21/03/2023 10:44, Joyce Kong: > Armv8.3 introduced a LDAPR instruction that has weaker guarantees, > just sufficient to implement memory_order_acq_rel. LDAPR does not > wait for previous STLR to complete. And if the same location is > used in both, it does not force the write to be globally observed. > The new instruction can avoid some costs associated with LDAR. > > GCC13.0 has supported LDAPR. > For Armv8.3 and higher, LDAPR is default. > For Armv8.2 such as neoverse n1, LDAPR is supported with enabling > rcpc feature. > For Armv8.1 and lower, LDAPR is not supported. > > Signed-off-by: Joyce Kong <joyce.k...@arm.com> > Reviewed-by: Ruifeng Wang <ruifeng.w...@arm.com>
Applied, thanks.
