In-Reply-To: <[email protected]>
On Tue, 21 Feb 2006 at 08:38:04 -0800, Ulrich Drepper wrote:
> On 2/21/06, Chuck Ebbert <[email protected]> wrote:
> > > + : "=a" (oldval), "=m" (*uaddr)
> > ^^^^
> > Should be "+m" because it's both read and written.
>
> No, this is why there is the "0" input parameter.
But this is arg 1, not 0. With a memory clobber it's irrelevant
anyway though.
> > > + : "memory"
> > ^^^^^^^^
> > Is this necessary? Every possible memory location that could be
> > affected has been listed in the operands if the above change is made.
>
> This makes the asm a barrier for the compiler.
A comment to that effect would be nice; IOW document the reason for it.
--
Chuck
"Equations are the Devil's sentences." --Stephen Colbert
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