netdev - Re: NIU driver: Sun x8 Express Quad Gigabit Ethernet Adapter

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Message-Id: <20081112.142625.120012106.davem@davemloft.net>
Date:	Wed, 12 Nov 2008 14:26:25 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	jdb@...x.dk, netdev@...r.kernel.org
Subject: Re: NIU driver: Sun x8 Express Quad Gigabit Ethernet Adapter

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Wed, 12 Nov 2008 21:50:57 +0000

> See <http://c-faq.com/expr/seqpoints.html> if you're not convinced.

I don't think that has any implications for the piece of
code we are talking about.

Just google "C order of evaluation" and you will get hundreds
of tables, and all of them will have an entry for "|" (not
just "||") which says that operands are evaluated left to
right.

And since these MMIO reads are volatile operations, there is
no way the compiler can execute them out of order.

And the plain truth is that no compiler does, and that is what
matters in the end.
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