On Sun, May 13, 2007 at 07:26:13PM -0400, Bill Davidsen wrote:
> Krzysztof Halasa wrote:
> >Robert Hancock <[EMAIL PROTECTED]> writes:
> >>You don't need volatile in that case, rmb() can be used.
> >rmb() invalidates all compiler assumptions, it can be much slower.
It does not invalidate /all/ assumptions.
> Yes, why would you use rmb() when a read of a volatile generates optimal
> code?
Read of a volatile is guaranteed to generate the least optimal code.
That's what volatile does, guarantee no optimization of that particular
access.
Jeff
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