tree 092a1f3d8da6fe618602199eb7af7a6f65aa1950
parent 383beda9cf32f795616c3b93f7d6154d70372d4b
author Richard Henderson <richard.henderson@linaro.org> 1534375907 -0700
committer Richard Henderson <richard.henderson@linaro.org> 1539917196 -0700

tcg: Split CONFIG_ATOMIC128

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.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>