From: Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP>
Subject: Re: Forcing GNAT to use 32-bit load/store instructions on ARM?
Date: Tue, 1 Jul 2014 17:26:55 +0000 (UTC)
Date: 2014-07-01T17:26:55+00:00 [thread overview]
Message-ID: <lour0v$naa$1@dont-email.me> (raw)
In-Reply-To: c1g3aoF4gnnU1@mid.individual.net
On 2014-07-01, Niklas Holsti <niklas.holsti@tidorum.invalid> wrote:
> On 14-07-01 15:06 , Simon Clubley wrote:
>> On 2014-06-30, Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org> wrote:
>>> On 06/30/2014 03:11 PM, daniel.dmk@googlemail.com wrote:
>>>>
>>>> Does anyone know how I can force GNAT to generate the appropriate
>>>> instructions?
>>>
>>> If you need specific machine instructions, you should use a machine-code insertion.
>>>
>>
>> The issue here is that Pragma Atomic should have given him the guarantee
>> he needs.
>
> Perhaps pragma Atomic did not work because the record actually had only
> 2 significant bits, fitting in one octet, and the Size = 32 bits clause
> did not make GNAT treat all 32 bits as atomic? I'm not sure if that
> would be a bug -- does a Size clause determine the extent of pragma Atomic?
>
I suppose it's possible, but then again according to the OP it did work
when using a temporary record.
> The OP should try to add components to fill all 32 bits, and also use
> pragma Atomic. If that doesn't work, then it is a GNAT bug, methinks.
>
Filling out to 32-bits would be an interesting test (and allows the OP
to set them to a known value if performing a simple 32-bit store instead
of a R/M/W operation.)
Simon.
--
Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP
Microsoft: Bringing you 1980s technology to a 21st century world
next prev parent reply other threads:[~2014-07-01 17:26 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-30 22:11 Forcing GNAT to use 32-bit load/store instructions on ARM? daniel.dmk
2014-06-30 23:41 ` Jeffrey Carter
2014-07-01 12:06 ` Simon Clubley
2014-07-01 15:44 ` Niklas Holsti
2014-07-01 17:26 ` Simon Clubley [this message]
2014-07-01 17:18 ` Simon Wright
2014-07-01 19:43 ` Simon Wright
2014-07-01 17:28 ` Jeffrey Carter
2014-07-01 0:55 ` anon
2014-07-01 4:30 ` Niklas Holsti
2014-07-01 8:11 ` Dmitry A. Kazakov
2014-07-01 12:09 ` Simon Clubley
2014-07-01 12:20 ` Dmitry A. Kazakov
2014-07-01 17:00 ` Simon Clubley
2014-07-01 19:36 ` Dmitry A. Kazakov
2014-07-01 20:08 ` Simon Clubley
2014-07-02 22:24 ` Randy Brukardt
2014-07-06 20:40 ` MatthiasR
2014-07-07 0:25 ` Simon Clubley
2014-07-07 22:38 ` Randy Brukardt
2014-07-08 6:51 ` Simon Wright
2014-07-10 11:47 ` Simon Wright
2014-07-10 13:06 ` Simon Clubley
2014-07-11 18:05 ` Simon Wright
2014-07-11 20:22 ` Simon Clubley
2014-07-08 8:50 ` Brian Drummond
2014-07-08 12:12 ` Simon Clubley
2014-07-08 13:26 ` G.B.
2014-07-08 17:13 ` Simon Clubley
2014-07-08 15:36 ` Adam Beneschan
2014-07-08 15:40 ` Adam Beneschan
2014-07-08 20:34 ` Randy Brukardt
2014-07-09 7:31 ` Dmitry A. Kazakov
2014-07-10 0:11 ` Simon Clubley
2014-07-20 11:35 ` MatthiasR
2014-07-20 15:49 ` Simon Clubley
2014-07-26 11:05 ` MatthiasR
2014-08-10 11:20 ` MatthiasR
2014-07-01 12:03 ` Simon Clubley
2014-07-01 19:52 ` daniel.dmk
2014-07-01 20:40 ` Simon Clubley
2014-07-01 20:55 ` Simon Clubley
2014-07-01 21:01 ` Niklas Holsti
2014-07-01 21:20 ` Simon Clubley
2014-07-01 22:38 ` Niklas Holsti
2014-07-02 16:49 ` Simon Clubley
2014-07-01 21:55 ` daniel.dmk
2014-07-02 7:30 ` Simon Wright
2014-07-02 18:52 ` daniel.dmk
2014-07-04 23:51 ` Niklas Holsti
2014-07-05 0:18 ` Niklas Holsti
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