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From: "Nick Roberts" <Nick.Roberts@dial.pipex.com>
Subject: Re: should I be interested in ada?
Date: 1999/02/23
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References: <7a72e6$g55$1@probity.mcc.ac.uk> <36C93BB4.1429@ecs.soton.ac.uk>
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 <7ai502$6an$1@nnrp1.dejanews.com> <36CD8DBA.237C@lanl.gov>
 <7akvao$j5t$2@plug.news.pipex.net> <7aldu1$4q$1@nnrp1.dejanews.com>
 <7aslfp$gpq$1@plug.news.pipex.net> <7atdf0$gu6$1@nnrp1.dejanews.com>
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Date: 1999-02-23T00:00:00+00:00
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robert_dewar@my-dejanews.com wrote in message
<7atdf0$gu6$1@nnrp1.dejanews.com>...
[...]
|but there is nothing in it
|to suggest that the kind of parellelism you suggest is
|possible. For example:
|
|   for all J in 1 .. N loop
|     S := S + D(J);
|   end loop;
|
|The FOR ALL here implies that the additions can be done
|in any order. If we write the above loop without the ALL,
|there is ABSOLUTELY no permission anywhere in the RM
|(including in 11.6(6) that would allow the additions to
|be done in other than the canonical order). Note that
|the model interval of the result can of course be changed
|by changing the order of additions!
|
|There are many other similar examples
[...]


Is this a wind up? How about section 1.1.3, which states that "the execution
of an Ada program is defined in terms of its interactions with the external
environment"? Only conformance with Annex G (in 'strict mode') causes 'model
intervals' to be a restriction on optimisations. The Fortran 90 standard has
no such strictures (even as an option), and it doesn't offer a fixed-point
type. Be serious, please.

-------------------------------------
Nick Roberts
-------------------------------------