On Tue, Aug 21, 2018 at 07:27:00 -0700, Richard Henderson wrote:
(snip)
> +++ b/accel/tcg/atomic_template.h
(snip)
> +#else
> +/* Fallback definitions that must be optimized away, or error. */
> +Int128 __attribute__((error("unsupported atomic")))
> +atomic16_read(Int128 *ptr);
> +Int128 __att
GCC7+ will no longer advertise support for 16-byte __atomic operations
if only cmpxchg is supported, as for x86_64. Fortunately, x86_64 still
has support for __sync_compare_and_swap_16 and we can make use of that.
AArch64 does not have, nor ever has had such support, so open-code it.
Signed-off-b
