On Fri, Jul 15, 2011 at 12:02:06PM +0200, Paolo Bonzini wrote:
> On 07/15/2011 11:37 AM, Jakub Jelinek wrote:
> >While __sync_lock_test_and_set isn't a full barrier on all targets,
> >I hope it doesn't matter, because the inline caller has already done one
> >__sync_val_compare_and_swap which is a full barrier.
>
> Why not take the occasion to add the __sync_swap extension that
> clang added already?
I think Andrew and Aldy are already extending all the __sync_* builtins
to have extra argument with required barrier behavior bits for C++ memory
model.
Jakub
