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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Forcing GNAT to use 32-bit load/store instructions on ARM?
Date: Tue, 1 Jul 2014 10:11:11 +0200
Organization: cbb software GmbH
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Date: 2014-07-01T10:11:11+02:00
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On Mon, 30 Jun 2014 15:11:31 -0700 (PDT), daniel.dmk@googlemail.com wrote:

> I've started using GNAT GPL for ARM (hosted on Windows) and I'm working on
> some code in SPARK 2014 to interface to memory-mapped registers to control
> registers on the STM32 F4 microcontroller, however I'm having trouble
> where GNAT is using byte loads/stores to the registers, instead of word
> load/stores (32-bit).

There is a middle way between assembly insertion and pure Ada. You could
try GCC's __sync_fetch_and_or and __sync_bool_compare_and_swap for atomic
load/store.

https://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Atomic-Builtins.html

> Things I have tried:
> 1) Using the Atomic aspect on the record type and CR object had no effect
> on the code generated.

Yes, I hope they will fix this for this and other platforms, e.g. 64-bit
atomic load/store for i686.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de