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From: Corey Ashford <yeroca@rocketmail.com>
Subject: Re: Question for the folks who designed Ada95
Date: 1999/04/29
Message-ID: <3727EC39.E460C803@rocketmail.com>#1/1
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Date: 1999-04-29T00:00:00+00:00
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Robert Dewar wrote:
> 
> In article <3726A2B1.5793E3BE@rocketmail.com>,
>   Corey Ashford <yeroca@rocketmail.com> wrote:
> > I tried out this technique, by the way, on Apex.  Works
> > like a champ and inlines exactly as you said.
> 
> Note that there is no requirement at all that this work,
> but it is not surprising to find that it would work
> (accidentally? is it documented, I am not sure that it
> is properly documented for GNAT either come to think
> about it) since it is an obvious way of implementing
> things.
> 
> All the more reason for the ARG to insist on it.
> 
> There are issues of what types it can be applied to. Shift
> operations applied for example to non-binary modular types
> are quite a puzzle.
> 
> In GNAT, we allow shifts to be applied to any signed or
> binary unsigned integer type whose size is 8, 16, 32, or
> 64 (i.e. natural machine sizes for which shifts make
> sense).
> 
> It would be interesting to know what restrictions other
> compilers impose on this usage.
> 
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It seems to me that the way to handle it is the way
"and", "or", etc, were dealt with on non power-of-two modular
types.  That is, do the operation, then do a mod operation
afterward.

I haven't tried a non power-of-two pragma import(intrinsic, ...)
yet.  I'll try it and let you know what happens.

- Corey