From: "DuckE" <nospam_steved94@home.com>
Subject: Re: gnat/ppc and a32 blt transfers
Date: Thu, 02 Nov 2000 04:55:36 GMT
Date: 2000-11-02T04:55:36+00:00 [thread overview]
Message-ID: <ct6M5.42679$E85.1088500@news1.sttls1.wa.home.com> (raw)
In-Reply-To: 8tpvpl$ige$1@nnrp1.deja.com
Should't
pragma Atomic( variable );
cause accesses to a variable to be performed as a single operation?
While I would not expect this to work for the component of a packed boolean
array, since element is not individually addessable (on most
architectures), I would expect this functionality using types that are
individually addressable.
For example, on an architecture where integers are 32 bit values I would
expect the following declarations:
memValue : Integer;
FOR memValue'ADDRESS USE
System.Storage_Elements.To_Address( 16#FFFE0000# );
PRAGMA Atomic( memValue );
To generate code that uses 32 bit accesses to memValue.
Since GNAT supports Annex C, and this behaviour is described in C.6.15, I
would expect this behavior.
Am I missing something?
SteveD
next prev parent reply other threads:[~2000-11-02 4:55 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-01 19:47 gnat/ppc and a32 blt transfers Al Johnston
2000-11-01 20:52 ` Robert Dewar
2000-11-02 4:55 ` DuckE [this message]
2000-11-02 14:26 ` Robert A Duff
2000-11-02 19:58 ` Al Johnston
2000-11-04 5:02 ` Robert Dewar
2000-11-04 0:00 ` David Starner
2000-11-06 0:00 ` Robert Dewar
2000-11-11 6:38 ` David Thompson
2000-11-06 7:39 ` tmoran
2000-11-04 0:00 ` Al Johnston
2000-11-05 0:00 ` Florian Weimer
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