From: Richard Guenther <richard.guenther@gmail.com>
To: Eric Botcazou <ebotcazou@adacore.com>
Cc: Duncan Sands <baldrick@free.fr>, gcc-patches@gcc.gnu.org
Subject: Re: [Ada] Fix bugs with volatile and components of aggregate types
Date: Mon, 20 Jun 2011 11:46:00 -0000 [thread overview]
Message-ID: <BANLkTi=GN56VEKg4UdQSZHrYGkHn5QJUiQ@mail.gmail.com> (raw)
In-Reply-To: <201106200124.49880.ebotcazou@adacore.com>
On Mon, Jun 20, 2011 at 1:24 AM, Eric Botcazou <ebotcazou@adacore.com> wrote:
>> if T is a non-volatile composite type with volatile components, and O is an
>> object of type T, are the optimizers allowed to remove the assignment "O :=
>> O"?
>
> Good question, that I'm not really qualified to answer. Any language lawyer?
Optimizers will test the TREE_THIS_VOLATILE flag on the expression
codes performing the load/store. So if O is not TREE_THIS_VOLATILE
they won't care. If frontends want something different in the above case
they have to make sure to properly set TREE_THIS_VOLATILE.
Richard.
> --
> Eric Botcazou
>
prev parent reply other threads:[~2011-06-20 11:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-18 13:01 Eric Botcazou
2011-06-19 18:01 ` Duncan Sands
2011-06-19 23:43 ` Eric Botcazou
2011-06-19 23:53 ` Mike Stump
2011-06-20 14:20 ` Michael Matz
2011-06-20 11:46 ` Richard Guenther [this message]
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