linux-kernel - Does Itanium permit speculative stores?

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Date:	Mon, 11 Nov 2013 09:13:08 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	tony.luck@...el.com
Cc:	peterz@...radead.org, linux-kernel@...r.kernel.org
Subject: Does Itanium permit speculative stores?

Hello, Tony,

Does Itanium permit speculative stores?  For example, on Itanium what are
the permitted outcomes of the following litmus test, where both x and y
are initially zero?

	CPU 0				CPU 1

	r1 = ACCESS_ONCE(x);		r2 = ACCESS_ONCE(y);
	if (r1)				if (r2)
		ACCESS_ONCE(y) = 1;		ACCESS_ONCE(x) = 1;

In particular, is the outcome (r1 == 1 && r2 == 1) possible on Itanium
given this litmus test?

							Thanx, Paul

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