDC.
>> To my knowledge, a majority, or at least a large fraction, of today's
>> compilers have such options. Questions relating to this come up quite
>> regularly on this newsgroup.

>I don't remember that option on the IBM compilers, other than adding

>      IMPLICIT REAL*8 (A-H,O-$)

>which I did see many times.  ($ was the 27th letter of the alphabet.)
>(As far as I know, IBM started the use of IMPLICIT, maybe for this.)

>Also, there were many routines with sets of declarations and
>DATA statements at the beginning where you uncomment the ones
>appropriate for your machine.

It was called AUTODBL.  If I recall (and I may well not), it was not
present in IBM's original development compilers for the System/360
(Code-and-go and G), and may not have been even in the Program Product,
G1.  I think I have enough old manuals to check ....

Anyway, it was a crock.

Regards,
Nick Maclaren.


 
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