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Date: Fri, 15 Nov 2013 20:25:28 +0100
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: GNAT 4.8 atomic access to 64-bit objects
References: <1neco99j6szmk$.ayjyo0uds8a5.dlg@40tude.net>
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Date: 2013-11-15T20:25:27+01:00
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On 15.11.13 09:44, Dmitry A. Kazakov wrote:
> On Thu, 14 Nov 2013 21:34:26 +0100, Ludovic Brenta wrote:

>> I'd suggest you use 64-bit floating-point registers instead; i386
>> processors have them, I think.  That has been a useful trick for a
>> decade or so :)
>
> Using unchecked union or unchecked conversion?

FTR, a different 32 bit implementation (Ada 95) does not support a binary
modulus of 64, and also, while Unchecked_Conversion passes the value 42
from an integer register to a FPT register and back as 42, idly trying
   type Fake is new  Long_Float;
   pragma Atomic (Fake);
gives
  LRM:C.6(10), Indivisible read/update not supported for given subtype, pragma Atomic ignored