Re: input constraints in atomic.h too loose ?

On 2/11/07, John David Anglin <[email protected]> wrote:
> > Did you want to test "=r" and change the two stw's to copy's?
>
> That won't work.  If these are global variables, you need the
> *address* of the variables in registers and to use stw %rX,0(%Y)
> instead of stw %rX,%Y.

They are not global. They are local variables which are the rvalue in
an assignment to something else.

e.g.
foo = atomic_compare_and_exchange_val_acquire (...);
foo = ({ ... ; lws_ret; })

c.